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Donor–acceptor conjugated polymers based on two-dimensional thiophene derivatives for bulk heterojunction solar cells
| Content Provider | Semantic Scholar |
|---|---|
| Author | Dong, Xin Tian, Hongkun Xie, Zhiyuan Geng, Yanhou Wang, Fosong |
| Copyright Year | 2017 |
| Abstract | Four donor–acceptor (D–A) conjugated polymers (CPs), i.e., poly[(E)-1,2-bis(5-(2-hexyldecyl)-[2,3′-bithiophen]-2′-yl)ethene-alt-5,6-difluorobenzo[c][1,2,5]thiadiazole] (PTVT-T8), poly[(E)-1,2-bis(5-(2-octyldodecyl)-[2,3′-bithiophen]-2′-yl)ethene-alt-5,6-difluorobenzo[c][1,2,5]thiadiazole] (PTVT-T10), poly[(E)-1,2-bis(3-(2-hexyldecyl)thiophen-2-yl)ethene-alt-5,6-difluorobenzo[c][1,2,5]thiadiazole] (PTVT-C8) and poly[(E)-1,2-bis(3-(2-octyldodecyl)thiophen-2-yl)ethene-alt-5,6-difluorobenzo[c][1,2,5]thiadiazole] (PTVT-C10) were synthesized and characterized. Compared to PTVT-C8 and PTVT-C10, PTVT-T8 and PTVT-T10 that comprise two-dimensional (2D) conjugated D units displayed lower bandgaps, more rigid backbones, higher self-organization ability and shorter π–π stacking distances (∼3.5 A). As a result, the hole mobility of PTVT-T8 and PTVT-T10 (up to 0.42 cm2 (V s)−1) was one magnitude higher than that of PTVT-C8 and PTVT-C10 (up to 0.039 cm2 (V s)−1), as measured with organic field-effect transistors (OFETs). Polymer solar cells (PSCs) of these polymers were prepared with PC71BM as an acceptor and o-xylene as a processing solvent, and power conversion efficiencies (PCEs) up to 6.79%, 5.65%, 3.94% and 1.70% were achieved for PTVT-T8, PTVT-T10, PTVT-C8 and PTVT-C10, respectively. PTVT-T8 and PTVT-T10 exhibited photovoltaic properties superior to PTVT-C8 and PTVT-C10 owing to their high hole-mobility and the formation of ordered nano-fibrillar structures in which polymer backbones preferred face-on arrangement. |
| Starting Page | 421 |
| Ending Page | 430 |
| Page Count | 10 |
| File Format | PDF HTM / HTML |
| DOI | 10.1039/C6PY01767C |
| Alternate Webpage(s) | http://www.rsc.org/suppdata/c6/py/c6py01767c/c6py01767c1.pdf |
| Alternate Webpage(s) | https://doi.org/10.1039/C6PY01767C |
| Volume Number | 8 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
