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Li, Yun ; Wang, Menghan ; Wu, Fupeng ; Gao, Xuyu ; Hüttner, Sven ; Tao, Youtian ; Jiang, Zuo-Quan:
Short-Axis Methyl Substitution Approach on Indacenodithiophene : A New Multi-Fused Ladder-Type Arene for Organic Solar Cells.
In: Frontiers in Chemistry.
Bd. 7
(2019)
.
- 372.
ISSN 2296-2646
DOI: https://doi.org/10.3389/fchem.2019.00372
Abstract
Indacenodithiophene (IDT) is a promising building block for designing organic semiconductors. In this work, a new pentacyclic ladder-type arene IDMe was designed and synthesized by introducing methyl substitution on the short-axis of IDT. Two non-fullerene electron acceptors (IDIC and ID-MeIC) without and with methyl substitution were designed and synthesized for further study. Compared with IDIC, ID-MeIC with methyl substitution on the short-axis of IDT shows smaller bandgap, stronger extinction coefficient, and better crystallinity. Besides, PBDB-T: ID-MeIC blend film shows more efficient exciton generation and dissociation and more balanced charge transport mobility. Therefore, polymer solar cells based on PBDB-T: ID-MeIC can achieve better photovoltaic performance with a PCE of 6.46 and substantial increase in J<sub>SC</sub> to 14.13 mA cm<sup>−2</sup> compared to 4.94 and 9.10 mA cm<sup>−2</sup> of PBDB-T: IDIC. These results suggest that short-axis substitution on multi-fused ladder-type arenes, such as IDT is an effective way to change the optical and electronic properties of the organic semiconductors for high-performance OPVs.