Critical Role of Pendant Group Substitution on the Performance of Efficient All-Polymer Solar Cells

Kedar D. Deshmukh, Shyamal K K Prasad, Naresh Chandrasekaran, Amelia C. Y. Liu, Eliot Gann, Lars Thomsen, Dinesh Kabra, Justin M. Hodgkiss, Christopher R. McNeill

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Most high-performance all-polymer solar cell systems employ donor polymers with side groups containing bulky aromatic units. The rationale behind the use of bulky side groups in efficient all-polymer systems, however, is not well-understood. In this study, we investigate the doubling of power conversion efficiency in all-polymer solar cells that occurs when substituting the pendant oxygen group in polymer donor PTB7 for thiophene. Specifically, polymer blends using either PTB7 or PTB7-Th as donor with P(NDI2OD-T2) as acceptor are compared. We comprehensively examine the photophysics, morphology, and device physics of these two systems and find that PTB7-Th:P(NDI2OD-T2) blends have suppressed geminate recombination and improved charge collection efficiencies compared to PTB7:P(NDI2OD-T2) blends. While the switching of oxygen for thiophene does not have a dramatic effect on blend morphology, the bulky side group in PTB7-Th helps to destabilize the interfacial charge transfer state, with 5-fold higher hole mobility of PTB7-Th also resulting in improved charge collection.

Original languageEnglish
Pages (from-to)804-816
Number of pages13
JournalChemistry of Materials
Volume29
Issue number2
DOIs
Publication statusPublished - 24 Jan 2017

Cite this

Deshmukh, Kedar D. ; Prasad, Shyamal K K ; Chandrasekaran, Naresh ; Liu, Amelia C. Y. ; Gann, Eliot ; Thomsen, Lars ; Kabra, Dinesh ; Hodgkiss, Justin M. ; McNeill, Christopher R. / Critical Role of Pendant Group Substitution on the Performance of Efficient All-Polymer Solar Cells. In: Chemistry of Materials. 2017 ; Vol. 29, No. 2. pp. 804-816.
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Critical Role of Pendant Group Substitution on the Performance of Efficient All-Polymer Solar Cells. / Deshmukh, Kedar D.; Prasad, Shyamal K K; Chandrasekaran, Naresh; Liu, Amelia C. Y.; Gann, Eliot; Thomsen, Lars; Kabra, Dinesh; Hodgkiss, Justin M.; McNeill, Christopher R.

In: Chemistry of Materials, Vol. 29, No. 2, 24.01.2017, p. 804-816.

Research output: Contribution to journalArticleResearchpeer-review

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