An anode interfacial layer is reported for bulk-heterojunction (BHJ) polymer solar cells to replace the commonly used poly(3,4- ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS). A poly[9,9-dioctylfluorene-co-N-[4-(3-methylpropyl)]-diphenylamine] (TFB) +4, 4′ -bis[(p -trichlorosilylpropylphenyl)phenylamino]biphenyl (TPD Si2) blend is crosslinked, forming robust ∼10 nm thick films covalently bound to indium tin oxide, which transport holes while blocking misdirected electrons. The thermal stability and photovoltaic performance metrics of TFB:TPD Si2 -modified BHJ cells are significantly greater than those of cells fabricated in parallel with PEDOT:PSS or with no interfacial layer. For a poly[2-methoxy-5- (3′, 7′ -dimethyloctyloxyl]-1,4-phenylene vinylene: methanofullerene[6 6]-phenyl C61-butyric acid methyl ester cell, Voc =0.89 V, Jsc =4.62 mA cm2, FF=54.4%, and p =2.23%.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)