Layer number dependent exciton dissociation and carrier recombination in 2D Ruddlesden-Popper halide perovskites

被引：26

作者：

Lu, Junlin ^{[1
,2
,3
]}

Chen, Weijian ^{[1
,4
]}

Zhou, Chunhua ^{[1
]}

Yang, Shuang ^{[5
]}

Wang, Chong ^{[6
]}

Wang, Rongfei ^{[6
]}

Wang, Xin ^{[2
,3
,7
]}

Gan, Zhixing ^{[8
,9
]}

Jia, Baohua ^{[1
]}

Wen, Xiaoming ^{[1
]}

机构：

[1] Swinburne Univ Technol, Ctr Translat Atomat, Hawthorn, Vic 3122, Australia

[2] South China Normal Univ, South China Acad Adv Optoelect, Guangzhou 510631, Guangdong, Peoples R China

[3] South China Normal Univ, Int Acad Optoelect Zhaoqing, Guangzhou 510631, Guangdong, Peoples R China

[4] Univ New South Wales UNSW, Australian Ctr Adv Photovolta, Sch Photovolta & Renewable Energy Engn, Kensington, NSW 2052, Australia

[5] East China Univ Sci & Technol, Shanghai Engn Res Ctr Hierarch Nanomat, Sch Mat Sci & Engn, Key Lab Ultrafine Mat,Minist Educ, Shanghai 200237, Peoples R China

[6] Yunnan Univ, Sch Mat & Energy, Natl Ctr Int Res Photoelect & Energy Mat, Kunming 650091, Yunnan, Peoples R China

[7] South China Normal Univ, South China Acad Adv Optoelect, Inst Elect Paper Displays, Guangdong Prov Key Lab Opt Informat Mat & Technol, Guangzhou 510006, Peoples R China

[8] Nanjing Normal Univ, Sch Comp & Elect Informat, Ctr Future Optoelect Funct Mat, Sch Artificial Intelligence, Nanjing 210023, Peoples R China

[9] Qingdao Univ Sci & Technol, Coll Mat Sci & Engn, Qingdao 266042, Peoples R China

来源：

JOURNAL OF MATERIALS CHEMISTRY C | 2021年 / 9卷 / 28期

基金：

澳大利亚研究理事会;

关键词：

FREE CHARGES; SOLAR-CELLS; EFFICIENCY; DYNAMICS; CH3NH3PBI3; STATES; PHASE;

D O I：

10.1039/d1tc01656c

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

It has been a consensus that the exciton binding energies in two-dimensional (2D) Ruddlesden-Popper perovskites is closely correlated with the number of layers. However, the detailed recombination dynamics of excitons and free carriers in these 2D perovskites are still highly controversial. Using transient spectroscopic techniques, carrier dynamics of 2D Ruddlesden-Popper perovskites are investigated at both room and low temperatures. We confirmed that 2D perovskites of (BA)(2)PbI4, with the number of [PbX6](4-) layers n = 1, exhibit clearly exciton characteristic properties. Meanwhile, (BA)(2)(MA)Pb2I7 and (BA)(2)(MA)(2)Pb3I10, n = 2 and 3, exhibit free carrier behaviour, which is inconsistent with their binding energies of more than 100 meV. Such anomalous exciton and free carrier behaviours are attributed to the effective exciton in-plane transport and dissociation by the edge state. This investigation provides novel insights into exciton and charge carrier dynamics of 2D perovskites as well as the influence of edge states.

引用

页码：8966 / 8974

页数：9