title: Efficient green solar cells via a chemically polymerizable donor-acceptor heterocyclic pentamer.
abstract: In this contribution, we report on bulk-heterojunction solar cells using a solution-processable neutral green conjugated copolymer based on 3,4-dioxythiophene and 2,1,3-benzothiadiazole as the donor and [6,6]phenyl-C61 butyric acid methyl ester (PCBM) as the acceptor. We have found that the short-circuit current is very sensitive to the composition of the donor-acceptor blend and it increases with increasing acceptor concentration. The device with a donor-acceptor ratio of 1:8 gives the best performance with a short-circuit current of 5.56 mA/cm(2), an open-circuit voltage of 0.77 V, and a power conversion efficiency of 1.9% under AM 1.5 solar illumination. The incident photon-to-current efficiency (IPCE) of the green solar cells shows two bands, one with a maximum of 57% in the UV region corresponding to absorption of PCBM and a second one with a maximum of 42% at longer wavelengths corresponding to the absorption of the green polymer.
authors.forename: Jegadesan
authors.initials: J
authors.lastname: Subbiah
authors.forename: Pierre M
authors.initials: PM
authors.lastname: Beaujuge
authors.forename: Kaushik Roy
authors.initials: KR
authors.lastname: Choudhury
authors.forename: Stefan
authors.initials: S
authors.lastname: Ellinger
authors.forename: John R
authors.initials: JR
authors.lastname: Reynolds
authors.forename: Franky
authors.initials: F
authors.lastname: So
mesh_terms: D011211:Electric Power Supplies; D004579:Electron Transport; D004867:Equipment Design; D019544:Equipment Failure Analysis; D055772:Green Chemistry Technology / Q000295:instrumentation*; D006571:Heterocyclic Compounds / Q000737:chemistry* / Q000528:radiation effects; D008027:Light; D008422:Materials Testing; D011108:Polymers / Q000737:chemistry* / Q000528:radiation effects; D012993:Solar Energy; D015032:Zinc / Q000737:chemistry* / Q000528:radiation effects
chemical_list: D006571:Heterocyclic Compounds; D011108:Polymers; D015032:Zinc