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Cu2ZnSn(S,Se)4 Solar Cell Absorbers from Diffusion of Selenium into Annealed Cu2ZnSnS4 Absorbers
Univ Oslo, N-0316 Oslo, Norway..
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics.
Univ Oslo, N-0316 Oslo, Norway..
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics.
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2016 (English)In: 2016 IEEE 43rd Photovoltaic Specialists Conference (PVSC), New York: IEEE, 2016, 492-497 p.Conference paper, Published paper (Refereed)
Abstract [en]

Small grain compound-sputtered Copper Zinc Tin Sulfide (CZTS) precursors and large grain recrystallized CZTS solar cell absorbers are annealed at sub-recrystallization temperatures in selenium atmosphere to promote selenium diffusion into the CZTS films. Grazing incidence x-ray diffraction and Raman spectroscopy show the presence of two distinct sulfide and mixed sulfide/selenide phases, with the selenide-like phase more prominent at the front surface of the absorber. Only a narrow range of sulfur-to-selenium ratios is observed in the sulfide/selenide phase. Secondary ion mass spectrometry profiles show a compositional sulfur-selenium gradient for samples annealed at 450 degrees C. Scanning electron microscopy with energy dispersive X-ray spectroscopy reveals that the compositional gradient is formed by a spatial distribution of sulfide/selenide grains, embedded in the remaining sulfide absorber. Sulfur-selenium gradients within single absorber grains are not observed, indicating that the mixed sulfide/selenide phase nucleates and grows in competition with the existing sulfide phase, rather than forming by replacement of anions within existing crystals. IV and EQE measurements of devices fabricated from the selenized absorbers support this conclusion.

Place, publisher, year, edition, pages
New York: IEEE, 2016. 492-497 p.
Series
IEEE Photovoltaic Specialists Conference, ISSN 0160-8371
Keyword [en]
CZTSSe, diffusion, gradient
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-331387DOI: 10.1109/PVSC.2016.7749643ISI: 000399818700108ISBN: 978-1-5090-2724-8 (electronic)OAI: oai:DiVA.org:uu-331387DiVA: diva2:1149473
Conference
43rd IEEE Photovoltaic Specialists Conference (PVSC), JUN 05-10, 2016, Portland, OR
Funder
Swedish Foundation for Strategic Research Knut and Alice Wallenberg Foundation, Wallenberg Academy Fellows program
Note

Title in WoS: Cu2ZnSn(S,Se)(4) Solar Cell Absorbers from Diffusion of Selenium into Annealed Cu2ZnSnS4 Absorbers

Available from: 2017-10-16 Created: 2017-10-16 Last updated: 2017-10-16Bibliographically approved

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Larsen, Jes KSärhammar, ErikPlatzer Björkman, Charlotte

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