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학술지 Unraveling Interface Characteristics of Zn(O,S)/Cu(In,Ga)Se2 at Nanoscale: Enhanced Hole Transport by Tuning Band Offsets
Cited 0 time in scopus
저자
김주란, 김자영, 고은지, 박하경, 윤석현, 조대형, 이우정, 정용덕, 조윌렴
발행일
202004
출처
Applied Surface Science, v.509, pp.1-6
ISSN
0169-4332
출판사
Elsevier
DOI
https://dx.doi.org/10.1016/j.apsusc.2019.144782
협약과제
19JB1900, 무독성 버퍼층을 갖는 다색 플렉서블 박막 태양전지 기술 개발, 정용덕
초록
© 2019 Environment-friendly Cu(In,Ga)Se2 (CIGS) solar cells requires the replacement of Cd-containing buffers with non-toxic materials. Zn(O,S) buffers have been developed and yielded even better efficiency than CdS-buffered CIGS thin-film solar cells [23.35%, Ref. [6]]. In this work, we studied band offsets of Zn(O,S) and CIGS interfaces. The Cd-free buffer layers were deposited with 1.0%, 1.3%, and 1.6% oxygen (O2) gas partial pressure during the deposition. Effects of the oxygen partial pressure on the structure and electronic properties of the devices were investigated by micro-Raman scattering spectroscopy and Kelvin probe force microscopy, respectively. We achieved depth-profiling of spatial work function mapping across the interface between the absorbers and the buffers. The best efficiency sample, grown using 1.3% of oxygen, showed 80 mV spike-like band offsets. We propose that the efficiency can be improved through tailoring of the band offsets at the interface as well as improving the absorber and the buffer materials.
키워드
Cu(In, Ga)Se thin-film solar cells 2, Kelvin probe force microscopy (KPFM), Micro-Raman scattering spectroscopy, Zn(O,S) buffer layer
KSP 제안 키워드
Buffer material, Cd-free buffer layer, Depth profiling(DP), Environment-friendly, Function mapping, Hole transport, Interface characteristics, Kelvin Probe force microscopy, Micro-Raman scattering spectroscopy, Raman scattering(SERS), Structure and electronic properties