Side Chain Optimization of Naphthalenediimide-Bithiophene-Based Polymers to Enhance the Electron Mobility and the Performance in All-Polymer Solar Cells

Wonho Lee, Changyeon Lee, Hojeong Yu, Dong Jun Kim, Cheng Wang, Han Young Woo, Joon Hak Oh, Bumjoon J. Kim

Research output: Contribution to journalArticle

91 Citations (Scopus)

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 cm2 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.

Original languageEnglish
Pages (from-to)1543-1553
Number of pages11
JournalAdvanced Functional Materials
Volume26
Issue number10
DOIs
Publication statusPublished - 2016 Mar 8

Fingerprint

Electron mobility
electron mobility
Polymers
solar cells
optimization
polymers
Organic field effect transistors
Conjugated polymers
Conversion efficiency
Structural properties
Electrons
Electronic properties
Heterojunctions
field effect transistors
Charge transfer
Electric properties
Copolymers
Tuning
Polymer solar cells
naphthalenediimide

Keywords

  • all-polymer solar cells
  • naphthalenediimide
  • P(NDI2OD-T2)
  • Polyera Acitivink N2200
  • side chain engineering

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Side Chain Optimization of Naphthalenediimide-Bithiophene-Based Polymers to Enhance the Electron Mobility and the Performance in All-Polymer Solar Cells. / Lee, Wonho; Lee, Changyeon; Yu, Hojeong; Kim, Dong Jun; Wang, Cheng; Woo, Han Young; Oh, Joon Hak; Kim, Bumjoon J.

In: Advanced Functional Materials, Vol. 26, No. 10, 08.03.2016, p. 1543-1553.

Research output: Contribution to journalArticle

Lee, Wonho ; Lee, Changyeon ; Yu, Hojeong ; Kim, Dong Jun ; Wang, Cheng ; Woo, Han Young ; Oh, Joon Hak ; Kim, Bumjoon J. / Side Chain Optimization of Naphthalenediimide-Bithiophene-Based Polymers to Enhance the Electron Mobility and the Performance in All-Polymer Solar Cells. In: Advanced Functional Materials. 2016 ; Vol. 26, No. 10. pp. 1543-1553.
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