Proceedings of International Conference on Perovskite Thin Film Photovoltaics, Photonics and Optoelectronics (ABXPV18PEROPTO)
Publication date: 11th December 2017
CH3NH3PbI3 polycrystalline thin films have been intensively investigated as light-absorbing layers in solution-processable perovskite solar cells. It has been pointed out that iodide ions diffusing via vacancies are responsible for large ionic conduction and for I-V hysteresis in part. We propose to control iodide ion vacancies in CH3NH3PbI3 by fabricating polycrystalline films using vacuum co-evaporation of HI, CH3NH2 and PbI2. In this presentation, we report on iodide ion vacancy and electron/hole densities in CH3NH3PbI3 thin films based on a defect chemistry analysis. We show by the simulation that concentration of the vacancies can be controlled by activities (partial pressures) of HI and CH3NH2 gasses in the co-evaporation process. In addition, conductivities can be controlled through designed electron/hole densities by changing the activities. We also present preliminary results of a ternary co-evaporation experiment using HI and CH3NH2 gas sources and a PbI2 solid source. We introduced a ternary vacuum evaporation system and successfully fabricated (110)-oriented CH3NH3PbI3 thin films.
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