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학술지 Effects of Ga Concentration in Cu(In,Ga)Se2 Thin Film Solar Cells with a Sputtered-Zn(O,S) Buffer Layer
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저자
위재형, 조대형, 이우정, 한원석, 정용덕
발행일
201703
출처
Solar Energy, v.145, pp.59-65
ISSN
0038-092X
출판사
Elsevier
DOI
https://dx.doi.org/10.1016/j.solener.2016.08.054
협약과제
16PB2200, 초경량 유연 CIGS 박막 모듈 공정장비 상용화 기술개발, 정용덕
초록
Cu(In,Ga)Se2 absorbers with several different ratios of Ga/(Ga혻+혻In) were deposited by varying the Ga content using co-evaporation. The effects of Ga concentration at the surface of the CIGS on the Zn(O,S)/CIGS photovoltaic performance were investigated. Considering application as the bottom cell in a monolithic tandem structure, the optimum Ga/(Ga혻+혻In) ratio of approximately 0.26 led to the best efficiency of 14.56%, and to complete carrier collection at long wavelengths. In addition, the degradation rate in efficiency was lowest at an annealing temperature of 400혻°C. The reason for losses of other Ga/(Ga혻+혻In) ratios (0.33 and 0.36) at longer wavelengths might be due to interface recombination, possibly aided by conduction band offset with the Ga grading shape by varying the Ga concentration. The results suggested that the decrease in efficiency might be due to recombination at the interface between the Zn(O,S) and CIGS layers before/after annealing. The reverse bias effect during quantum efficiency measurements at long wavelengths was used to determine separate optical and electrical losses.
키워드
Bottom cell, Carrier collection, Cu(In,Ga)Se 2, Internal quantum efficiency, Zn(O,S)
KSP 제안 키워드
Annealing temperature, Buffer layer, Conduction band offset, Electrical loss, Ga concentration, Ga content, Ga grading, Interface recombination, Internal quantum efficiency, Reverse bias, Tandem structure