Journal
CHEMISTRY OF MATERIALS
Volume 27, Issue 14, Pages 5116-5121Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.5b01924
Keywords
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Funding
- National Natural Science Foundation of China [21373083]
- SRF for ROCS, SEM, SRFDP
- Programme for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning
- Fundamental Research Funds for the Central Universities [WD1313009]
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Recently, a hot casting technique was developed to prepare pinhole free perovskite thin films with millimeter-scale grains. However, its intrinsic formation mechanism has not been studied in the literature up to now. Here, we demonstrate a Volmer-Weber growth mechanism during the hot casting, a process that typically involves the formation of island shaped grains and the Mowing integration into dense perovskite films. It was found that such crystal growth was determined by the multiple effect of thermal energy and force centrifugal field. Particularly, the thermal energy can facilitate the formation of CH3NH3PbI3 and overcome the energy barriers of the precursor solutions on the substrates. The detailed morphologies of CH3NH3PbI3 films can be optimized by regulating deposition parameters including casting temperature and rotate speed. Solar cells constructed with these thin films achieve an average power conversion efficiency of 12.6 +/- 0.3% under standard AM 1.5 G conditions.
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