The Effect of Silicon Substitution in Indacenodithiophene-Based A2-A1-D-A1-A2-Type Nonfullerene Acceptors on the Performance of High-Voltage Organic Solar Cells

Dai T, Du M, Wang H, Li X, He Z, Meng Y, Yang F, Tang A, Geng Y, Zhou E (2022)

Publication Type: Journal article

Publication year: 2022

Journal

Solar RRL Wiley-VCH

DOI: 10.1002/solr.202200750

Abstract

In recent years, the organic solar cells (OSCs) research hotspot is the modification of end groups and alkyl side chains of A-DA’D-A-type nonfullerene acceptors (NFAs). However, the development of novel NFAs by changing the different bridged atom substitution of the central core is lagging behind. Herein, two wide-bandgap A2-A1-D-A1-A2-type NFAs with different central cores, namely BTA501 and BTA502, are developed to improve the photovoltaic performance of high-voltage OSCs. BTA501 adopted an indacenodithiophene (IDT) core, whereas BTA502 applied a silaindacenodithiophene (SiIDT) core. Expectedly, the SiIDT-based BTA502 exhibits a higher lowest unoccupied molecular orbital level and wider bandgap than BTA501, which thus enhances the open-circuit voltage (V OC) but slightly decreases the short-circuit current density (J SC) of OSCs. Moreover, the stronger self-aggregation characteristics and weaker π–π stacking of BTA502 severely affect the exciton dissociation and charge transport. When blended with two classic p-type polymers J52-F and PTB7-Th, both combinations based on BTA502 exhibit inferior device performance compared with BTA501. Excitingly, the device of J52-F: BTA501 achieves a V OC of 1.037 V with a power conversion efficiency of 11.82% and a J SC of 15.89 mA cm−2, which are among the highest values for high-voltage OSCs with V OC above 1.0 V.

Authors with CRIS profile

Fu Yang Institute Materials for Electronics and Energy Technology (i-MEET)

Involved external institutions

National Center for Nanoscience and Technology (NCNST) / 国家纳米科学中心 CN China (CN)

How to cite

APA:

Dai, T., Du, M., Wang, H., Li, X., He, Z., Meng, Y.,... Zhou, E. (2022). The Effect of Silicon Substitution in Indacenodithiophene-Based A2-A1-D-A1-A2-Type Nonfullerene Acceptors on the Performance of High-Voltage Organic Solar Cells. Solar RRL. https://dx.doi.org/10.1002/solr.202200750

MLA:

Dai, Tingting, et al. "The Effect of Silicon Substitution in Indacenodithiophene-Based A2-A1-D-A1-A2-Type Nonfullerene Acceptors on the Performance of High-Voltage Organic Solar Cells." Solar RRL (2022).

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