Rational compatibility in a ternary matrix enables all-small-molecule organic solar cells with over 16% efficiency
- Authors
- Jiang, Mengyun; Bai, Hairui; Zhi, Hongfu; Yan, Lu; Woo, Han Young; Tong, Lijia; Wang, Jinliang; Zhang, Fujun; An, Qiaoshi
- Issue Date
- 1-7월-2021
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- ENERGY & ENVIRONMENTAL SCIENCE, v.14, no.7, pp.3945 - 3953
- Indexed
- SCIE
SCOPUS
- Journal Title
- ENERGY & ENVIRONMENTAL SCIENCE
- Volume
- 14
- Number
- 7
- Start Page
- 3945
- End Page
- 3953
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/137159
- DOI
- 10.1039/d1ee00496d
- ISSN
- 1754-5692
- Abstract
- How to manipulate the phase separation and molecular arrangement to meet the need of efficient charge generation and extraction remains a long-standing challenge in all-small-molecule organic solar cells (ASM-OSCs). Herein, a small molecule acceptor Y7 as a morphology modulator was incorporated into a B1:BO-4Cl matrix to fabricate ternary ASM-OSCs. Y7 possesses excellent compatibility with the acceptor BO-4Cl but poor compatibility with the donor B1. The two acceptors prefer to form an alloy-like structure in ternary blends due to their good compatibility, which is conducive to fine-tuning the molecular arrangement for facilitating charge extraction. The inferior compatibility originating from the strong intermolecular interaction between Y7 and B1 can provide a driving force to manipulate the phase separation between the donor and acceptor for gaining well-formed nanofibrous and bi-continuous interpenetrating networks, leading to efficient charge separation, transport and collection in ternary blends. The ternary ASM-OSCs with 10 wt% Y7 in acceptors achieve a top-ranked power conversion efficiency of 16.28% with a holistic improvement of short-circuit current density, open-circuit voltage and fill factor. This work opens a new avenue to optimize the morphology for further boosting the performance of OSCs.
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