A new quinoxaline and isoindigo based polymer as donor material for solar cells: Role of ecofriendly processing solvents on the device efficiency and stability

Mirko Seri, Desta Gedefaw, Mario Prosa, Marta Tessarolo, Margherita Bolognesi, Michele Muccini, Mats R. Andersson

    Research output: Contribution to journalArticlepeer-review

    11 Citations (Scopus)

    Abstract

    A new semiconducting polymer based on two different electron deficient (quinoxaline and isoindigo) and electron rich (benzodithiophene) moieties is synthesized, characterized and used as donor material for photovoltaic devices. Blade-coated bulk heterojunction solar cells are fabricated in air by using chlorinated (o-dichlorobenzene) and nonchlorinated (o-xylene) solvents for the deposition of the active layer. The use of o-xylene allows a ∼10% improvement of the device efficiency in comparison to the analogous system processed from o-dichlorobenzene. In addition, the evolution of the photovoltaic parameters of the resulting devices during thermal stress is monitored and compared, demonstrating a nearly identical resistance against temperature. The reported results not only highlight the promising properties of the new polymer in terms of environmental stability and compatibility with nonhalogenated solvents, but also show an easy and ecofriendly way to further improve the device performance without altering the corresponding thermal stability.

    Original languageEnglish
    Pages (from-to)234-242
    Number of pages9
    JournalJournal of Polymer Science Part A: Polymer Chemistry
    Volume55
    Issue number2
    DOIs
    Publication statusPublished - 15 Jan 2017

    Keywords

    • BHJ solar cells
    • donor polymer
    • nonchlorinated processing solvent
    • thermal stability

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