期刊
RSC ADVANCES
卷 5, 期 104, 页码 85344-85349出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ra17579h
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资金
- National Basic Research Program of China [2011CBA00701]
- National High Technology Research and Development Program of China [2011AA050510]
- National Natural Science Foundation of China [21171084]
- Returned Overseas Researcher Foundation from the Ministry of Education
- Program for Scientific Research Innovation Team in Colleges and Universities of Shandong Province antae-Shan Scholar Research Fund
Crystallization and decomposition of organolead trihalide perovskites (OTPs) are very sensitive to the presence of water in precursor or in ambient conditions. Thus, understanding equilibrium behaviours (crystallization and decomposition) of OTPs in aqueous solution is very critical for OTP solar cells fabricated with water-based precursor solutions. Here, equilibrium behaviours in an aqueous solution of CH3NH3PbI3 (MAPbI(3)) single crystals (MSCs) were studied. Diethyl ether, as an antisolvent, effectively diffused and induced MSC growth by screening different solvents (diethyl ether, tetrahydrofuran, dichloromethane, and chloroform). The structure transforms from the initial PbI2 to intermediate (H chi PbI2+chi center dot chi H2O) and finally MSCs were observed by X-ray diffraction. Decomposition of MSCs in aqueous solution was significantly enhanced by potassium iodide coordination and inhibited by CH3NH3I (MAI) addition. We ascribed this inhibition behaviour to suppressing MAI migration from the MSC crystal structure. Finally, the optical properties of MSC were studied.
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