Aqueous-Processed Inorganic Thin-Film Solar Cells Based on CdSexTe1鈥搙 Nanocrystals: The Impact of Composition on Photovoltaic Performance

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• 作者：Qingsen Zeng ; Zhaolai Chen ; Yue Zhao ; Xiaohang Du ; Fangyuan Liu ; Gan Jin ; Fengxia Dong ; Hao Zhang ; Bai Yang
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：October 21, 2015
• 年：2015
• 卷：7
• 期：41
• 页码：23223-23230
• 全文大小：582K
• ISSN：1944-8252

文摘

Aqueous processed nanocrystal (NC) solar cells are attractive due to their environmental friendliness and cost effectiveness. Controlling the bandgap of absorbing layers is critical for achieving high efficiency for single and multijunction solar cells. Herein, we tune the bandgap of CdTe through the incorporation of Se via aqueous process. The photovoltaic performance of aqueous CdSe_xTe_1鈥?i>x NCs is systematically investigated, and the impacts of charge generation, transport, and injection on device performance for different compositions are deeply discussed. We discover that the performance degrades with the increasing Se content from CdTe to CdSe. This is mainly ascribed to the lower conduction band (CB) of CdSe_xTe_1鈥?i>x with higher Se content, which reduces the driving force for electron injection into TiO₂. Finally, the performance is improved by mixing CdSe_xTe_1鈥?i>x NCs with conjugated polymer poly(p-phenylenevinylene) (PPV), and power conversion efficiency (PCE) of 3.35% is achieved based on ternary NCs. This work may provide some information to further optimize the aqueous-processed NC and hybrid solar cells.