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Benzothienoisoindigo-based polymers for efficient polymer solar cells with an open-circuit voltage of 0.96 V.
- Source :
-
Polymer . Jun2019, Vol. 175, p339-346. 8p. - Publication Year :
- 2019
-
Abstract
- Two conjugated polymers have been designed and synthesized by introducing benzothienoisoindigo as electron-withdrawing moieties on side chains. PBDTT-TBID based on alkylthienyl-substituted benzo[1,2- b :4,5- b ']dithiophene (BDT) derivative as electron-donating moieties possesses a low-lying highest occupied molecular orbital energy level of −5.38 eV, so its polymer solar cells (PSCs) shows a high open-circuit voltage (V oc) of 0.96 V, which is one of the highest V oc values among benzothienoisoindigo-based polymers. PBDT-TBID based on alkoxyl-substituted BDT derivative possesses better molecular coplanarity, stronger intramolecular charge transfer, stronger intermolecular π-π stacking, more suitable microphase separation with PC 71 BM, more effective exciton dissociation, and higher hole mobility than PBDTT-TBID , which lead to higher short-circuit current density (J sc = 11.81 mA cm−2), fill factor (FF = 0.58) and power conversion efficiency (PCE = 5.87%) values than those based on PBDTT-TBID. The PCE value is still higher than those of the reported benzothienoisoindigo-based polymers though it lags behind those of recent non-fullerene PSCs. Image 1 • Benzothienoisoindigo-based polymer achieves a V oc of 0.96 V. • PBDT-TBID shows the best photovoltaic performance in benzothienoisoindigo -based polymers. • The effects of the side chains on the properties of the polymers are studied. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00323861
- Volume :
- 175
- Database :
- Academic Search Index
- Journal :
- Polymer
- Publication Type :
- Academic Journal
- Accession number :
- 136985633
- Full Text :
- https://doi.org/10.1016/j.polymer.2019.05.043