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Carbon quantum dots improving photovoltaic performance of CdS quantum dot-sensitized solar cells
Optical Materials ( IF 3.9 ) Pub Date : 2020-12-01 , DOI: 10.1016/j.optmat.2020.110535
Ping Huang , Shunjian Xu , Meng Zhang , Wei Zhong , Zonghu Xiao , Yongping Luo

Abstract N-doped carbon quantum dots (CQDs) are introduced into CdS quantum dot-sensitized solar cells (QDSCs) to improve the photovoltaic performance. The fluorescent CQDs with average diameter of 2.97 ± 0.4 nm are prepared using cotton fiber as carbon precursor and urea as dopant by hydrothermal method. The power conversion efficiency (PCE) of CQDs/CdS based QDSCs is 0.606%, which is 40.9% higher than that of CdS based QDSCs (0.430%). There are three reasons for this improvement: (1) the CQDs broaden the absorption range and enhance the absorption intensity of the sensitized photoanode; (2) the CQDs effectively reduce the charge recombination between the photoanode and electrolyte interface in the QDSCs; (3) the CdS quantum dots (QDs) and CQDs are probably forming a band alignment of type I, which makes the LUMO descend from CdS QDs to TiO2 through CQDs.

中文翻译:

碳量子点提高 CdS 量子点敏化太阳能电池的光伏性能

摘要 N掺杂碳量子点(CQDs)被引入到CdS量子点敏化太阳能电池(QDSCs)中以提高光伏性能。以棉纤维为碳前驱体,尿素为掺杂剂,通过水热法制备了平均直径为 2.97±0.4 nm 的荧光 CQD。CQDs/CdS基QDSCs的功率转换效率(PCE)为0.606%,比CdS基QDSCs(0.430%)高40.9%。这种改进有三个原因:(1)CQDs 拓宽了吸收范围并增强了敏化光阳极的吸收强度;(2) CQDs有效地减少了QDSCs中光阳极和电解质界面之间的电荷复合;(3) CdS 量子点 (QDs) 和 CQDs 可能形成 I 型带排列,
更新日期:2020-12-01
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