Competition between Oxygen Curing and Ion Migration in MAPbI3 Induced by Irradiation Exposure
- 23 September 2020
- journal article
- research article
- Published by American Chemical Society (ACS) in The Journal of Physical Chemistry Letters
- Vol. 11 (20), 8477-8482
- https://doi.org/10.1021/acs.jpclett.0c02649
Abstract
Organometal halide perovskites (OHPs) have been considered as promising materials for light-emission devices. However, the factors influencing the luminescent property of OHPs are intricate. It is not only affected by the intrinsic crystalline quality but also depends on the surrounding environment. Here we demonstrate that the luminescence of CH3NH3PbI3 (MAPbI3) is governed by light-irradiation-induced oxygen curing and vacancy-mediated ion migration. The luminescence increases under continuous irradiation because of the curing of iodine vacancies (VI) by oxygen. While, it decreases with enhanced ion migration, which would induce excess trap states. The existence of VI is proved by low-temperature photoluminescence (PL) spectra, the hysteresis effect in J–V curves, and the excitation density dependence of the PL lifetime. Different oxygen environments and applied biases are employed to control the degree of oxygen curving and ion migration. These results provide a perception of the correlation of the complicated influencing factors affecting the luminescence of OHPs.Funding Information
- Ministry of Education of the People's Republic of China
- Ministry of Science and Technology of the People's Republic of China (2017YFA0205700, 2019YFA0308000)
- Natural Science Foundation of Jiangsu Province (BK20170694)
- National Natural Science Foundation of China (11704068, 61705106, 61774034, 91963130)
This publication has 39 references indexed in Scilit:
- Rational molecular passivation for high-performance perovskite light-emitting diodesNature Photonics, 2019
- Switching excitonic recombination and carrier trapping in cesium lead halide perovskites by airCommunications Physics, 2018
- Perovskite light-emitting diodes based on spontaneously formed submicrometre-scale structuresNature, 2018
- Perovskite light-emitting diodes with external quantum efficiency exceeding 20 per centNature, 2018
- Fully textured monolithic perovskite/silicon tandem solar cells with 25.2% power conversion efficiencyNature Materials, 2018
- Photon-generated carriers excite superoxide species inducing long-term photoluminescence enhancement of MAPbI3 perovskite single crystalsJournal of Materials Chemistry A, 2017
- Mechanistic insights into perovskite photoluminescence enhancement: light curing with oxygen can boost yield thousandfoldPhysical Chemistry Chemical Physics, 2015
- Bright light-emitting diodes based on organometal halide perovskiteNature Nanotechnology, 2014
- High Charge Carrier Mobilities and Lifetimes in Organolead Trihalide PerovskitesAdvanced Materials, 2013
- Organometal Halide Perovskites as Visible-Light Sensitizers for Photovoltaic CellsJournal of the American Chemical Society, 2009