期刊
NANO ENERGY
卷 46, 期 -, 页码 45-53出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2018.01.035
关键词
Perovskite solar cells; CdTe; Quantum dots; Ligand exchange; Hysteresis
类别
资金
- National Natural Science Foundation of China [21701009, 51673025]
- National Key Research and Development Program of China [2016YFB0700700]
- Young Talent Thousand Program
- NSFC [51627803]
Solar cells employing lead halide perovskites as light absorbers have been one hot topic in recent years due to their amazing device performance and commercialization potential. Yet, there exist challenges on the way to their practical use, including long-term stability, and J-V hysteresis. Herein, we demonstrate an improved contact between perovskite and hole transporting layer (HTL) by using CdTe quantum dots, wherein the capping ligands on quantum dots are systematically investigated. The devices with the CdTe quantum-dot-in-perovskite solids interlayer achieve a high efficiency (similar to 19.3%, averaged), and more importantly, a significantly reduced hysteresis, which is superior to devices with CdTe QDs capped by other ligands (PbI2, CH3NH3I, oleic acid). We attribute this superior device performance to the congeneric junction contact between perovskite and CdTe quantum-dot-in-perovskite layer. Furthermore, we reveal that the reduced hysteresis is partially contributed from faster hole extraction at the interface thanks to the high hole mobility in CdTe. These findings shed lights on the future design of quantum dots for perovskite optoelectronics in the perspective of ligand engineering.
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