Journal
FRONTIERS IN MATERIALS
Volume 8, Issue -, Pages -Publisher
FRONTIERS MEDIA SA
DOI: 10.3389/fmats.2021.682833
Keywords
lead-free perovskite; all-inorganic perovskite nanocrystals; photoluminescence quantum yield; ligand-assisted; stability
Categories
Funding
- State Key Laboratory of Nuclear Power Safety Monitoring Technology and Equipment [K-A2020.415]
- National Key Research and Development Program of China [2018YFE0125500, 2016YFB0401600]
- Program 111_2.0 in China [BP0719013]
- National Natural Science Foundation Project of China [61775034, 51879042, 61674029, 12005038]
- Research Fund for International Young Scientists [62050410350]
- International Cooperative Research Project of Jiangsu Province [BZ2018056]
- Leading Technology of Jiangsu Basic Research Plan [BK20192003]
- Natural Science Foundation of Jiangsu Province [BK20190774]
- Postgraduate Research and Practice Innovation Program of Jiangsu Province [KYCX19_0082]
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This study reports a facile method for synthesizing lead-free Cs3Cu2Cl5 NCs with high PLQY and good stability for optoelectronic devices. Furthermore, the composite films embedded with Cs3Cu2Cl5 NCs were found to greatly enhance the UV response of silicon photodetectors.
Zero-dimension (0-D) lead halide perovskite nanocrystals (NCs) have attracted a sight of interest in the field of optoelectronic devices due to their outstanding properties, such as high photoluminescence quantum yield (PLQY) and size- and composition-controlled tunable emission wavelengths. However, the toxicity of lead (Pb) element in the lead perovskite NCs is the bottleneck for the commercial application of perovskite NCs. Herein, we report a facile ligand-assisted synthesis to achieve lead-free Cs3Cu2Cl5 NCs with a high PLQY of similar to 70% and good stability against environmental oxygen/moisture as a promising down-conversion material. It has good merits of high PLQY and large Stokes shift (similar to 300 nm) originated from the effect of Jahn-Teller distortion and self-trapped excitons (STEs). Furthermore, the Cs3Cu2Cl5 NCs embedded composite films (NCCFs) were utilized to enhance the ultraviolet (UV) response of silicon (Si) photodetectors. External quantum efficiency (EQE) measurements show that the UV response can be greatly improved from 3.3 to 19.9% @ 295 nm based on NCCFs combined with Si photodiodes. Our work offers an effective approach to develop highly efficient and stable lead-free Cs3Cu2Cl5 NCs for the application in the solar-blind UV photodetector.
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