Effects of ambient air processing on morphology and photoconductivity of CH3NH3PbI3
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Ambient air synthesis offers the possibility to reduce the cost of production for perovskite solar cells. We have investigated the morphological and charge transport properties of CH3NH3PbI3 under dark and one sun illumination. Synthesis of CH3NH3PbI3 was carried out using different concentrations of CH3NH3I employing two step ambient air synthesis process in order to find an optimum concentration for such synthesis. Effect of different operating temperatures on photoconductive properties of perovskite films has also been investigated by varying the temperature from 300 to 340 K. Our investigations conclude that compactness of perovskite film plays more crucial role in determining charge transport properties, especially under illumination and at varying temperature. The process parameter i.e. low concentration of CH3NH3I, which leads to large crystal size, also creates more voids/pin holes under ambient air synthesis. Present investigation shows that an optimum concentration of 0.050 M of CH3NH3I achieves best grain size to voids ratio and optimum photoconductive properties.
KeywordsPbI2 Perovskite Solar Cell Hole Transport Layer Coated Glass Slide Charge Transport Property
This research was funded by Higher Education Commission Pakistan through Grant Number 213-58732-2EG2-014(50023541).
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