Journal Article n-type polymer semiconductors organic electrochemical transistors organic thermoelectrics PBFDO all-polymer solar cells buried interface catalyst aggregation cation exchange charge carrier dynamics conductivity conjugated polymer cyano functionalization dark‐current suppression defect passivation efficiency stretchability factor electrical conductivity electron affinity energetic band switching glucose sensors halogen functionalization in situ electrochemical resonant Raman spectroscopy indoor photovoltaics large-area blade-coating devices mixed ionic-electronic conductors morphology optimization multi-component photoactive layer multi-spectrum image sensor n‐type conductive polymers n‐type doping