Journal
DYES AND PIGMENTS
Volume 204, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2022.110459
Keywords
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Funding
- Youth Science Foundation of Henan Province [202300410239]
- Department of Education Project-Henan Province
- Basic Research Project of Key Scientific Research Project [21A430023]
- Science and the Technique Program of Henan Province [212102210582]
- Doctoral Scientific Research Starting Foundation of Henan Normal University [5101249170010]
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This study focuses on the crucial step of using non-halogenated solvents for the fabrication of polymer solar cells. The synthesized wide bandgap polymer PBDT-ST, along with the appropriate solvents and additives, shows promising photovoltaic performance.
The use of non-halogenated solvents for the fabrication of polymer solar cells (PSCs) is a crucial step for commercial applications in the future. Herein, we synthesize a wide bandgap polymer PBDT-ST with alkylthio chains substituted benzodithiophene (BDT) as donor unit and carboxylate-substituted BDT as acceptor unit. The polymer PBDT-ST possesses a wide bandgap over 1.90 eV and a deep highest occupied molecular orbitals (HOMO) levels below -5.50 eV, which is beneficial to obtain a high open circuit voltage (V-oc). In addition, PBDT-ST shows good solubility in halogenated and non-halogenated solvents. The o-xylene processed PBDT-ST:ITIC-2F blend film exhibits improved molecular order, film morphology and charge mobilities compared with o-dichlorobenzene (o-DCB) processed one. As the results, the o-DCB processed PBDT-ST:ITIC-2F based device can achieve a power conversion efficiency (PCE) of 10.48%. When the non-halogenated o-xylene as solvents and non-halogenated diphenyl ether (DPE) as additive, an improved PCE of 11.14% can be obtained with V-oc of 0.90 V, J(sc) of 17.83 mA/cm(2) and FF of 69.36%. Our research indicates that carboxylate-substituted BDT based polymer PBDT-ST as a promising wide bandgap donor material can achieve excellent photovoltaic performance for PSCs processed by non-halogenated solvent.
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