title: Broadband absorbing bulk heterojunction photovoltaics using low-bandgap solution-processed quantum dots.
abstract: We describe bulk heterojunction (BHJ) solar cells containing blends of colloidal PbS nanocrystal quantum dots with several new donor-acceptor conjugated polymers. Using photoinduced absorption spectroscopy we found that blends of PbS quantum dots with one polymer, poly(2,3-didecyl-quinoxaline-5,8-diyl-alt-N-octyldithieno[3,2-b:2',3'-d]pyrrole) (PDTPQx), produce significantly more photoinduced charge than blends of PbS with the other donor-acceptor polymers or with traditionally studied polymers like [2-methoxy-5-(3',7'-dimethyloctyloxy)-para-phenylene vinylene] (MDMO-PPV) and poly(3-hexylthiophene) (P3HT). Photovoltaic devices made with PDTPQx/PbS blends exhibit power conversion efficiencies 10-100 times larger than previously reported BHJ blends made with IR-absorbing quantum dots.
authors.affiliation: Department of Chemistry, University of Washington, Seattle, Washington 98195-1700, USA.
authors.forename: Kevin M
authors.initials: KM
authors.lastname: Noone
authors.forename: Elisabeth
authors.initials: E
authors.lastname: Strein
authors.forename: Nicholas C
authors.initials: NC
authors.lastname: Anderson
authors.forename: Pei-Tzu
authors.initials: PT
authors.lastname: Wu
authors.forename: Samson A
authors.initials: SA
authors.lastname: Jenekhe
authors.forename: David S
authors.initials: DS
authors.lastname: Ginger