期刊
NANO LETTERS
卷 19, 期 5, 页码 2850-2857出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.8b04887
关键词
Photoluminescence quantum yield; quantum confinement; perovskite; light out-coupling; photodetector
类别
资金
- National Natural Science Foundation of China [51672231]
- General Research Fund from the Hong Kong Research Grant Council [612113, 16237816]
- Center for 1D/2D Quantum Materials
- Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division of the U.S. Department of Energy [DE-AC02-05Ch11231]
- State Key Laboratory on Advanced Displays and Optoelectronics at HKUST
High-photoluminescence quantum yield (PLQY) is required to reach optimal performance in solar cells, lasers, and light-emitting diodes (LEDs). Typically, PLQY can be increased by improving the material quality to reduce the nonradiative recombination rate. It is in principle equally effective to improve the optical design by nano-structuring a material to increase light out-coupling efficiency (OCE) and introduce quantum confinement, both of which can increase the radiative recombination rate. However, increased surface recombination typically minimizes nanostructure gains in PLQY. Here a template-guided vapor phase growth of CH3NH3PbI3 (MAPbI(3)) nanowire (NW) arrays with unprecedented control of NW diameter from the bulk (250 nm) to the quantum confined regime (5.7 nm) is demonstrated, while simultaneously providing a low surface recombination velocity of 18 cm s(-1). This enables a 56-fold increase in the internal PLQY, from 0.81% to 45.1%, and a 2.3-fold increase in OCEy to increase the external PLQY by a factor of 130, from 0.33% up to 42.6%, exclusively using nanophotonic design.
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