Slow Auger Recombination of Charged Excitons in Nonblinking Perovskite Nanocrystals without Spectral Diffusion

Fengrui Hu; Chunyang Yin; Huichao Zhang; Chun Sun; William W Yu; Chunfeng Zhang; Xiaoyong Wang; Yu Zhang; Min Xiao

doi:10.1021/acs.nanolett.6b02874

Slow Auger Recombination of Charged Excitons in Nonblinking Perovskite Nanocrystals without Spectral Diffusion

Nano Lett. 2016 Oct 12;16(10):6425-6430. doi: 10.1021/acs.nanolett.6b02874. Epub 2016 Oct 4.

Authors

Fengrui Hu¹, Chunyang Yin¹, Huichao Zhang^{1

2}, Chun Sun³, William W Yu³, Chunfeng Zhang¹, Xiaoyong Wang¹, Yu Zhang³, Min Xiao^{1

4}

Affiliations

¹ National Laboratory of Solid State Microstructures, School of Physics, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University , Nanjing 210093, China.
² College of Electronics and Information, Hangzhou Dianzi University , Xiasha Campus, Hangzhou 310018, China.
³ State Key Laboratory on Integrated Optoelectronics and College of Electronic Science and Engineering, Jilin University , Changchun 130012, China.
⁴ Department of Physics, University of Arkansas , Fayetteville, Arkansas 72701, United States.

PMID: 27689439
DOI: 10.1021/acs.nanolett.6b02874

Abstract

Over the last two decades, intensive research efforts have been devoted to the suppressions of photoluminescence (PL) blinking and Auger recombination in metal-chalcogenide nanocrystals (NCs), with significant progresses being made only very recently in few specific NC structures. Here we show that nonblinking PL is readily available in the newly synthesized perovskite CsPbI₃ NCs and that their Auger recombination of charged excitons is greatly slowed down, as signified by a PL lifetime about twice shorter than that of neutral excitons. Moreover, spectral diffusion is completely absent in single CsPbI₃ NCs at the cryogenic temperature, leading to a resolution-limited PL line width of ∼200 μeV.

Keywords: Auger recombination; Perovskite; blinking; nanocrystal; spectral diffusion.