Comprehensive defect suppression in perovskite nanocrystals for high-efficiency light-emitting diodes

Kim, Young-Hoon; Kim, Sungjin; Kakekhani, Arvin; Park, Jinwoo; Park, Jaehyeok; Lee, Yong-Hee; Xu, Hengxing; Nagane, Satyawan; Wexler, Robert B.; Kim, Dong-Hyeok; Jo, Seung Hyeon; Martínez-Sarti, Laura; Tan, Peng; Sadhanala, Aditya; Park, Gyeong-Su; Kim, Young-Woon; Hu, Bin; Bolink, Henk J.; Yoo, Seunghyup; Friend, Richard H.; Rappe, Andrew M.; Lee, Tae-Woo

doi:10.1038/s41566-020-00732-4

Title: Comprehensive defect suppression in perovskite nanocrystals for high-efficiency light-emitting diodes

Journal Article · Mon Jan 04 00:00:00 EST 2021 · Nature Photonics

DOI:https://doi.org/10.1038/s41566-020-00732-4· OSTI ID:1866724

^[1]; Kim, Sungjin ^[1];

^[2];

^[1];

^[3]; Lee, Yong-Hee ^[1]; Xu, Hengxing ^[4]; Nagane, Satyawan ^[5];

^[2]; Kim, Dong-Hyeok ^[1]; Jo, Seung Hyeon ^[1];

^[6];

^[7]; Sadhanala, Aditya ^[8]; Park, Gyeong-Su ^[1]; Kim, Young-Woon ^[1];

^[4];

^[6]; Yoo, Seunghyup ^[3];

^[5] more »

Seoul National Univ. (Korea, Republic of)
Univ. of Pennsylvania, Philadelphia, PA (United States)
Korea Advanced Inst. Science and Technology (KAIST), Daejeon (Korea, Republic of)
Univ. of Tennessee, Knoxville, TN (United States)
Univ. of Cambridge (United Kingdom)
Univ. of Valencia (Spain)
Univ. of Pennsylvania, Philadelphia, PA (United States); Harbin Institute of Technology (China)
Univ. of Cambridge (United Kingdom); Univ. of Oxford (United Kingdom)

Electroluminescence efficiencies of metal halide perovskite nanocrystals (PNCs) are limited by a lack of material strategies that can both suppress the formation of defects and enhance the charge carrier confinement. Here we report a one-dopant alloying strategy that generates smaller, monodisperse colloidal particles (confining electrons and holes, and boosting radiative recombination) with fewer surface defects (reducing non-radiative recombination). Doping of guanidinium into formamidinium lead bromide PNCs yields limited bulk solubility while creating an entropy-stabilized phase in the PNCs and leading to smaller PNCs with more carrier confinement. Further, the extra guanidinium segregates to the surface and stabilizes the undercoordinated sites. Furthermore, a surface-stabilizing 1,3,5-tris(bromomethyl)-2,4,6-triethylbenzene was applied as a bromide vacancy healing agent. The result is highly efficient PNC-based light-emitting diodes that have current efficiency of 108 cd A^–1 (external quantum efficiency of 23.4%), which rises to 205 cd A^–1 (external quantum efficiency of 45.5%) with a hemispherical lens.

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Research Organization:: Univ. of Pennsylvania, Philadelphia, PA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; National Research Foundation of Korea (NRF); Chinese Scholarship Council (CSC); European Research Council (ERC); Ministry of Economic Affairs and Digital Transformation of Spain (MINECO)

Grant/Contract Number:: SC0019281; NRF-2016R1A3B1908431; 834431

OSTI ID:: 1866724

Journal Information:: Nature Photonics, Vol. 15, Issue 2; ISSN 1749-4885

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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