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Sodium-assisted passivation of grain boundaries and defects in Cu2ZnSnSe4 thin films

Title
Sodium-assisted passivation of grain boundaries and defects in Cu2ZnSnSe4 thin films
Authors
Kim, JuranKim, Gee YeongTrang, Thi Thu NguyenYoon, SeokhyunKim, Yoon-KooLee, Seung-YongKim, MiyoungCho, Dae-HyungChung, Yong-DuckLee, Je-HoSeong, Maeng-JeJo, William
Ewha Authors
조윌렴윤석현
SCOPUS Author ID
조윌렴scopus; 윤석현scopus
Issue Date
2020
Journal Title
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
ISSN
1463-9076JCR Link

1463-9084JCR Link
Citation
PHYSICAL CHEMISTRY CHEMICAL PHYSICS vol. 22, no. 14, pp. 7597 - 7605
Publisher
ROYAL SOC CHEMISTRY
Indexed
SCIE; SCOPUS WOS scopus
Document Type
Article
Abstract
The long stagnation of the photo-conversion efficiency of kesterites below 13% is a source of frustration in the scientific community. In this study, we investigated the effects of sodium on the passivation of grain boundaries and defects in Cu2ZnSnSe4 (CZTSe) grown on a soda-lime glass (SLG) and borosilicate (BS) glass. Because BS glass does not inherently contain sodium, we placed a thin layer of NaF between CZTSe and Mo. The composition of the samples is Cu-poor and Zn-rich. The distribution of sodium and its contributions to phase formation and defects were examined by cross-sectional energy-dispersive X-ray profiling, Raman scattering spectroscopy and imaging, surface potential and photoluminescence. From the experimental results, it can be strongly claimed that sodium ions segregate predominantly near the grain boundaries and reduce Cu-Zn-related defects. These local surface imaging analyses provided the exact locations of the secondary phases. In particular, the photo-assisted scanning probe method enabled us to observe the changes in the optoelectrical properties of the thin films and the carrier behavior within the materials. Further studies with distinct alkali ions and optimal processing conditions will pave a way to improve the performance of kesterite solar cells.
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DOI
10.1039/c9cp06537g
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자연과학대학 > 물리학전공 > Journal papers
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