Side Chain Optimization of Naphthalenediimide-Bithiophene-Based Polymers to Enhance the Electron Mobility and the Performance in All-Polymer Solar Cells
- Authors
- Lee, Wonho; Lee, Changyeon; Yu, Hojeong; Kim, Dong-Jun; Wang, Cheng; Woo, Han Young; Oh, Joon Hak; Kim, Bumjoon J.
- Issue Date
- 8-3월-2016
- Publisher
- WILEY-V C H VERLAG GMBH
- Keywords
- all-polymer solar cells; naphthalenediimide; P(NDI2OD-T2); Polyera Acitivink N2200; side chain engineering
- Citation
- ADVANCED FUNCTIONAL MATERIALS, v.26, no.10, pp.1543 - 1553
- Indexed
- SCIE
SCOPUS
- Journal Title
- ADVANCED FUNCTIONAL MATERIALS
- Volume
- 26
- Number
- 10
- Start Page
- 1543
- End Page
- 1553
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/89227
- DOI
- 10.1002/adfm.201504191
- ISSN
- 1616-301X
- Abstract
- Tuning the side chains of conjugated polymers is a simple, yet effective strategy for modulating their structural and electrical properties, but their impact on n-type conjugated polymers has not been studied extensively, particularly in the area of all-polymer solar cells (all-PSCs). Herein, the effects of side chain engineering of P(NDI2OD-T2) polymer (also known as Polyera Activink N2200) are investigated, which is the most widely used n-type polymer in all-PSCs and organic field-effect transistors (OFETs), on their structural and electronic properties. A series of naphthalenediimide-bithiophene-based copolymers (P(NDIR-T2)) is synthesized, with different side chains (R) of 2-hexyldecyl (2-HD), 2-octyldodecyl (2-OD), and 2-decyltetradecyl (2-DT). The P(NDI2HD-T2) exhibits more noticeable crystalline behaviors than P(NDI2OD-T2) and P(NDI2DT-T2), thereby facilitating superior 3D charge transport. For example, the P(NDI2HD-T2) shows the highest OFET electron mobility (1.90 cm(2) V-1 s(-1)). Also, a series of all-PSCs is produced using different electron donors of PTB7-Th, PTB7, and PPDT2FBT. The P(NDI2HD-T2) based all-PSCs produce much higher power conversion efficiency (PCE) irrespective of the electron donors. In particular, the PTB7-Th: P(NDI2HD-T2) forms highly ordered, strong face-on interchain stackings, and has better intermixed bulk-heterojunction morphology, producing the highest PCE of 6.11% that has been obtained by P(NDIR-T2) based all-PSCs to date.
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