| 학회 |
한국재료학회 |
| 학술대회 |
2017년 봄 (05/17 ~ 05/19, 목포 현대호텔) |
| 권호 |
23권 1호 |
| 발표분야 |
C. 에너지 재료 분과 |
| 제목 |
Tailoring photoelectrochemical performance and stability of Cu(In,Ga)Se2 photocathode with TiO2-coupled buffer layers |
| 초록 |
Photoelectrochemical (PEC) water splitting is an eco-friendly way of conversting solar energy to storable form of useful chemical fuels such as hydrogen and oxygen. An overall solar-to-fuel conversion efficiency is depends on band position of light absorbing semiconductor photoelectrode. Among semiconductor materials, quaternary compound, Cu(In,Ga)Se2 (CIGS) is a promising photoelectrode given its succesful application in high-efficiency thin film photovoltaics. Here, we investigated PEC performance and stabilty of CIGS photocathode for hydrogen evolution. Various buffer layers such as CdS, ZnxSnyOz, TiO2, and a combination of the aforementioned, were applied on the CIGS photocathode not only to facilitate charge separation and transport, but also to protect the CIGS from an aqueous electrolyte. A multilayered CIGS/CdS/TiO2/Pt showed best current-potential characteristics and power-saved efficiency of 2.6 % among tested photocathodes. However, it was found that the stability of CIGS photocathode with a TiO2-coupled metal-oxide overlayer such as ZnxSnyOz was better than those with a CdS/TiO2, suggesting that the stability of CIGS photocathodes can be influenced by the TiO2 residing on n-type buffer layers. Detailed analysis will be discussed. |
| 저자 |
구본형1, 남성욱2, Richard Haight3, 김선철1, 오승택1, 조민형1, 오지훈1, 이정용1, 안병태4, 신병하1
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| 소속 |
1KAIST, 2경북대, 3IBM T. J. Watson Research center, 4IBS |
| 키워드 |
Cu(In; Ga)Se<SUB>2</SUB> photocathode; photoelectrochemical water splitting; TiO<SUP>2</SUP> protection layer; buffer layer
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| E-Mail |
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