Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 24, Issue 10, Pages 1465-1473Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201302426
Keywords
conjugated polymers; organic electronics; photovoltaic devices; field-effect transistors
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Funding
- National Science Foundation [DMR-0120967]
- Air Force Office of Scientific Research [FA9550-09-1-0426]
- Asian Office of Aerospace RD [FA2386-11-1-4072]
- Office of Naval Research [N00014-11-1-0300]
- Boeing Foundation
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A synergistic approach combining new material design and interfacial engineering of devices is adopted to produce high efficiency inverted solar cells. Two new polymers, based on an indacenodithieno[3,2-b]thiophene-difluorobenzothiadiazole (PIDTT-DFBT) donor-acceptor (D-A) polymer, are produced by incorporating either an alkyl thiophene (PIDTT-DFBT-T) or alkyl thieno[3,2-b]thiophene (PIDTT-DFBT-TT) -bridge as spacer. Although the PIDTT-DFBT-TT polymer exhibits decreased absorption at longer wavelengths and increased absorption at higher energy wavelengths, it shows higher power conversion efficiencies in devices. In contrast, the thiophene bridged PIDTT-DFBT-T shows a similar change in its absorption spectrum, but its low molecular weight leads to reduced hole mobilities and performance in photovoltaic cells. Inverted solar cells based on PIDTT-DFBT-TT are explored by modifying the electron-transporting ZnO layer with a fullerene self-assembled monolayer and the MoO3 hole-transporting layer with graphene oxide. This leads to power conversion efficiencies as high as 7.3% in inverted cells. PIDTT-DFBT-TT's characteristic strong short wavelength absorption and high efficiency suggests it is a good candidate as a wide band gap material for tandem solar cells.
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