Publication date: 8th January 2019
The rapid development of perovskites especially in more recent years and their rather facile fabrication techniques has made them materials of high interest for photovoltaics applications. Recent novel engineering formulations and fabrication techniques have led to significant increase in power conversion efficiency, with recent photovoltaic devices exhibiting over 22% in efficiency. Convective self-assembly (CSA) is a technique used in film deposition that allows us to alter the microstructure of the active layer by varying both the casting temperature and speed. Using CSA we have obtained perovskite (CH3NH3PbI3-xClx) crystals of different sizes and morphology randomly distributed on the film surface, with their resulting optoelectronic properties depending on casting conditions, as it was revealed by emission and absorption spectroscopy, scanning electron microscopy, optical and photoluminescence microscopy. Furthermore, we have experimentally determined that perovskite crystals obtained using post-deposition treatment at lower temperatures (from 0 °C to 30 °C) and employing extended crystallization time (from 30 min to 3h) were larger in size.
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