Tetrathienodibenzocarbazole based donor-acceptor type wide band-gap copolymers for polymer solar cell applications
Journal
Macromolecules
Journal Volume
47
Journal Issue
21
Pages
7407-7415
Date Issued
2014
Author(s)
Abstract
Two new donor–acceptor alternating wide band gap copolymers, PTTDBC-PhQC8 and PTTDBC-BTC12, based on an electron-rich tetrathienodibenzocarbazole (TTDBC) donor have been designed and synthesized, wherein two additional thienyl rings are fused into a 2,7-dithienylcarbazole skeleton to reinforce the structural coplanarity and rigidity of polymers. The quinoid thiophene in TTDBC can endow not only a wide optical band gap (∼1.9 eV) but also a deep HOMO (∼5.3 eV) for the resulting polymers. The conventional configuration solar cells based on PTTDBC-BTC12 exhibit a large Voc of 0.91 V and a power conversion efficiency of 4.30% (with a Jsc of 9.27 mA cm–2 and a FF of 0.51), while a slightly higher PCE of 4.50% can be achieved for the inverted structure devices. We believe that these wide band gap polymers have potential to be used for tandem cell applications.
SDGs
Publisher
American Chemical Society
Type
journal article