Synthesis, characterization, and photovoltaic properties of dithienylbenzobisazole‐dithienylsilole copolymers

Bhuwalka, Achala; Ewan, Monique D.; Mike, Jared F.; Elshobaki, Moneim; Kobilka, Brandon; Chaudhary, Sumit; Jeffries‐EL, Malika

doi:10.1002/pola.27603

Synthesis, characterization, and photovoltaic properties of dithienylbenzobisazole‐dithienylsilole copolymers

Journal Article · Sat Mar 28 00:00:00 EDT 2015 · Journal of Polymer Science. Part A, Polymer Chemistry

DOI:https://doi.org/10.1002/pola.27603· OSTI ID:1400912

Bhuwalka, Achala ^[1]; Ewan, Monique D. ^[1]; Mike, Jared F. ^[1]; Elshobaki, Moneim ^[2]; Kobilka, Brandon ^[1]; Chaudhary, Sumit ^[3]; Jeffries‐EL, Malika ^[1]

Department of Chemistry Iowa State University Ames Iowa 50011
Department of Materials Science &, Engineering Iowa State University Ames Iowa 50011, Physics Department Mansoura University Mansoura 35516 Egypt
Department of Electrical and Computer Engineering Iowa State University Ames Iowa 50011

ABSTRACT

Three conjugated polymers comprised of dioctyl‐dithieno‐[2,3‐ b :2',3'‐ d ]silole and a donor‐acceptor‐donor triad of either cis‐ benzbisoxazole, trans ‐benzobisoxazole or trans ‐benzobisthiazole were synthesized via the Stille cross‐coupling reaction. The impact of varying the heteroatoms and/or the location within the benzobisazole moiety on the optical and electronic properties of the resulting polymers was evaluated via cyclic voltammetry and UV‐Visible spectroscopy. All of the polymers have similar optical band‐gaps of ∼1.9 eV and highest occupied molecular orbital levels of − 5.2 eV. However, the lowest unoccupied molecular orbitals (LUMO) ranged from − 3.0 to − 3.2 eV. Interestingly, when the polymers were used as donor materials in bulk‐heterojunction photovoltaic cells with PC ₇₁ BM as the electron‐acceptor, the benzobisoxazole‐based polymers gave slightly better results than the benzobisthiazole‐containing polymers with power conversion efficiencies up to 3.5%. These results indicate that benzobisoxazoles are promising materials for use in OPVs. © 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2015 , 53 , 1533–1540

View Accepted Manuscript (Publisher)

Sponsoring Organization:: USDOE

Grant/Contract Number:: NONE; SC0001087

OSTI ID:: 1400912

Alternate ID(s):: OSTI ID: 1370305

Journal Information:: Journal of Polymer Science. Part A, Polymer Chemistry, Journal Name: Journal of Polymer Science. Part A, Polymer Chemistry Journal Issue: 13 Vol. 53; ISSN 0887-624X

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: United States

Language:: English

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