Isomeric Effect of a π Bridge in an IDT-Based Nonfused Electron Photovoltaic Acceptor.
Chemistry
; 30(1): e202302624, 2024 Jan 02.
Article
em En
| MEDLINE
| ID: mdl-37806959
ABSTRACT
A pair of isomers, IDT-BOF containing Sâ
â
â
O/Fâ
â
â
H noncovalently configurational locks and IDT-BFO containing Fâ
â
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H/Oâ
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â
H noncovalently configurational locks, with an acceptor-π-donor-π-acceptor (A-π-D-π-A) structure have been designed and synthesized by choosing 4,9-dihydro-s-indaceno[1,2-b 5,6-b']dithiophene (IDT) as the D unit, an F/n-hexyloxy substituted phenyl ring as π bridge, and 3-(dicyanomethylidene)indan-1-one as the A unit. Owing to the Sâ
â
â
O/Fâ
â
â
H or Fâ
â
â
H/Oâ
â
â
H noncovalently configurational locks, both IDT-BOF and IDT-BFO have a completely planar structure. IDT-BOF exhibits a similar LUMO to IDT-BFO, but higher HOMO energy levels, leading to a smaller optical bandgap and red-shifted absorption. However, IDT-BOF-based bulk-heterojunction organic solar cells (BHJ-OSCs) coupled with PBDB-T, and PCE-10 as donor materials both exhibited a lower PCE than that of IDT-BFO (PBDB-T 5.2 vs. 6.1 %; PCE-10 1.7 vs. 3.2 %). Comprehensively comparing and investigating IDT-BOF PBDB-T and IDT-BFO PBDB-T OSCs suggested that the large phase separation and serious charge recombination of IDT-BOF-based OSCs contributed to its lower power conversion efficiency. Importantly, ternary solar cells based on PBDB-T Y5 as control devices with an additional 10 % IDT-BFO exhibited a 5 % enhancement in the PCE compared to the control device (14.3 vs. 13.46 %).
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MEDLINE
Idioma:
En
Ano de publicação:
2024
Tipo de documento:
Article