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New Concept of Highly Efficient Dye-Sensitized Solar Cells

2009년 8월 7일 16시 07분 09초
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공업화학 - Dye-Sensitized and Organic Solar Cells
저자 및
고재중, 김점종, 김덕현, 최현봉, 김철우, 백상현, 조나라
고려대학교 소재화학과, Korea

Dye-sensitized nanocrystalline TiO2 solar cells (DSSCs) have attracted considerable interest because of their high conversion of sunlight to electricity and easy fabrication. To overcome the prohibitive cost of ruthenium metal complexes, several groups have developed metal free sensitizers and obtained efficiencies in the range of 8~9%. However, a major issue for the low photoconversion efficiency of many organic dyes in dye-sensitized solar cell is due to the formation of dye aggregates on the semiconductor surface. Therefore, for obtaining efficient photoconversion based on organic dyes, aggregation needs to be avoided through the CD(cyclodextrin). An optimal sensitizers, which combine broad visible light absorption with an excited-state directionality for favorable electron-transfer dynamics, is a key issue in the development of DSSC. So, we used a two type concept. First is the novel cosensitization based on the controlled construction of the film architecture in which a primary monolayer of dye is spatially separated from a secondary monolayer of another dye suing a layer of Al2O3, resulting in the configuration TiO2/Dye1/Al2O3/Dye2. Second concept, a tandem-structured dye sensitized solar cell composed of a front and a back sub-cells was assembled by using spectrally complementary organic dye combinations. Other issue is that The photovoltaic performance of the quantum dot-sensitized solar cells (QDSCs) was still much lower than that obtained from DSSCs. In particular, IPCE values of QDSCs were at a low level of 60%. The serious electron loss due to a charge recombination at TiO2/CdSe interface. In order to solve these issue, we proposed a new route to assemble CdSe QDs onto TiO2 films in this study. It includes four main steps: seed-sowing, seed-growing, ZnS-covering, and post-sintering. Through this route, superior electrodes with an enhanced performance of the device were achieved.