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Kumar, P., Thomas, J. P., Kharytonau, D. S., Gradone, A., Gilli, N., You, S., . . . Vomiero, A. (2025). Cadmium-free electron transport layers for hydrothermally processed semitransparent Sb2S3 solar cells. Nano Energy, 134, Article ID 110539.
Open this publication in new window or tab >>Cadmium-free electron transport layers for hydrothermally processed semitransparent Sb2S3 solar cells
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2025 (English)In: Nano Energy, ISSN 2211-2855, E-ISSN 2211-3282, Vol. 134, article id 110539Article in journal (Refereed) Published
Abstract [en]

Semitransparent thin film solar cells based on wide bandgap absorber Sb2S3 have immense potential in building integrated photovoltaic (BIPV) applications. A typical thin film Sb2S3 solar cell using low-cost solution-based methods (such as hydrothermal deposition) utilizes a toxic CdS film with a narrow bandgap (2.4 eV) as the electron transport layer (ETL). Wide bandgap (3.1–3.4 eV) non-toxic TiO2 meets the optoelectronic requirements for a Cd-free ETL alternative but the hydrothermal deposition of Sb2S3 on TiO2 results in a non-uniform island-like growth, which is unsuitable for semitransparent applications (utilizing less than 100 nm Sb2S3). Therefore, in this study, using the successive ionic layer adsorption and reaction (SILAR) method, an ultrathin ZnS layer (1–3 nm) is coated on TiO2 as a surface modification layer to improve the nucleation and growth characteristics of Sb2S3 during hydrothermal deposition. The introduction of ZnS results in a pinhole-free compact mirrorlike Sb2S3 film similar to that obtained on CdS. The optimized solar cells based on CdS, TiO2, and TiO2-ZnS ETLs showed photoconversion efficiencies (PCEs) of 5.2 %, 5.1 %, and 4.3 %, respectively. A comprehensive comparative study is then reported highlighting the relationship between morphology, optoelectronic properties, and photovoltaic performance of the Sb2S3 films grown on the three ETLs. Furthermore, utilizing the excellent film morphology of Sb2S3 on TiO2-ZnS ETL, semitransparent solar cells were fabricated using an ultrathin Au (<10 nm) electrode. Semitransparent solar cells using 65 and 80 nm Sb2S3 absorber layers on TiO2-ZnS obtained PCEs (and average visible transmittances, AVTs) of 3.3 % (11.2 %) and 3.6 % (8.8 %), respectively. These results are critical to the development of the BIPV sector through environmentally friendly and non-critical materials-based solutions.

Place, publisher, year, edition, pages
Elsevier, 2025
Keywords
Zinc Sulfide, Antimony Sulfide Solar Cells, Hydrothermal Deposition, Electron Transport layer Semitransparent Solar Cells, Average Visible Transmittance, Thin Film Solar Cells
National Category
Materials Chemistry
Research subject
Experimental Physics
Identifiers
urn:nbn:se:ltu:diva-111157 (URN)10.1016/j.nanoen.2024.110539 (DOI)2-s2.0-85211592986 (Scopus ID)
Funder
Knut and Alice Wallenberg FoundationThe Kempe FoundationsSwedish Research Council, 2022-05024
Note

Validerad;2024;Nivå 2;2025-01-01 (signyg);

Funder: For funding information, see: https://www.sciencedirect.com/science/article/pii/S2211285524012916?via%3Dihub#ack0005

Available from: 2024-12-30 Created: 2024-12-30 Last updated: 2025-02-04Bibliographically approved
Banari, M., Memarian, N., Kumar, P., You, S., Vomiero, A. & Concina, I. (2025). CeO2:ZnO hybrid nanorods for self-powered UV-photodetectors. Ceramics International, 51(1), 9-16
Open this publication in new window or tab >>CeO2:ZnO hybrid nanorods for self-powered UV-photodetectors
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2025 (English)In: Ceramics International, ISSN 0272-8842, E-ISSN 1873-3956, Vol. 51, no 1, p. 9-16Article in journal (Refereed) Published
Abstract [en]

In this study we present and discuss p-n heterostructures for photodetection. The hybrid structures consist of CeO2:ZnO-Cu2O, featuring different concentrations of CeO2, fabricated by using hydrothermal co-growth for CeO2 and ZnO, and sputtering deposition for Cu2O. As the concentration of CeO2 in the ZnO pristine nanorods was increased, the structural, optical and functional features of the materials showed relevant changes, in terms of crystalline domains and optical bandgap. After Cu2O deposition, the ternary materials were tested as UV photodectors, showing very good performance in terms of fast response and decay times. Specifically, we found that the CeO2:ZnO-Cu2O devices maintain a stable current under light irradiation, whose value was dependent on the CeO2 amount incorporated in the ZnO 1D nanostructures. Among all tested configurations, the 5.5 % hybrid CeO2:ZnO-Cu2O exhibits the highest current efficiency, accompanied by rapid rise and decay times. Our investigation suggests that the CeO2:ZnO-Cu2O configuration holds great potential for optoelectronic applications, particularly in the development of UV photodetectors.

Place, publisher, year, edition, pages
Elsevier Ltd, 2025
Keywords
CeO2 concentration, Band gap tunability, Hydrothermal reaction, Self-powered UV PDs, ZnO pencil-shaped
National Category
Materials Chemistry
Research subject
Experimental Physics
Identifiers
urn:nbn:se:ltu:diva-110796 (URN)10.1016/j.ceramint.2024.10.254 (DOI)2-s2.0-85209121451 (Scopus ID)
Note

Full text license: CC BY 4.0

Available from: 2024-11-25 Created: 2024-11-25 Last updated: 2025-01-17
Corvo Alguacil, M., Umeki, K., You, S. & Joffe, R. (2025). Evolution of carbon fiber properties during repetitive recycling via pyrolysis and partial oxidation. Carbon Trends, 18, Article ID 100438.
Open this publication in new window or tab >>Evolution of carbon fiber properties during repetitive recycling via pyrolysis and partial oxidation
2025 (English)In: Carbon Trends, E-ISSN 2667-0569, Vol. 18, article id 100438Article in journal (Refereed) Published
Abstract [en]

The potential of recycling carbon fiber reinforced polymers (CFRP) as a sustainable solution for waste management is yet to be fully understood. This study reports on the evolution of mechanical, and chemical properties of reclaimed carbon fibers when recycled multiple times via pyrolysis and partial oxidation. The performed work aims at filling the knowledge gap related to repetitive recycling when moving towards a circular flow of resources. A recycling process existing at industrial scale is used to ensure the relevance and usefulness of the results in the current industry scene. Two sets of three identical model composites are recycled using distinct recycling parameters, and their properties are characterized at the end of each recycling cycle. Results show that recycling can lead to an increase in stiffness but can have a negative impact on strength of recovered fibers. Mechanical behaviour shows recovered fibers suitable for secondary applications with medium performance requirements after two recycling cycles. The findings highlight the importance of understanding the material properties evolution during recycling processes. This research contributes to the development of sustainable waste management strategies and a more environmentally friendly future.

Place, publisher, year, edition, pages
Elsevier, 2025
Keywords
Pyrolysis, Carbon fiber, Composites recycling, CFRP, Polymer composites, Sustainability
National Category
Construction Management Environmental Management
Research subject
Energy Engineering; Experimental Physics; Polymeric Composite Materials
Identifiers
urn:nbn:se:ltu:diva-111158 (URN)10.1016/j.cartre.2024.100438 (DOI)2-s2.0-85211744749 (Scopus ID)
Note

Validerad;2024;Nivå 1;2025-01-01 (signyg);

Fulltext license: CC BY

Available from: 2024-12-30 Created: 2024-12-30 Last updated: 2025-02-10Bibliographically approved
Kumar, P., Eriksson, M., Kharytonau, D. S., You, S., Natile, M. M. & Vomiero, A. (2024). All-Inorganic Hydrothermally Processed Semitransparent Sb2S3 Solar Cells with CuSCN as the Hole Transport Layer. ACS Applied Energy Materials, 7(4), 1421-1432
Open this publication in new window or tab >>All-Inorganic Hydrothermally Processed Semitransparent Sb2S3 Solar Cells with CuSCN as the Hole Transport Layer
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2024 (English)In: ACS Applied Energy Materials, E-ISSN 2574-0962, Vol. 7, no 4, p. 1421-1432Article in journal (Refereed) Published
Abstract [en]

Published by American Chemical Society.An inorganic wide-bandgap hole transport layer (HTL), copper(I) thiocyanate (CuSCN), is employed in inorganic planar hydrothermally deposited Sb2S3 solar cells. With excellent hole transport properties and uniform compact morphology, the solution-processed CuSCN layer suppresses the leakage current and improves charge selectivity in an n-i-p-type solar cell structure. The device without the HTL (FTO/CdS/Sb2S3/Au) delivers a modest power conversion efficiency (PCE) of 1.54%, which increases to 2.46% with the introduction of CuSCN (FTO/CdS/Sb2S3/CuSCN/Au). This PCE is a significant improvement compared with the previous reports of planar Sb2S3 solar cells employing CuSCN. CuSCN is therefore a promising alternative to expensive and inherently unstable organic HTLs. In addition, CuSCN makes an excellent optically transparent (with average transmittance >90% in the visible region) and shunt-blocking HTL layer in pinhole-prone ultrathin(<100 nm) semitransparent absorber layers grown by green and facile hydrothermal deposition. A semitransparent device is fabricated using an ultrathin Au layer (∼10 nm) with a PCE of 2.13% and an average visible transmittance of 13.7%.

Place, publisher, year, edition, pages
American Chemical Society, 2024
Keywords
antimony sulfide solar cells, average visible transmittance, copper(I) thiocyanate, hole transport layer, hydrothermal deposition, semitransparent solar cells, thin film solar cells
National Category
Condensed Matter Physics
Research subject
Experimental Physics
Identifiers
urn:nbn:se:ltu:diva-104466 (URN)10.1021/acsaem.3c02492 (DOI)001163387300001 ()38425380 (PubMedID)2-s2.0-85184917687 (Scopus ID)
Funder
Swedish Research Council, 2022-05024Knut and Alice Wallenberg FoundationThe Kempe Foundations
Note

Validerad;2024;Nivå 2;2024-03-06 (hanlid);

Funder: European Union−Next Generation EU Award (PE0000021);

Full text license: CC BY

Available from: 2024-03-06 Created: 2024-03-06 Last updated: 2025-02-04Bibliographically approved
Corvo Alguacil, M., Umeki, K., Gaidukovs, S., Barkāne, A., You, S. & Joffe, R. (2024). The impact of thermal treatment parameters on the preservation of carbon fiber mechanical properties after reclamation. Current Research in Green and Sustainable Chemistry, 9, Article ID 100431.
Open this publication in new window or tab >>The impact of thermal treatment parameters on the preservation of carbon fiber mechanical properties after reclamation
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2024 (English)In: Current Research in Green and Sustainable Chemistry, E-ISSN 2666-0865, Vol. 9, article id 100431Article in journal (Refereed) Published
Abstract [en]

Carbon fiber, despite its exceptional properties, remains underutilized due to monetary and environmental concerns. Concurrently, the imminent challenge associated with rising quantities of End-of-Life CFRP (carbon fiber reinforced polymer) demands the further development of recycling strategies. This study focuses on optimizing the recycling process parameters of pyrolysis and oxidation thermal treatment to maximize the retention of mechanical properties in the recycled fibers in the shortest process time. To assess the result of the pyrolysis, single fiber tensile tests were executed to measure strength and stiffness. Additionally, microscopy and spectroscopy studies were carried out to evaluate fiber geometry as well as surface quality. At the laboratory scale, experiments demonstrated that the combination of pyrolysis and oxidation yields clean, reusable fibers with mechanical properties suitable for secondary applications. The influence of various treatment parameters on the strength and stiffness of the recycled fibers was explored, establishing a clear correlation. The outcome is a set of optimized parameters that contribute to mechanical property retention, including a novel recycling method that allows for reduced processing times, as short as 10 min. This work paves the way for a more eco-friendly and cost-effective approach to harnessing the potential of carbon fiber in a wide range of applications while mitigating environmental concerns associated with landfill disposal.

Place, publisher, year, edition, pages
Elsevier B.V., 2024
Keywords
Pyrolysis, Carbon fiber, Composite recycling, CFRP, Polymer composites, Sustainability
National Category
Materials Engineering Chemical Engineering
Research subject
Polymeric Composite Materials; Energy Engineering; Experimental Physics
Identifiers
urn:nbn:se:ltu:diva-110652 (URN)10.1016/j.crgsc.2024.100431 (DOI)2-s2.0-85207274252 (Scopus ID)
Note

Validerad;2024;Nivå 1;2024-11-26 (sarsun);

Full text license: CC BY 4.0;

Available from: 2024-11-06 Created: 2024-11-06 Last updated: 2024-11-26Bibliographically approved
Memarian, N., Farahi, E., Tobeiha, N., You, S. & Concina, I. (2024). Understanding Graphitic Carbon Nitride as Photocatalyst: A Case Study on Thermal Engineering of Physical and Chemical Features. Physica Status Solidi (a) applications and materials science, 221(7), Article ID 2300844.
Open this publication in new window or tab >>Understanding Graphitic Carbon Nitride as Photocatalyst: A Case Study on Thermal Engineering of Physical and Chemical Features
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2024 (English)In: Physica Status Solidi (a) applications and materials science, ISSN 1862-6300, E-ISSN 1862-6319, Vol. 221, no 7, article id 2300844Article in journal (Refereed) Published
Abstract [en]

Rationalizing material features according to the adopted synthetic strategy, aiming then to tune them on demand, is among the most relevant purposes of investigation in materials science. Herein, the systematic analysis of the dependence of graphitic carbon nitride (g-C3N4) physical characteristics on the decomposition temperature of urea, rationalizing the impact of synthetic temperature on several characteristics of the materials (degree of N–H condensation, carbon vs nitrogen content, structural parameters, photoluminescence lifetime, surface area, pores volume), is discussed. g-C3N4 nanostructures are fabricated by thermal decomposition of urea at different temperatures under ambient atmosphere, obtaining an almost ideal stoichiometry (C/N = 0.72) when setting the temperature at 600 °C. The samples show structural, textural, compositional, and optical differences directly depending on the fabrication temperature: specific surface area, pore volume and size, intralayer distance, and speed of radiative recombination of photogenerated charges are proportionally enhanced by increasing the synthesis temperature. The role played by all the physicochemical features of the prepared samples in promoting the catalytic degradation of Rhodamine B is investigated, highlighting their synergistic role in enhancing the catalytic efficiency. Significant differences in the dye degradation are recorded when using either UV or solar simulated light, demonstrating that Rhodamine B photosensitization rules the process.

Place, publisher, year, edition, pages
John Wiley & Sons, 2024
Keywords
g-C3N4, intralayer distance, photocatalysis, photoluminescence lifetime, urea thermal decomposition
National Category
Physical Chemistry Materials Chemistry
Research subject
Experimental Physics
Identifiers
urn:nbn:se:ltu:diva-104513 (URN)10.1002/pssa.202300844 (DOI)001163842100001 ()2-s2.0-85185129668 (Scopus ID)
Note

Validerad;2024;Nivå 2;2024-04-23 (joosat);

Full text license: CC BY-NC-ND

Available from: 2024-03-07 Created: 2024-03-07 Last updated: 2024-11-20Bibliographically approved
Kumar, P., You, S. & Vomiero, A. (2023). Recent Progress in Materials and Device Design for Semitransparent Photovoltaic Technologies. Advanced Energy Materials, 13(39), Article ID 2301555.
Open this publication in new window or tab >>Recent Progress in Materials and Device Design for Semitransparent Photovoltaic Technologies
2023 (English)In: Advanced Energy Materials, ISSN 1614-6832, E-ISSN 1614-6840, Vol. 13, no 39, article id 2301555Article, review/survey (Refereed) Published
Abstract [en]

Semitransparent photovoltaic (STPV) solar cells offer an immense opportunity to expand the scope of photovoltaics to special applications such as windows, facades, skylights, and so on. These new opportunities have encouraged researchers to develop STPVs using traditional thin-film solar cell technologies (amorphous-Si, CdTe, and CIGS or emerging solar cells (organic, perovskites, and dye-sensitized). There are considerable improvements in both power conversion efficiency (PCE) and semitransparency of these STPV devices. This review studies the device structure of state-of-the-art STPV devices and thereby analyzes the different approaches toward maximizing the product of PCE and average visible transmittance. The origins of PCE losses during the opaque-to-semitransparent transition in the different STPV technologies are discussed. In addition, critical practical aspects relevant to all STPV devices, such as compatibility of the top transparent electrode with the device structure, buffer layer optimization, light management engineering, scale-up, and stability, are also reported. This overview is expected to facilitate researchers across different technologies to identify and overcome the challenges toward achieving higher light utilization efficiencies in STPVs.

Place, publisher, year, edition, pages
John Wiley & Sons, 2023
Keywords
building integrated photovoltaics, semitransparent solar cells, transparent conductive electrodes, visible light transmittance
National Category
Materials Chemistry
Research subject
Experimental Physics
Identifiers
urn:nbn:se:ltu:diva-101570 (URN)10.1002/aenm.202301555 (DOI)001058884200001 ()2-s2.0-85169672434 (Scopus ID)
Funder
Knut and Alice Wallenberg FoundationThe Kempe Foundations
Note

Validerad;2023;Nivå 2;2023-11-09 (hanlid);

Full text license: CC BY

Available from: 2023-10-16 Created: 2023-10-16 Last updated: 2024-03-07Bibliographically approved
Taranova, A., Akbar, K., Yusupov, K., You, S., Polewczyk, V., Mauri, S., . . . Vomiero, A. (2023). Unraveling the optoelectronic properties of CoSbx intrinsic selective solar absorber towards high-temperature surfaces. Nature Communications, 14(1), Article ID 7280.
Open this publication in new window or tab >>Unraveling the optoelectronic properties of CoSbx intrinsic selective solar absorber towards high-temperature surfaces
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2023 (English)In: Nature Communications, E-ISSN 2041-1723, Vol. 14, no 1, article id 7280Article in journal (Refereed) Published
Abstract [en]

The combination of the ability to absorb most of the solar radiation and simultaneously suppress infrared re-radiation allows selective solar absorbers (SSAs) to maximize solar energy to heat conversion, which is critical to several advanced applications. The intrinsic spectral selective materials are rare in nature and only a few demonstrated complete solar absorption. Typically, intrinsic materials exhibit high performances when integrated into complex multilayered solar absorber systems due to their limited spectral selectivity and solar absorption. In this study, we propose CoSbx (2 < x < 3) as a new exceptionally efficient SSA. Here we demonstrate that the low bandgap nature of CoSbx endows broadband solar absorption (0.96) over the solar spectral range and simultaneous low emissivity (0.18) in the mid-infrared region, resulting in a remarkable intrinsic spectral solar selectivity of 5.3. Under 1 sun illumination, the heat concentrates on the surface of the CoSbx thin film, and an impressive temperature of 101.7 °C is reached, demonstrating the highest value among reported intrinsic SSAs. Furthermore, the CoSbx was tested for solar water evaporation achieving an evaporation rate of 1.4 kg m−2 h−1. This study could expand the use of narrow bandgap semiconductors as efficient intrinsic SSAs with high surface temperatures in solar applications.

Place, publisher, year, edition, pages
Springer Nature, 2023
National Category
Energy Engineering Atom and Molecular Physics and Optics
Research subject
Experimental Physics
Identifiers
urn:nbn:se:ltu:diva-102498 (URN)10.1038/s41467-023-42839-6 (DOI)001103647500019 ()37949914 (PubMedID)2-s2.0-85176459559 (Scopus ID)
Funder
The Kempe FoundationsKnut and Alice Wallenberg FoundationLuleå University of TechnologyEuropean Commission, No 881603, No 861857
Note

Validerad;2023;Nivå 2;2023-11-17 (joosat);

Funder: European Union - NextGenerationEU; Göran Gustafsson foundation;

CC BY 4.0 License;

For correction, see: Taranova, A., Akbar, K., Yusupov, K. et al. Author Correction: Unraveling the optoelectronic properties of CoSbx intrinsic selective solar absorber towards high-temperature surfaces. Nat Commun 15, 3548 (2024). https://doi.org/10.1038/s41467-024-47332-2

Available from: 2023-11-17 Created: 2023-11-17 Last updated: 2024-05-06Bibliographically approved
Kumar, P., You, S. & Vomiero, A. (2022). CuSCN as a hole transport layer in an inorganic solution-processed planar Sb2S3 solar cell, enabling carbon-based and semitransparent photovoltaics. Journal of Materials Chemistry C, 10(43), 16273-16282
Open this publication in new window or tab >>CuSCN as a hole transport layer in an inorganic solution-processed planar Sb2S3 solar cell, enabling carbon-based and semitransparent photovoltaics
2022 (English)In: Journal of Materials Chemistry C, ISSN 2050-7526, E-ISSN 2050-7534, Vol. 10, no 43, p. 16273-16282Article in journal (Refereed) Published
Abstract [en]

Sb2S3 is an emerging inorganic photovoltaic absorber material with attractive properties such as high absorption coefficient, stability, earth-abundance, non-toxicity, and low-temperature solution processability. Furthermore, with a bandgap of ca. 1.7 eV, it can also be used in semitransparent or tandem solar cell applications. Here, an inorganic wide-bandgap hole transport layer (HTL), copper thiocyanate (CuSCN), is used in an Sb2S3 solar cell employing a simple planar geometry. The compact and highly transparent CuSCN HTL was compatible with the low-cost, blade-coated carbon/Ag electrode and a semitransparent solar cell device. With Au and carbon/Ag electrodes, chemical bath deposited Sb2S3 solar cells achieved power conversion efficiencies (PCEs) of 1.75% and 1.95%, respectively. At the same time, a preliminary semitransparent Sb2S3 device with an ultrathin Au (similar to 15 nm) electrode showed a good average visible transmittance (AVT) of 26.7% at a PCE of 1.65%.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2022
National Category
Atom and Molecular Physics and Optics
Research subject
Experimental Physics
Identifiers
urn:nbn:se:ltu:diva-93960 (URN)10.1039/d2tc03420d (DOI)000870358700001 ()2-s2.0-85141036857 (Scopus ID)
Funder
Knut and Alice Wallenberg FoundationThe Kempe Foundations
Note

Validerad;2022;Nivå 2;2022-11-29 (marisr)

Available from: 2022-11-10 Created: 2022-11-10 Last updated: 2025-02-04Bibliographically approved
Cailotto, S., Massari, D., Gigli, M., Campalani, C., Bonini, M., You, S., . . . Crestini, C. (2022). N-Doped Carbon Dot Hydrogels from Brewing Waste for Photocatalytic Wastewater Treatment. ACS Omega, 7(5), 4052-4061
Open this publication in new window or tab >>N-Doped Carbon Dot Hydrogels from Brewing Waste for Photocatalytic Wastewater Treatment
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2022 (English)In: ACS Omega, E-ISSN 2470-1343, Vol. 7, no 5, p. 4052-4061Article in journal (Refereed) Published
Abstract [en]

The brewery industry annually produces huge amounts of byproducts that represent an underutilized, yet valuable, source of biobased compounds. In this contribution, the two major beer wastes, that is, spent grains and spent yeasts, have been transformed into carbon dots (CDs) by a simple, scalable, and ecofriendly hydrothermal approach. The prepared CDs have been characterized from the chemical, morphological, and optical points of view, highlighting a high level of N-doping, because of the chemical composition of the starting material rich in proteins, photoluminescence emission centered at 420 nm, and lifetime in the range of 5.5–7.5 ns. With the aim of producing a reusable catalytic system for wastewater treatment, CDs have been entrapped into a polyvinyl alcohol matrix and tested for their dye removal ability. The results demonstrate that methylene blue can be efficiently adsorbed from water solutions into the composite hydrogel and subsequently fully degraded by UV irradiation.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2022
National Category
Physical Chemistry Food Engineering
Research subject
Experimental Physics
Identifiers
urn:nbn:se:ltu:diva-89385 (URN)10.1021/acsomega.1c05403 (DOI)000757780800001 ()35155899 (PubMedID)2-s2.0-85124252978 (Scopus ID)
Funder
The Kempe FoundationsKnut and Alice Wallenberg Foundation
Note

Validerad;2022;Nivå 2;2022-02-23 (joosat);

Funder: Ca′ Foscari University (FPI2019)

Available from: 2022-02-23 Created: 2022-02-23 Last updated: 2022-04-07Bibliographically approved
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Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-7475-6394

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