Dioctylfluorene-thiophene based conjugated copolymers for bulk heterojunction solar cells and enhanced power conversion efficiency via methanol treatment

Hung Yi Chuang, Steve Lien Chung Hsu, Li Chiun Chen, Yang Sun, Pi Yun Lin

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

We have synthesized two dioctylfluorene-thiophene based conjugated copolymers, PFTDPP and PFTpBT. After methanol treatment, the power conversion efficiencies (PCEs) could reach 4.25 % and 4.20 %, respectively. Sensible design and synthesis of conjugating polymers is important to the development of polymer solar cells (PSCs). In this work, we synthesized and characterized two dioctylfluorene-thiophene based conjugated copolymers, PFTDPP and PFTpBT, having different acceptor groups on the backbone. The photovoltaic properties of the copolymers blended with 6,6-phenyl-C61-butyric acid methyl ester (PC61BM) as an electron acceptor were obtained. The PSC based on a conventional device configuration ITO/PEDOT:PSS/ Polymer:PC61BM/LiF/Al showed power conversion efficiencies (PCEs) of 2.42% and 3.02% for PFTDPP and PFTpBT, respectively. Methanol treatment was introduced to further optimize device performance, and the solvent treatment gave a dramatic increase in PCE. The best PCEs could reach 4.25% and 4.20% after methanol treatment under AM 1.5G illumination with an intensity of 100 mW cm-2 from a solar simulator.

Original languageEnglish
Pages (from-to)1779-1785
Number of pages7
JournalPolymer International
Volume64
Issue number12
DOIs
Publication statusPublished - 2015 Dec

All Science Journal Classification (ASJC) codes

  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

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