Donor-acceptor random copolymers based on a ladder-type nonacyclic unit

Synthesis, characterization, and photovoltaic applications

Chiu Hsiang Chen, Yen Ju Cheng, Chih Yu Chang, Chain Shu Hsu

Research output: Contribution to journalArticle

55 Citations (Scopus)

Abstract

We have developed a ladder-type multifused thienyl-phenylene-thienylene- phenylene-thienyl (TPTPT) unit where each thiophene ring is covalently fastened with the adjacent benzene rings by a carbon bridge, forming four cyclopentadiene rings embedded in a nonacyclic structure. This rigid and coplanar TPTPT building block was copolymerized with electron-deficient acceptors, dibromobenzothiadiazole (BT) or dibromodithienyldiketopyrrolopyrrole (DPP), via Stille polymerization. By varying the feed ratio of the monomers, a new series of random copolymers PTPTPTBT11, PTPTPTBT12, PTPTPTDPP11, PTPTPTDPP12, and PTPTPTDPP13 with tunable optical and electronic properties were prepared. The PTPTPTDPP12/PC71BM (1:4, w/w) based device exhibited the highest short circuit current (Jsc) of 10.78 mA/cm2 with a good power conversion efficiency (PCE) of 4.3% due to the much boarder absorption ability and the highest hole mobility of PTPTPTDPP12. The devices based on PTPTPTDPP13, PTPTPTDPP11, PTPTPTBT12, and PTPTPTBT11 polymers also displayed promising efficiencies of 4.1%, 3.6%, 3.1%, and 2.8%, respectively. Most importantly, PTPTPTDPP12 has been demonstrated as a superior low-band-gap material for polymer solar cell with inverted architecture, achieving a high PCE of 5.1%.

Original languageEnglish
Pages (from-to)8415-8424
Number of pages10
JournalMacromolecules
Volume44
Issue number21
DOIs
Publication statusPublished - Nov 8 2011
Externally publishedYes

Fingerprint

Ladders
Conversion efficiency
Copolymers
Cyclopentanes
Thiophenes
Hole mobility
Thiophene
Benzene
Electronic properties
Short circuit currents
Polymers
Energy gap
Carbon
Optical properties
Monomers
Polymerization
Electrons
Polymer solar cells

ASJC Scopus subject areas

  • Organic Chemistry
  • Materials Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry

Cite this

Donor-acceptor random copolymers based on a ladder-type nonacyclic unit : Synthesis, characterization, and photovoltaic applications. / Chen, Chiu Hsiang; Cheng, Yen Ju; Chang, Chih Yu; Hsu, Chain Shu.

In: Macromolecules, Vol. 44, No. 21, 08.11.2011, p. 8415-8424.

Research output: Contribution to journalArticle

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