Enhanced performance of solar cells via anchoring CuGaS2quantum dots

Ternary I–III–VI quantum dots (QDs) of chalcopyrite semiconductors exhibit excellent optical properties in solar cells. In this study, ternary chalcopyrite CuGaS2nanocrystals (2–5 nm) were one-pot anchored on TiO2nanoparticles (TiO2@CGS) without any long ligand. The solar cell with TiO2@CuGaS2/N719 has a power conversion efficiency of 7.4%, which is 23% higher than that of monosensitized dye solar cell. Anchoring CuGaS2QDs on semiconductor nanoparticles to form QDs/dye co-sensitized solar cells is a promising and feasible approach to enhance light absorption, charge carrier generation as well as to facilitate electron injection comparing to conventional mono-dye sensitized solar cells. 三元I-III-VI族黄铜矿量子点作为太阳电池的敏化剂表现出优异的光学性质. 我们采用一步法将2-5纳米的三元黄铜矿CuGaS2量子点铆钉在TiO2纳米颗粒上, 不通过任何有机分子作为链接制备出了TiO2@CGS复合材料. 研究发现量子点和染料TiO2@CuGaS2/N719共敏化太阳电池效率达到7.4%, 相对于单敏化染料太阳电池而言,其电池效率提高了23%. CuGaS2量子点铆钉在半导体纳米颗粒增强了共敏化太阳电池的光吸收能力、 增加了电荷载流子数量, 促进了电子有效注入, 具有十分广阔的应用空间.