Synthesis and applications of low-bandgap conjugated polymers containing phenothiazine donor and various benzodiazole acceptors for polymer solar cells

Harihara Padhy, Jen Hsien Huang, Duryodhan Sahu, Dhananjaya Patra, Dhananjay Kekuda, Chih Wei Chu, Hong Cheu Lin

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A series of soluble donor-acceptor conjugated polymers comprising of phenothiazine donor and various benzodiazole acceptors (i.e., benzothiadiazole, benzoselenodiazole, and benzoxadiazole) sandwiched between hexyl-thiophene linkers were designed, synthesized, and used for the fabrication of polymer solar cells (PSC). The effects of the benzodiazole acceptors on the thermal, optical, electrochemical, and photovoltaic properties of these low-bandgap (LBG) polymers were investigated. These LBG polymers possessed large molecular weight (Mn) in the range of 3.85-5.13 × 104 with high thermal decomposition temperatures, which demonstrated broad absorption in the region of 300-750 nm with optical bandgaps of 1.80-1.93 eV. Both the HOMO energy level (-5.38 to -5.47 eV) and LUMO energy level (-3.47 to -3.60 eV) of the LBG polymers were within the desirable range of ideal energy level. Under 100 mW/cm2 of AM 1.5 white-light illumination, bulk heterojunction PSC devices containing an active layer of electron donor polymers mixed with electron acceptor [6,6]-phenyl-C61-butyric acid methyl ester (PC 61BM) or [6,6]-phenyl-C71-butyric acid methyl ester (PC71BM) in different weight ratios were investigated. The best performance of the PSC device was obtained by using polymer PP6DHTBT as an electron donor and PC71BM as an acceptor in the weight ratio of 1:4, and a power conversion efficiency value of 1.20%, an open-circuit voltage (Voc) value of 0.75 V, a short-circuit current (Jsc) value of 4.60 mA/cm2, and a fill factor (FF) value of 35.0% were achieved.

Original languageEnglish
Pages (from-to)4823-4834
Number of pages12
JournalJournal of Polymer Science, Part A: Polymer Chemistry
Issue number21
Publication statusPublished - 01-11-2010


All Science Journal Classification (ASJC) codes

  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

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