Distinct exciton dissociation behavior of organolead trihalide perovskite and excitonic semiconductors studied in the same system

Miao Hu; Cheng Bi; Yongbo Yuan; Zhengguo Xiao; Qingfeng Dong; Yuchuan Shao; Jinsong Huang

doi:10.1002/smll.201402905

Distinct exciton dissociation behavior of organolead trihalide perovskite and excitonic semiconductors studied in the same system

Small. 2015 May 13;11(18):2164-9. doi: 10.1002/smll.201402905. Epub 2015 Jan 15.

Authors

Miao Hu¹, Cheng Bi, Yongbo Yuan, Zhengguo Xiao, Qingfeng Dong, Yuchuan Shao, Jinsong Huang

Affiliation

¹ Department of Mechanical and Materials Engineering and Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln, Lincoln, NE, 68588-0526, USA.

PMID: 25641931
DOI: 10.1002/smll.201402905

Abstract

The nonexcitonic character for organometal trihalide perovskites is demonstrated by examining the field-dependent exciton dissociation behavior. It is found that photogenerated excitons can be effectively dissociated into free charges inside perovskite without the assistance of charge extraction layer or external field, which is a stark contrast to the charge-separation behavior in excitonic materials in the same photovoltaic operation system.

Keywords: Organolead trihalide perovskites; dielectric constants; dissociation; excitons; perovskites, external quantum efficiency.

Publication types

Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.