Characterization of Interface Between Accurately Controlled Cu‐Deficient Layer and Cu(In,Ga)Se<subscript>2</subscript> Absorber for Cu(In,Ga)Se<subscript>2</subscript> Solar Cells.
In: Physica Status Solidi - Rapid Research Letters, Jg. 12 (2018-08-01), Heft 8, S. 1-5
Online
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Zugriff:
We recently succeeded in controlling a Cu‐deficient Cu(In,Ga)Se 2 layer (CDL) on a Cu(In,Ga)Se 2 (CIGS) surface by introducing an Se irradiation after the completion of the second stage in a three‐stage process during CIGS growth. The CDL on the surface causes the formation of a valence band offset (ΔE V ) between the CDL and CIGS because the Cu vacancies decrease the valence band maximum of the CDL. Therefore, we can expect the suppression of recombination at the CdS/CIGS interface in CIGS solar cells due to the repelling of holes by ΔE V . The amount of knowledge regarding the properties of CDL/CIGS interfaces is observed to be quite small because a control technique for CDL has not been developed so far. In this study, the compositional and structural properties of an accurately controlled CDL/CIGS interface are investigated in detail. The composition of the interface between the CDL and CIGS is observed using an energy dispersive X‐ray spectroscopy with the help of a transmission electron microscope. Using nanobeam electron diffraction and Fourier transfer mapping analysis, it is confirmed that the ( 1 1 ¯ 2 ) plane in the CDL continuously grows on the ( 11 2 ¯ ) plane in CIGS. Further, these results indicate that a high‐quality interface is formed between the CDL and CIGS, which contains only a small amount of dangling bonds. Finally, a high conversion efficiency of 19.4% is achieved in the CIGS solar cell, which can be attributed to the formation of CDL and effect of ΔE V . [ABSTRACT FROM AUTHOR]
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Titel: |
Characterization of Interface Between Accurately Controlled Cu‐Deficient Layer and Cu(In,Ga)Se<subscript>2</subscript> Absorber for Cu(In,Ga)Se<subscript>2</subscript> Solar Cells.
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Autor/in / Beteiligte Person: | Nishimura, Takahito ; Sugiura, Hiroki ; Nakada, Kazuyoshi ; Yamada, Akira |
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Zeitschrift: | Physica Status Solidi - Rapid Research Letters, Jg. 12 (2018-08-01), Heft 8, S. 1-5 |
Veröffentlichung: | 2018 |
Medientyp: | academicJournal |
ISSN: | 1862-6254 (print) |
DOI: | 10.1002/pssr.201800129 |
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