A 19% efficient and stable organic photovoltaic device enabled by a guest nonfullerene acceptor with fibril-like morphology

H Chen, SY Jeong, JF Tian, YD Zhang, DR Naphade, M Alsufyani, WM Zhang, S Griggs, HL Hu, S Barlow, HY Woo, SR Marder, TD Anthopoulos, I McCulloch, YB Lin

Research output: Contribution to journalArticlepeer-review

Abstract

A nonfullerene acceptor, isoIDITC, capable of exhibiting fibril-like morphology, is utilized as a third component in organic photovoltaic devices (OPVs). A power conversion efficiency (PCE) of 19% is achieved in ternary PM6:BTP-eC9:isoIDITC bulk-heterojunction (BHJ) devices. Analyses reveal the formation of an alloy model (BTP-eC9:isoIDTIC) and a well-defined fibril-like network and enhanced crystallization of BHJ in the ternary blend. Slightly increased carrier mobilities, longer carrier lifetimes, and suppressed trap-assisted/bimolecular recombination are observed in the ternary BHJ-based devices compared to the binary PM6:BTP-eC9 BHJ cells. Moreover, because of the high surface energy (γ) and low glass-transition temperature (T g) of BTP-eC9, the acceptor and donor tend to migrate toward the hole and electron collecting electrodes, respectively, during aging tests. Crucially, isoIDTIC with low γ and high T g has a low diffusion coefficient and can suppress demixing in vertical stratification of the BHJ, resulting in an increase in T 80 lifetime from 101 hours to 254 hours. Our results highlight the utilization of the nonfullerene acceptor with fibril-like morphology and high T g as an important third component toward high-performance and stable ternary OPVs.

Original languageEnglish
Pages (from-to)1062-1070
Number of pages10
JournalEnergy & Environmental Science
Volume16
Issue number3
DOIs
Publication statusPublished - 6 Jan 2023

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