title: Electronic properties of interfaces between PCPDTBT and prototypical electrodes studied by photoemission spectroscopy.
abstract: We report on the electronic structure of poly[2,6-(4,4-bis- (2-ethylhexyl)-4H-cyclopenta[2,1-b;3,4-b']dithiophene)-alt-4,7(2,1,3-benzothiadiazole)] (PCPDTBT), a promising low-band-gap donor material for efficient bulk heterojunction organic solar cells. Electronic properties of interfaces formed between PCPDTBT and prototypical electrodes [Au, indium-tin-oxide and poly(ethylene-dioxythiophene): poly(styrenesulfonate)], obtained from X-ray photoemission spectroscopy and ultraviolet photoemission spectroscopy, are evaluated. The formation of interface dipoles is observed, and their consequences for device performance are discussed. For the system PCPDTBT/Au chemical interactions occur, which may affect in particular the charge extraction at the corresponding interface.
authors: Institut für Physikalische und Theoretische Chemie, Universität Tübingen, Tübingen, Germany. umut.ayguel@uni-tuebingen.de
authors: Umut
authors: U
authors: Aygül
authors: Heiko
authors: H
authors: Peisert
authors: Johannes
authors: J
authors: Frisch
authors: Antje
authors: A
authors: Vollmer
authors: Norbert
authors: N
authors: Koch
authors: Thomas
authors: T
authors: Chassé
mesh_terms: D004566:Electrodes; D004583:Electrons; D004736:Energy-Generating Resources; D006046:Gold / Q000737:chemistry; D056951:Photoelectron Spectroscopy; D011095:Polyethylenes / Q000737:chemistry; D011108:Polymers / Q000032:analysis / Q000737:chemistry*; D011137:Polystyrenes / Q000737:chemistry; D012993:Solar Energy; D013499:Surface Properties; D013830:Thiadiazoles / Q000032:analysis / Q000737:chemistry*; D017971:Tin Compounds / Q000737:chemistry
chemical_list: D011095:Polyethylenes; D011108:Polymers; D011137:Polystyrenes; D013830:Thiadiazoles; D017971:Tin Compounds; C555055:poly(2,6-(4,4-bis(2-ethylhexyl)-4H-cyclopenta(2,1-b-3,4-b0)dithiophene))-alt-4,7-(2,1,3-benzothiadiazole); C109984:indium tin oxide; D006046:Gold