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Photovoltaic performance of the organic solar cells(OSCs)based on 2-((5′-(4-((4-((E)-2-(5′-(2,2-dicyanovinyl)-3′,4-dihexyl-2,2′-bithiophen-5-yl)vinyl)phenyl)(phenyl)amino)styryl)-4,4′-dihexyl-2,2′-bithiophen-5-yl)methylene)malononitrile(L(TPAbTV-DCN))as donor and PC70BM as acceptor was optimized using 0.25 vol%high boiling point solvent additive of1-chloronaphthalene(CN),1,6-hexanedithiol(HDT),or 1,8-diodooctane(DIO).The optimized OSC based on L(TPA-bTVDCN)–PC70BM(1:2,w/w)with 0.25 vol%CN exhibits an enhanced power conversion efficiency(PCE)of 2.61%,with Voc of0.87 V,Jsc of 6.95 mA/cm2,and FF of 43.2%,under the illumination of 100 mW/cm2 AM 1.5 G simulated solar light,whereas the PCE of the OSC based on the same active layer without additive is only 1.79%.The effect of the additive on absorption spectra and the atomic force microscopy images of L(TPA-bTV-DCN)–PC70BM blend films were further investigated.The improved efficiency of the device could be ascribed to the enhanced absorption and optimized domain size in the L(TPA-bTV-DCN)–PC70BM blend film.
Photovoltaic performance of the organic solar cells (OSCs) based on 2 - ((5 ’- (4 - ((4 - ((E) -2- (5’- (2,2- dicyanovinyl) (phenyl) amino) styryl) -4,4’-dihexyl-2,2’-bithiophen-5-yl) methylene) malononitrile -DCN)) as donor and PC70BM as acceptor was optimized using 0.25 vol% high boiling point solvent additive of 1-chloronaphthalene (CN), 1,6-hexanedithiol (HDT), or 1,8-diodooctane based on L (TPA-bTVDCN) -PC70BM (1: 2, w / w) with 0.25 vol% CN exhibits an enhanced power conversion efficiency (PCE) of 2.61% with Voc of 0.87 V, Jsc of 6.95 mA / cm2 , and FF of 43.2%, under the illumination of 100 mW / cm2 AM 1.5 G simulated solar light, while the PCE of the OSC based on the same active layer without additive is only 1.79%. The effect of the additive on absorption spectra and the atomic force microscopy images of L (TPA-bTV-DCN) -PC70BM blend films were further investigated. The improved efficiency of the device could be ascribed to the enha nced absorption and optimized domain size in the L (TPA-bTV-DCN) -PC70BM blend film.