Broadband Emission in Two-Dimensional Hybrid Perovskites: The Role of Structural Deformation

被引：365

作者：

Cortecchia, Daniele ^{[1
,2
]}

Neutzner, Stefanie ^{[2
]}

Kandada, Ajay Ram Srimath ^{[2
]}

Mosconi, Edoardo ^{[3
,4
]}

Meggiolaro, Daniele ^{[3
,4
]}

De Angelis, Filippo ^{[3
,4
]}

Soci, Cesare ^{[5
]}

Petrozza, Annamaria ^{[2
]}

机构：

[1] Nanyang Technol Univ, Energy Res Inst NTU ERI N, Interdisciplinary Grad Sch, Singapore 639798, Singapore

[2] Ist Italiano Tecnol, Ctr Nano Sci & Technol CNST PoliMi, Via Pascoli 70-3, I-20133 Milan, Italy

[3] Univ Perugia, Dipartimento Chim, Ist CNR Sci & Tecnol Mol, I-06123 Perugia, Italy

[4] Ist Italiano Tecnol, CompuNet, Via Morego 30, I-16163 Genoa, Italy

[5] Nanyang Technol Univ, Sch Phys & Math Sci, Div Phys & Appl Phys, Singapore 637371, Singapore

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2017年 / 139卷 / 01期

基金：

新加坡国家研究基金会; 欧盟地平线“2020”;

关键词：

LIGHT-EMITTING-DIODES; LEAD IODIDE; SEMICONDUCTORS; CH3NH3PBI3; METHYLAMMONIUM; EFFICIENCY; ENERGY;

D O I：

10.1021/jacs.6b10390

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Only a selected group of two-dimensional (2D) lead halide perovskites shows a peculiar broad-band photoluminescence. Here we show that the structural distortions of the perovskite lattice can determine the defectivity of the material by modulating the defect formation energies. By selecting and comparing two archetype systems, namely, (NBT)(2)PbI4 and (EDBE)PbI4 perovskites (NBT = n-butylammonium and EDBE = 2,2-(ethylenedioxy)bis(ethylammonium)), we find that only the latter, subject to larger deformation of the Pb-X bond length and X-Pb-X bond angles, sees the formation of V-F color centers whose radiative decay ultimately leads to broadened PL. These findings highlight the importance of structural engineering to control the optoelectronic properties of this class of soft materials.

引用

页码：39 / 42

页数：4

共 36 条

[1] Defect migration in methylammonium lead iodide and its role in perovskite solar cell operation [J].