The addition of quinonoid zwitterion into a hybrid organic–inorganic halide lead perovskite thin film could enhance the perovskite solar cells’ performance

Tóm tắt

Solar cells based on hybrid organic – inorganic halide lead perovskite are potentially promising to be used in the near future. The quality of the perovskite thin film played an important role in the photovoltaic performance of perovskite solar cells. One strategy to improve the quality of the film was to utilize an additive into the precursor solution during the perovskite formation process. This paper presented the use of a quinonoid zwitterion compound at some concentrations from 0 to 2.0 mg.L-1 added to the PbI2 solution to synthesize the CH3NH3PbI3 perovskite thin film which was further implemented to fabricate solar cell devices. The perovskite films were analysed by X-ray diffraction, UV/Vis absorption spectroscopy and Scanning electron microscope and the obtained solar cell devices were characterized by current–voltage curve measurements. The results showed that the addition of the quinonoid zwitterion could increase the efficiency of the perovskite transformation with a film with more uniform morphology and less of voids, leading to a significant improvement of open circuit voltage values of the devices. The overall efficiency of the solar cells fabricated with a perovskite film using 0.5 mg.L-1 additive enhanced up to 2 % in comparison to those of non-additive ones.