Unravelling the mechanism of photo-activated ion dynamics in organic-inorganic perovskites

Sheng Chen, Xiaoming Wen, Rui Sheng, Shujuan Huang, Martin A. Green, Anita Ho-Baillie

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contributionpeer-review

Abstract

Study of the emission behavior of organometal halide perovskites CH3NH 3 PbBr 3 as function of excitation intensity by using photoluminescence (PL) and time-resolved photoluminescence (TRPL) techniques reveals the photo-activated mobile ion can evidently impact carrier dynamics in the minutes time scale. We observe that PL intensity and PL decay exhibit excitation intensity dependent reductions in the minute time scale under continuous excitation at constant intensity. It has been confirmed that the carrier recombination intimately related to the density of photoexcited carriers. However, this long response time suggests photo-activated ion migration, rather than photo-generated electrons and holes, are responsible for the observed change in carrier dynamics. The observations provide insight into the nonradiative behavior of perovskite material under illumination. Because free carrier recombination process is linked to charge separation/ transportation efficiency, these key findings are useful for understanding of instability of perovskite solar cells.

Original languageEnglish
Title of host publication2016 IEEE 43rd Photovoltaic Specialists Conference (PVSC)
Place of PublicationPiscataway, NJ
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Pages756-759
Number of pages4
ISBN (Electronic)9781509027248
ISBN (Print)9781509027255
DOIs
Publication statusPublished - 2016
Externally publishedYes
Event43rd IEEE Photovoltaic Specialists Conference, PVSC 2016 - Portland, United States
Duration: 5 Jun 201610 Jun 2016

Conference

Conference43rd IEEE Photovoltaic Specialists Conference, PVSC 2016
CountryUnited States
CityPortland
Period5/06/1610/06/16

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