期刊
ACS ENERGY LETTERS
卷 2, 期 7, 页码 1479-1486出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.7b00375
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资金
- National Nature Science Foundation of China [61674098]
- China Postdoctoral Science Foundation [2016M602759]
- National Key Research Program of China [2016YFA0202403]
- National University Research Fund [GK261001009, GK20170302, GK201603107]
- Innovative Research Team [IRT_14R33]
- Chinese National 1000-talent-plan program [111001034]
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 (similar to 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/cm(2) 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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