期刊
SCIENCE
卷 370, 期 6512, 页码 74-+出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.abb8985
关键词
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资金
- National Natural Science Foundation of China [61774046]
- China Postdoctoral Science Foundation [2017M611440]
- Shanghai Institute of Intelligent Electronics and Systems
- Swiss Federal Office of Energy (SFOE)-BFE [SI/501805-01]
- Swiss National Science Foundation through the NCCR MUST and individual grant [200020_185092]
- European Union's Horizon 2020 research and innovation program [826013]
- King Abdulaziz City for Science and Technology (KACST)
- Swiss National Science Foundation [200020_185041]
Mixtures of cations or halides with FAPbI(3) (where FA is formamidinium) lead to high efficiency in perovskite solar cells (PSCs) but also to blue-shifted absorption and long-term stability issues caused by loss of volatile methylammonium (MA) and phase segregation. We report a deposition method using MA thiocyanate (MASCN) or FASCN vapor treatment to convert yellow delta-FAPbI(3) perovskite films to the desired pure alpha-phase. NMR quantifies MA incorporation into the framework. Molecular dynamics simulations show that SCN- anions promote the formation and stabilization of alpha-FAPbI(3) below the thermodynamic phase-transition temperature. We used these low-defect-density alpha-FAPbI(3) films to make PSCs with >23% power-conversion efficiency and long-term operational and thermal stability, as well as a low (330 millivolts) open-circuit voltage loss and a low (0.75 volt) turn-on voltage of electroluminescence.
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