Effects of the Selective Alkoxy Side Chain Position in Quinoxaline-Based Polymer Acceptors on the Performance of All-Polymer Solar Cells
- Authors
- You, Hoseon; Lee, Seungjin; Kim, Donguk; Kang, Hyunbum; Lim, Chulhee; Kim, Felix Sunjoo; Kim, Bumjoon J.
- Issue Date
- Oct-2021
- Publisher
- American Chemical Society
- Keywords
- all-polymer solar cells; polymer acceptor; quinoxaline-based n-type polymer; side chain engineering; side chain position
- Citation
- ACS Applied Materials and Interfaces, v.13, no.40, pp 47817 - 47825
- Pages
- 9
- Journal Title
- ACS Applied Materials and Interfaces
- Volume
- 13
- Number
- 40
- Start Page
- 47817
- End Page
- 47825
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/50877
- DOI
- 10.1021/acsami.1c12288
- ISSN
- 1944-8244
1944-8252
- Abstract
- The effects of the position of alkoxy side chains in quinoxaline (Qx)-based polymer acceptors (PAs) on the characteristics of materials and the device parameters of all-polymer solar cells (all-PSCs) are investigated. The alkoxy side chains are selectively located at the meta, para, and both positions in pendant benzenes of Qx units, constructing PAs denoted as P(QxCN-T2)-m, P(QxCN-T2)-p, and P(QxCN-T2), respectively. Among them, P(QxCN-T2)-m exhibits the deepest energy levels owing to the enhanced electron-withdrawing effect of meta-positioned alkoxy chains, which is in contrast to P(QxCN-T2)-p where para-positioned alkoxy chains have an electron-donating property. In addition, the meta-positioned alkoxy chains induce good electron-conducting pathways, while the para-positioned ones significantly interrupt crystallization and intermolecular interactions between the conjugated backbones. Thus, when the PAs are applied to all-PSCs, a power conversion efficiency (PCE) of 5.07% is attained in the device using P(QxCN-T2)-m with efficient exciton dissociation and good electron-transporting ability. On the contrary, the P(QxCN-T2)-p-based counterpart has a PCE of only 1.62%. These results demonstrate that introducing alkoxy side chains at a proper location in the Qx-based PAs is crucial for their application to all-PSCs. © 2021 American Chemical Society.
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