Journal Article semiconducting polymers solar cells Polymers Research Support, Non-U.S. Gov't Thiazoles thiazolothiazole (6,6)-phenyl C61-butyric acid methyl ester 71243-84-0 Ag mesh Fullerenes Polystyrenes Thiophenes Tin Compounds bulk heterojunctions dithienylthienothiophenebisimide indium tin oxide maximum power point tracking test mechanical robustness molecular orientation operation stability orientation poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) reverse-offset printing side chain stretchable transparent electrodes transistors transparent polyimide ultrathin organic solar cells ultrathin photonic devices