The role of ZnO-coating-layer thickness on the recombination in CdS quantum-dot-sensitized solar cells

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• 作者：Hongsik Choi ; Jongmin Kim ; Changwoo Nahm ; Chohui Kim ; Seunghoon Nam ; Joonhyeon Kang ; Byungho Lee ; Taehyun Hwang ; Suji Kang ; Dong Joo Choi ; Young-Ho Kim ; Byungwoo Park
• 关键词：Quantum-dot-sensitized solar cells ; Cadmium sulfide ; Coating ; Zinc oxide ; Solar cells
• 刊名：Nano Energy
• 出版年：November, 2013
• 年：2013
• 卷：2
• 期：6
• 页码：1218-1224
• 全文大小：3526 K

文摘

To prevent recombination at the interface of TiO₂/polysulfide-electrolyte, a ZnO layer was deposited on a TiO₂ electrode. The optimized ZnO-coated solar cell exhibited a 鈭?2% increase in the power-conversion efficiency compared to the bare cell. The coating layer acts as an energy barrier, which plays an important role in reducing the charge recombination from the TiO₂ electrode to the electrolyte. Moreover, CdS quantum-dot adsorption was enhanced by employing the ZnO-coated layer. The thicker ZnO layer (more than 8-cycle deposition), however, led to a less porous electrode, as confirmed by electrolyte diffusivity, and also deteriorated the cell efficiency by introducing defect states verified by electron lifetime and chronoamperometric reduction current.