Overcoming the electroluminescence efficiency limitations of perovskite light-emitting diodes

被引：2607

作者：

Cho, Himchan ^{[1
]}

Jeong, Su-Hun ^{[1
]}

Park, Min-Ho ^{[1
]}

Kim, Young-Hoon ^{[1
]}

Wolf, Christoph ^{[1
]}

Lee, Chang-Lyoul ^{[2
]}

Heo, Jin Hyuck ^{[3
]}

Sadhanala, Aditya ^{[4
]}

Myoung, NoSoung ^{[2
]}

Yoo, Seunghyup ^{[5
]}

Im, Sang Hyuk ^{[3
]}

Friend, Richard H. ^{[4
]}

Lee, Tae-Woo ^{[1
,6
]}

机构：

[1] Pohang Univ Sci & Technol POSTECH, Dept Mat Sci & Engn, Pohang 790784, Gyungbuk, South Korea

[2] Gwangju Inst Sci & Technol GIST, Adv Photon Res Inst APRI, Gwangju 500712, South Korea

[3] Kyung Hee Univ, Coll Engn, Dept Chem Engn, Youngin Si 446701, Gyeonggi Do, South Korea

[4] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England

[5] Korea Adv Inst Sci & Technol, Dept Elect Engn, Daejeon 305701, South Korea

[6] Pohang Univ Sci & Technol POSTECH, Sch Environm Sci & Engn, Div Adv Mat Sci, Dept Chem Engn, Pohang 790784, Gyungbuk, South Korea

来源：

SCIENCE | 2015年 / 350卷 / 6265期

基金：

英国工程与自然科学研究理事会;

关键词：

ORGANOMETAL HALIDE PEROVSKITE; PERFORMANCE SOLAR-CELLS; INTERFACIAL CONTROL; HYBRID PEROVSKITE; TRIHALIDE; DEPOSITION; DIFFUSION; CRYSTALS; GROWTH; PB;

D O I：

10.1126/science.aad1818

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Organic-inorganic hybrid perovskites are emerging low-cost emitters with very high color purity, but their low luminescent efficiency is a critical drawback. We boosted the current efficiency (CE) of perovskite light-emitting diodes with a simple bilayer structure to 42.9 candela per ampere, similar to the CE of phosphorescent organic light-emitting diodes, with two modifications: We prevented the formation of metallic lead (Pb) atoms that cause strong exciton quenching through a small increase in methylammonium bromide (MABr) molar proportion, and we spatially confined the exciton in uniform MAPbBr3 nanograins (average diameter = 99.7 nanometers) formed by a nanocrystal pinning process and concomitant reduction of exciton diffusion length to 67 nanometers. These changes caused substantial increases in steady-state photoluminescence intensity and efficiency of MAPbBr(3) nanograin layers.

引用

页码：1222 / 1225

页数：4

共 34 条

[1] Controllable Self-Induced Passivation of Hybrid Lead Iodide Perovskites toward High Performance Solar Cells [J].