Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 24, Issue 23, Pages 3631-3638Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201303953
Keywords
conjugated polymers; ladder-type polymers; organic photovoltaics; organic field-effect transistors; reorganization energy
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Funding
- 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
- China Scholarship Council
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A multi-ring, ladder-type low band-gap polymer (PIDTCPDT-DFBT) is developed to show enhanced light harvesting, charge transport, and photovoltaic performance. It possesses excellent planarity and enhanced effective conjugation length compared to the previously reported fused-ring polymers. In order to understand the effect of extended fused-ring on the electronic and optical properties of this polymer, a partially fused polymer PIDTT-T-DFBT is also synthesized for comparison. The fully rigidified polymer provides lower reorganizational energy, resulting in one order higher hole mobility than the reference polymer. The device made from PIDTCPDT-DFBT also shows a quite promising power conversion efficiency of 6.46%. Its short-circuit current (14.59 mA cm(-2)) is also among the highest reported for ladder-type polymers. These results show that extending conjugation length in fused-ring ladder polymers is an effective way to reduce band-gap and improve charge transport for efficient photovoltaic devices.
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