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*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

69 Scopus citations

Abstract

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.

Original languageEnglish
Pages (from-to)2850-2857
Number of pages8
JournalNano letters
Volume19
Issue number5
DOIs
StatePublished - 8 May 2019

Keywords

  • Photoluminescence quantum yield
  • light out-coupling
  • perovskite
  • photodetector
  • quantum confinement

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