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Surface Passivation on PEDOT:PSS in conventional perovskite solar cells

PEDOT:PSS has been widely used as a hole conductive polymer due to its high conductivity and transparency, which is ideal for thin film solar cell with large-scale printing processability. We demonstrated a simple way to enhance the efficiency and reproducibility of PEDOT:PSS-based normalstructure perovskite solar cells. Metal oxide MoO3 layer has been thermal-evaporated onto PEDOT:PSS as a surface passivation layer. The PCE of perovskite solar cell has been enhanced by 18% after MoO3 passivation and the short circuit current density (Jsc), open circuit voltage (Voc) and fill factor (FF) has been improved simultaneously. The performance enhancement of MoO3 modified PSCs is attributed to the reduced current leakage, enhanced hole extraction characteristics, and mitigated the trap-assisted interfacial recombination.