Journal Article ultrathin photonic devices Ag mesh Cu nanoshells DNA detection bar coating biosensors direct patterning flexible photodetectors gate dielectrics maximum power point tracking test mechanical conformability mechanical robustness mixed ionic-electronic conductors naked-eye detection near infrared photodetectors norovirus operation stability organic diodes organic electrochemical diodes organic electrochemical transistor organic electrochemical transistors organic mixed ionic–electronic conductor organic rectifiers regioregular polymers reverse-offset printing sol-gel metal oxides stretchable transparent electrodes thin-film transistors transparent polyimide