期刊
NATURE PHOTONICS
卷 13, 期 8, 页码 532-+出版社
NATURE PORTFOLIO
DOI: 10.1038/s41566-019-0435-1
关键词
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资金
- European Union project PERT PV [763977]
- ERC [771528]
- PERSEO 'PERrovskite-based solar cells: towards high efficiency and long-term stability' [20155LECAJ]
- Ministero Istruzione dell'Universita e della Ricerca (MIUR)
- University of Perugia
- CNPq (Conselho Nacional de Desenvolvimento Cientifico e Tecnologico-Brasil) [206502/2014-1]
- European Union [797546]
- European Research Council (ERC) [771528] Funding Source: European Research Council (ERC)
- Marie Curie Actions (MSCA) [797546] Funding Source: Marie Curie Actions (MSCA)
Metal halide perovskites have become a popular material system for fabricating photovoltaics and various optoelectronic devices. However, long-term reliability must be assured. Instabilities are manifested as light-induced ion migration and segregation, which can lead to material degradation. Discordant reports have shown a beneficial role of ion migration under illumination, leading to defect healing. By combining ab initio simulations with photoluminescence measurements under controlled conditions, we demonstrate that photo-instabilities are related to light-induced formation and annihilation of defects acting as carrier trap states. We show that these phenomena coexist and compete. In particular, long-living carrier traps related to halide defects trigger photoinduced material transformations, driving both processes. Defect formation can be controlled by blocking under-coordinated surface sites, which act as a defect reservoir. By use of a passivation strategy we are thus able to stabilize the perovskite layer, leading to improved optoelectronic material quality and enhanced photostability in solar cells.
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