title: Photovoltaic devices with a low band gap polymer and CdSe nanostructures exceeding 3% efficiency.
abstract: We report the fabrication and measurement of solar cells approaching a power conversion efficiency of 3.2% using a low band gap conjugated polymer poly[2,6-(4,4-bis-(2-ethylhexyl)-4H-cyclopenta[2,1-b;3,4-b']dithiophene)-alt-4,7-(2,1,3-benzothiadiazole)] and CdSe nanoparticles. These devices exhibit an external quantum efficiency (EQE) of >30% in a broad range of 350-800 nm with a maximum EQE of 55% in a range of 630-720 nm. We also present certified device efficiencies of 3.13% under AM 1.5 illumination.
authors.affiliation: National Renewable Energy Laboratory, 1617 Cole Boulevard, Golden, Colorado 80401, USA. smita.dayal@nrel.gov
authors.forename: Smita
authors.initials: S
authors.lastname: Dayal
authors.forename: Nikos
authors.initials: N
authors.lastname: Kopidakis
authors.forename: Dana C
authors.initials: DC
authors.lastname: Olson
authors.forename: David S
authors.initials: DS
authors.lastname: Ginley
authors.forename: Garry
authors.initials: G
authors.lastname: Rumbles