Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Publication date: 28th March 2016
The effect on both the film properties and the cell characteristics of lead halide perovskite photoactive layers formed by excess Pb-containing precursor solution are investigated.
Perovskite photoactive layers were prepared in a single step from precursor solutions containing a mixture of formaidinium iodide (FAI), lead iodide (PbI2), methylammonium bromide (MABr), and lead bromide (PbBr2). The molar ratio for Pb/(FA+MA) was varied from 1.0 to 1.4 while maintaining a fixed molar ratio of 0.85 for FA/(FA+MA) and I/(Br+I) in the precursor solutions. The film properties and the cell characteristics of lead halide perovskite layers with excess Pb-containing precursor solutions are analyzed by X-ray diffraction, scanning electron microscopy (SEM), time-resolved photoluminescence (TRPL), and current-voltage measurements.
The cross-sectional SEM images showed that the perovskite film with large crystal size can be obtained by the excess Pb-containing precursor solution, supposing the decrease of the number of trap sites due to the reduction of the grain boundary. In TRPL decay measurements, carrier lifetime became longer in the perovskite films with the excess Pb-containing precursor solution than that in the perovskite film fabricated by using a stoichiometric precursor, indicating the suppression of carrier recombination.
Based on these film evaluation, solar cells with perovskite film at a molar ratio of 1.2 for Pb/(FA+MA) showed distinct improvement in fill-factor (FF) and open circuit voltage (VOC), resulting in the cell efficiency of 17.5%,while the cell efficiency was 16.1% at a molar ratio of 1.0 for Pb / (FA + MA).
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