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Hole conductor-free, fully printable mesoscopic perovskite solar cells with carbon electrode have a good commercialization prospect because of low-cost production and high power conversion efficiency. Currently, the problem of improving the stability of perovskite solar cells is very important for commercialization.
We prepared hole conductor-free, fully printable mesoscopic perovskite solar cells by treatment with the toluene solution containing polystyrene on the carbon electrode. The polystyrene treatment did not have a significant effect on the conductivity of the carbon layer, facilitating charge transfer at the interfaces, and reducing charge recombination, thereby the power conversion efficiency was improved by 24% compared to the control. In addition, as the polystyrene was coated on the perovskite crystal surface and increased the corrosion stability against moisture, the perovskite solar cells without sealing maintained 90% of the initial efficiency even after 100h operation under light conditions of AM1.5(100mW/cm2) intensity. The polystyrene is an effective material that can improve the performance and stability of perovskite solar cells.
Our group published our results in "Journal of Materials Science: Materials in Electronics" (2021, 32, 13440-13449), an international academic journal under the title of "Effect of Polystyrene treatment on the efficiency and stability of fully printable mesoscopic perovskite solar cells with carbon electrode". (https://doi.org/10.1007/s10854-021-05922-6)