Increasing Photoluminescence Quantum Yield by Nanophotonic Design of Quantum-Confined Halide Perovskite Nanowire Arrays

Daquan Zhang, Leilei Gu, Qianpeng Zhang, Yuanjing Lin, Der-Hsien Lien, Matthew Kam, Swapnadeep Poddar, Erik C. Garnett, Ali Javey, Zhiyong Fan*

*此作品的通信作者

研究成果: Article同行評審

70 引文 斯高帕斯(Scopus)

摘要

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 nanostructuring 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 CH 3 NH 3 PbI 3 (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.

原文English
頁(從 - 到)2850-2857
頁數8
期刊Nano letters
19
發行號5
DOIs
出版狀態Published - 8 5月 2019

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