AI Article Synopsis
- A new series of A-D-A'-D-A-type electron acceptors composed of alkylated indacenodithiophene and dicyanated thiophene-flanked benzothiadiazole derivatives were synthesized to study their photovoltaic properties.
- The CNDTBT-C8IDT-FINCN variant showed superior characteristics, exhibiting lower energy levels, better light absorption, and efficient charge transport, which contributed to its high power conversion efficiency (PCE) of 12.33%.
- Additionally, large-area organic solar cells using this acceptor achieved a solid PCE of 9.21%, indicating its potential for practical applications in solar technology.
Article Abstract
In this work, a series of A-D-A'-D-A-type electron acceptors based on alkylated indacenodithiophene (C8IDT), dicyanated thiophene-flanked 2,1,3-benzothiadiazole (CNDTBT), and 2-(3-oxo-2,3-dihydro-1-inden-1-ylidene)malononitrile (INCN) or 2-(5,6-difluoro-3-oxo-2,3-dihydro-1-inden-1-ylidene) malononitrile (FINCN) are synthesized in order to investigate the effect of substituents on their photovoltaic properties. The corresponding CNDTBT-C8IDT-INCN and CNDTBT-C8IDT-FINCN acceptors vary in their optical, electrochemical, morphological, and charge transport properties. The fluorinated-INCN-based acceptor (CNDTBT-C8IDT-FINCN) exhibits lower energy levels, improved absorptivity, narrower π-π spacing, and prominent fibrillar structures when it is blended with poly[(2,6-(4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)-benzo[1,2-:4,5-']dithiophene))--5,5-(1',3'-di-2-thienyl-5',7'-bis(2-ethylhexyl)benzo [1',2'-:4',5'-']dithiophene-4,8-dione)] (PBDB-T). CNDTBT-C8IDT-FINCN exhibits a high power conversion efficiency (PCE) of 12.33% due to its high and well-balanced charge carrier mobility and distinct face-on orientation. Furthermore, large-area organic solar cells (OSCs) (active area: 55.45 cm) with CNDTBT-C8IDT-FINCN exhibit a high PCE of 9.21%. This result demonstrates that CNDTBT-C8IDT-FINCN is a suitable and promising electron acceptor for large-area OSCs.
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| http://dx.doi.org/10.1021/acsami.0c13277 | DOI Listing |
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