1. Manipulating multicrystalline grain size in CH3NH3PbI3 thin films for application in photovoltaics.
- Author
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Chen, Cheng-Chiang, Chang, Sheng Hsiung, Chen, Lung-Chien, Cheng, Hsin-Ming, Tseng, Zong-Liang, and Wu, Chun-Guey
- Subjects
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GRAIN size , *METALLIC thin films , *PHOTOVOLTAIC power systems , *CHEMICAL precursors , *NUCLEATION , *POLYSTYRENE - Abstract
The multicrystalline grain size of CH 3 NH 3 PbI 3 thin films can be manipulated by using different precursor concentrations which dominate the competition between the nucleation and crystal growth during the one-step spin-coating process with the toluene washing treatment. A comprehensive study was carried out to explore the correlation between the structural properties and the exciton dynamics in CH 3 NH 3 PbI 3 thin films fabricated using various precursor concentrations from 1.25 M to 1.65 M. The experimental results show that the precursor concentration influences the grain size and exciton dynamics of the resultant CH 3 NH 3 PbI 3 thin films which were fabricated on top of poly(3,4-ethylenedioxythiophene)-polystyrene sulfonate/ITO/glass substrates. The higher average power conversion efficiency (PCE) of 13.66% achieved can be explained as being due to the formation of a larger CH 3 NH 3 PbI 3 grain size which thus results in higher photocurrent generation and lower voltage loss. It is predicted that the PCE can be further improved when the voltage loss across the CH 3 NH 3 PbI 3 thin film is minimized. [ABSTRACT FROM AUTHOR]
- Published
- 2016
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