Abstract
X-ray diffraction patterns, Atomic-force microscopic images, water-droplet contact angle images, absorbance spectra, photoluminescence (PL) quenching experiments and nanosecond time-resolved PL curves were used to investigate the formation of CH3NH3PbI3 (MAPbI3) crystalline thin films on top of poly[3-(4-carboxybutyl)thiophene-2,5-diyl]-Na (P3CT-Na) with the different regioregularities. The experimental results show that the higher regioregularity P3TC-Na can result in the larger MAPbI3 grains along the (110) direction of tetragonal perovskite and thereby increasing the averaged power conversion efficiency (PCE) of the resultant perovskite photovoltaic cells from 14.13% to 16.81% mainly due to the reduced potential loss in the MAPbI3 crystalline thin film. Besides, a remarkable fill factor of 80.9% was achieved, which can be used to explain the stable photovoltaic performance of the encapsulated cells.
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