Aqueous-Processed Inorganic Thin-Film Solar Cells Based on CdSexTe1-x Nanocrystals: The Impact of Composition on Photovoltaic Performance.
Aqueous-Processed Inorganic Thin-Film Solar Cells Based on CdSexTe1-x Nanocrystals: The Impact of Composition on Photovoltaic Performance.
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基于 CdSexTe1-x 纳米晶体的水处理无机薄膜太阳能电池：成分对光伏性能的影响。
DOI：
10.1021/acsami.5b07197
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Yang Bai
中科院分区：
文献类型：
--
作者：
Zeng Qingsen;Chen Zhaolai;Zhao Yue;Du Xiaohang;Liu Fangyuan;Jin Gan;Dong Fengxia;Zhang Hao;Yang Bai
水处理纳米晶体（NC）太阳能电池因其环境友好性和成本效益而颇具吸引力。控制吸收层的带隙对于实现单结和多结太阳能电池的高效率至关重要。在这里，我们通过水相过程掺入 Se 来调节 CdTe 的带隙。系统地研究了水性 CdSexTe1-xNCs 的光伏性能，并深入讨论了不同成分的电荷产生、传输和注入对器件性能的影响。我们发现，从 CdTe 到 CdSe，性能随着 Se 含量的增加而降低。这主要是由于 Se 含量较高的 CdSexTe1-x 的导带 (CB) 较低，从而降低了电子注入 TiO2 的驱动力。最后，通过将CdSexTe1-xNCs与共轭聚合物聚对亚苯基亚乙烯基（PPV）混合来提高性能，基于三元NCs实现了3.35%的功率转换效率（PCE）。这项工作可以为进一步优化水处理NC和混合太阳能电池提供一些信息。
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 CdSexTe1–xNCs 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 CdSexTe1–xwith higher Se content, which reduces the driving force for electron injection into TiO2. Finally, the performance is improved by mixing CdSexTe1–xNCs 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.