Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 137, Issue 32, Pages 10399-10405Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.5b06444
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Funding
- National Natural Science Foundation of China [51273104]
- 973 Program Early Projects [2014CB260405]
- Advanced Talents Program of Hebei Province [GCC2014013]
- Top Young Outstanding Innovative Talents Program of Hebei Province [BJ2014009]
- Natural Science Foundation of Hebei Province [F2015201189]
- 100 Talents Program of Hebei Province
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The highly developed crystallization process with respect to perovskite thin films is favorable for efficient solar cells. Here, an innovative intermolecular self-assembly approach was employed to retard the crystallization of PbI2 in dimethylformamide (DMF) by additional solvent of dimethyl sulfoxide (DMSO), which was proved to be capable of coordinating with PbI2 by coordinate covalent bond. The obtained PbI2(DMSO)(x) (0 <= x <= 1.86) complexes tend to be closely packed by means of intermolecular self-assembly. Afterward, an intramolecular exchange of DMSO with CH3NH3I (MAI) enabled the complexes to deform their shape and finally to reorganize to be an ultraflat and dense thin film of CH3NH3PbI3. The controllable grain morphology of perovskite thin film allows obtaining a power conversion efficiency (PCE) above 17% and a stabilized power output above 16% within 240 s by controlling DMSO species in the complex-precursor system (CPS). The present study gives a reproductive and facile strategy toward high quality of perovskite thin films and efficient solar cells.
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