title: Solution-processed organic photovoltaic cells with anthracene derivatives.
abstract: Solution-processed small-molecule bulk heterojunction photovoltaic cells are fabricated by using [6,6]-phenyl-C(61)-butyric acid methyl ester (PCBM) as electron acceptor and triisopropylsilylethynyl anthracene (TIPSAnt) derivatives substituted with naphthalene (TIPSAntNa) and bithiophene (TIPSAntBT) as electron donors. In contrast to TIPS-pentacene, the TIPSAnt derivatives are not susceptible to Diels-Alder reactions with PCBM when processed in solution, as confirmed by UV/Vis measurements. Photoluminescence quenching measurements show exciton diffusion lengths of 5 and 3 nm for TIPSAntBT and TIPSAntNa, respectively. Blending TIPSAntBT and TIPSAntNa with PCBM (1:1, 1:2, 1:3, and 1:4 weight ratios) produces films that possess adequate hole and electron mobilities. The morphological changes that result from varying the blending ratio range from obvious phase-segregated crystalline domains at a 1:1 ratio to homogeneous, nearly amorphous phases at a 1:4 ratio. Bulk heterojunction solar cells prepared by using a TIPSAntBT:PCBM blend reach power conversion efficiencies as high as 1.4 %.
authors.affiliation: Organic Electronics Laboratory, Department of Chemical Engineering, Pohang University of Science and Technology, Pohang, 790-784, Korea.
authors.forename: Dae Sung
authors.initials: DS
authors.lastname: Chung
authors.forename: Jong Won
authors.initials: JW
authors.lastname: Park
authors.forename: Won Min
authors.initials: WM
authors.lastname: Yun
authors.forename: Hyojung
authors.initials: H
authors.lastname: Cha
authors.forename: Yun-Hi
authors.initials: YH
authors.lastname: Kim
authors.forename: Soon-Ki
authors.initials: SK
authors.lastname: Kwon
authors.forename: Chan Eon
authors.initials: CE
authors.lastname: Park
mesh_terms: D000873:Anthracenes / Q000737:chemistry*; D004736:Energy-Generating Resources; D037741:Fullerenes / Q000737:chemistry; D012993:Solar Energy; D012996:Solutions
chemical_list: C539575:(6,6)-phenyl C61-butyric acid methyl ester; D000873:Anthracenes; D037741:Fullerenes; D012996:Solutions; C034020:anthracene