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Organic solar cells(OSCs)and perovskite solar cells(PSCs)are two exciting classes of photovoltaic technologies,and are under intensive investigation in universities,academic institutions and industrial companies due to their potential of mass production on flexible substrates through low-cost roll-to-roll techniques.Interface materials are either insulating,semiconducting or conducting materials which play a crucial role in high performance OSCs and PSCs by improving light absorption,charge transportation and carrier evacuation in devices.