A new series of random conjugated copolymers containing 3,4-diphenyl-maleimide and thiophene units for organic photovoltaic cell applications

Li Hsin Chan, Shiang Yin Juang, Ming Chou Chen, Yu Jou Lin

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

A series of random conjugated copolymers (labeled PMLTQT, PMLT2T, and PMLT3T) consisting of 3,4-diphenyl-maleimide and various thiophene derivatives has been designed and synthesized via Stille cross-coupling for application in polymer solar cells. These copolymers were readily soluble in common organic solvents, thermally stable from 405 to 437 °C upon heating, and exhibited good absorption in the UV and visible regions from 300 to 650 nm. The intensities of the PL emission spectra of these copolymers in a solid film were dramatically quenched by the addition of 50 wt% [6,6]-phenyl C61 butyric acid methyl ester (PC61BM). Their electrochemical properties indicated that the highest occupied molecular orbital levels of these copolymers were in the range of -5.63-5.73 eV, characteristic of better air stability and a high open-circuit voltage (Voc) suitable for application to photovoltaic cells. Bulk heterojunction photovoltaic devices composed of an active layer of electron-donor copolymers blended with the electron acceptor PC61BM or [6,6]-phenyl C71 butyric acid methyl ester (PC71BM) at a weight ratio of 1:3 were investigated. The photovoltaic device containing PMLT3T and PC71BM (1:3, w/w) as the active layer afforded the best performance among these copolymers, with a Voc of 0.74 V, Jsc of 7.4 mA cm-2 and a PCE of 1.20% under AM 1.5 G simulated solar light.

Original languageEnglish
Pages (from-to)2334-2346
Number of pages13
JournalPolymer
Volume53
Issue number12
DOIs
StatePublished - 25 May 2012

Keywords

  • 3,4-diphenyl-maleimide
  • Organic photovoltaic cell
  • Random copolymer

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