能量转换效率
钙钛矿(结构)
量子点
材料科学
光电子学
紫外线
量子效率
钙钛矿太阳能电池
图层(电子)
量子产额
光伏系统
纳米技术
化学工程
光学
物理
工程类
生态学
荧光
生物
作者
Qian Wang,Xisheng Zhang,Zhiwen Jin,Jingru Zhang,Zhenfei Gao,Yongfang Li,Shengzhong Liu
出处
期刊:ACS energy letters
[American Chemical Society]
日期:2017-06-01
卷期号:2 (7): 1479-1486
被引量:214
标识
DOI:10.1021/acsenergylett.7b00375
摘要
Parasitic absorption by window layer, electrode layer, and interface layer in the near ultraviolet (UV) region is no longer negligible for high-efficiency perovskite solar cells. On the other hand, UV-induced degradation is also a big component of cell instability. Herein, CsPbCl3:Mn-based quantum dots (QDs) are synthesized and applied onto the front side of the perovskite solar cells as the energy-down-shift (EDS) layer. It is found that with very high quantum yield (∼60%) and larger Stokes shift (>200 nm), the CsPbCl3:Mn QDs effectively convert the normally wasted energy in the UV region (300–400 nm) into usable visible light at ∼590 nm for enhanced power conversion efficiency (PCE). Meanwhile, conversion of the UV rays eliminated a significant loss mechanism that deteriorates perovskite stability. As a result, external quantum efficiency in the UV region is significantly increased, leading to an increased short-circuit current (3.77%) and PCE (3.34%). Furthermore, the stability of perovskite solar cells has also been improved from 85% to 97% of their initial efficiency after exposure in the UV region with 5 mW/cm2 intensity by 100 h. In parallel, the organic and silicon solar cells coated by EDS QDs also both confirm the above conclusion with PCE enhancements of 3.21% and 2.98%, respectively. These results suggest that the CsPbCl3:Mn QDs play a significant role in improving the efficiency and stability of photovoltaic devices. To our knowledge, this is the first report about CsPbCl3:Mn QD-assisted perovskite solar cells.
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