Journal
ADVANCED ENERGY MATERIALS
Volume 11, Issue 8, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202002552
Keywords
composition engineering; ion migration; oxide stability; perovskite solar cells; superoxide
Categories
Funding
- National Natural Science Foundation of China [51673218, 51802355, 11804117, 61674070]
- Natural Science Foundation of Hunan Province [2018JJ3625]
- Innovation-Driven Project of Central South University [2020CX006]
- Hunan Provincial Science and Technology Department [2017XK2030]
- National Science Foundation [DMR-1903962]
- Postgraduate Research and Innovation Project of Central South University [1053320192763]
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This study found that introducing a moderate amount of cesium ions can effectively hinder the synergistic effect between oxygen-induced degradation and ion migration in organic-inorganic hybrid perovskite solar cells, improving the stability and performance of the cells.
Organic-inorganic hybrid perovskite solar cells are susceptible to multiple influencing factors such as moisture, oxygen, heat stress, ion migration. Given the complex practical working conditions for solar cells, a fundamental question is how different failure mechanisms collaborate and substantially accelerate the device degradation. In this study, it is found that ion migration can slow the reaction between oxygen and methylammonium lead iodide perovskite in light conditions. This is suggested since regions with local electric fields suffer from more severe decomposition. Here it is reported that cesium ions (Cs+) incorporated in perovskite lattice, with a moderate doping concentration (e.g. 5%), can function as stabilizers to efficiently interrupt such a synergistic effect between oxygen induced degradation and ion migration while retaining the high performance of perovskite solar cells. Both experimental and theoretical results suggest that 5% Cs+ ions incorporation simultaneously suppresses the formation of reactive superoxide ions (O2-) as well as ion migration in perovskites by forming additional energy barriers. This A-site cations engineering is also a promising strategy to circumvent the detrimental effect of oxygen molecules in FA-based perovskites, which is important for developing high-efficiency perovskite solar cells with enhanced stability.
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