Journal Article Research Support, U.S. Gov't, Non-P.H.S. Research Support, Non-U.S. Gov't organic photovoltaics 122168-67-6 6-(Dimethylamino)-2-((1E,3E)-4-(4-(dimethylamino)phenyl)-1,3-butadien-1-yl)-1-ethylquinolinium perchlorate Lewis acids N(4)-benzyl-N(6),N(6)-dimethyl-1-1(tert-butyl)-1H-pyrazolo(3,4-d)pyrimidine-6,4-diamine Organic Chemicals Pyrazoles Pyrimidines Pyrroles Pyrrolidinones Solutions Thiadiazoles bulk heterojunction charge transport charge-transfer states conjugated polymers diketopyrrolopyrrole electroluminescence molecular donor molecular donors molecular doping organic semiconductors organic solar cells