Journal Article solution processing n-type doping Inverter N-type doping N‐type conjugated polymers Seebeck coefficient charge recombination conjugated polymers cross‐link, FAPbI₃ donor-acceptor copolymer donor-acceptor copolymers dopant location electrical conductivity and density of states electrical conductivity and doping level electrochemical Doping half tin and lead perovskite hole extraction layer mixed Ionic‐electronic Conductor organic electrochemical transistors organic thermoelectrics orientation perovskite solar cells photovoltage loss solar cells trap states