title: Polymer/polymer blend solar cells with 2.0% efficiency developed by thermal purification of nanoscale-phase-separated morphology.
abstract: We have fabricated polymer/polymer blend solar cells consisting of poly(3-hexylthiophene) as the electron donor and poly{2,7-(9,9-didodecylfluorene)-alt-5,5-[4',7'-bis(2-thienyl)-2',1',3'-benzothiadiazole]} as the acceptor. The power conversion efficiency (PCE) was strongly dependent on solvents employed for spin coating. The best PCE of 2.0% was obtained for thermally annealed devices prepared from a chloroform solution, in contrast to devices fabricated from chlorobenzene and o-dichlorobenzene solutions. On the basis of the morphology-performance relationship in the polymer blends examined by atomic force microscopy and the photoluminescence quenching measurements, we conclude that the highly efficient performance is achieved by thermal purification of nanoscale-phase-separated domains formed by spin coating from chloroform.
authors: Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo, Kyoto 615-8510, Japan.
authors: Daisuke
authors: D
authors: Mori
authors: Hiroaki
authors: H
authors: Benten
authors: Junya
authors: J
authors: Kosaka
authors: Hideo
authors: H
authors: Ohkita
authors: Shinzaburo
authors: S
authors: Ito
authors: Kunihito
authors: K
authors: Miyake
mesh_terms: D002722:Chlorobenzenes / Q000737:chemistry; D002725:Chloroform / Q000737:chemistry; D005456:Fluorescent Dyes / Q000737:chemistry; D018625:Microscopy, Atomic Force; D036103:Nanotechnology; D011108:Polymers / Q000737:chemistry*; D012993:Solar Energy; D013696:Temperature; D013876:Thiophenes / Q000737:chemistry
chemical_list: D002722:Chlorobenzenes; D005456:Fluorescent Dyes; D011108:Polymers; D013876:Thiophenes; C507295:poly(3-hexylthiophene); C004726:2-dichlorobenzene; D002725:Chloroform