High-Crystallinity π-Conjugated Small Molecules Based on Thienylene-Vinylene-Thienylene: Critical Role of Self-Organization in Photovoltaic, Charge-Transport, and Morphological Properties

Seiichi Furukawa, Hideaki Komiyama, Naoya Aizawa, Takuma Yasuda

    Research output: Contribution to journalArticlepeer-review

    8 Citations (Scopus)

    Abstract

    Narrow-band-gap small molecules with π-extended backbones are promising donor materials for solution-processed bulk-heterojunction (BHJ) organic solar cells (OSCs). Herein, a series of acceptor-donor-acceptor (A-D-A) photovoltaic small molecules incorporating thienylene-vinylene-thienylene (TVT) as a central D unit and alkyl-substituted rhodanine or 2-(1,1-dicyanomethylene)rhodanine as terminal A units are designed and synthesized. Their physical properties including photoabsorption, electronic energy levels, hole mobility, and morphological characteristics are systematically investigated. Using solvent vapor annealing (SVA), the morphologies of the BHJ photoactive layers composed of these small-molecule donors and a [6,6]-phenyl-C 71 -butyric acid methyl ester (PC 71 BM) acceptor can be properly modulated. As a result of increased crystallinity of the donors and desired phase segregation between the donors and PC 71 BM upon rapid SVA treatment, the photovoltaic performances of the resultant OSC devices undergo drastic enhancement. The results reported here indicate that high-efficiency small-molecule OSCs can be achieved through rational design of the TVT-based molecular framework and optimization of the nanoscale phase-segregated morphology via proper SVA treatment.

    Original languageEnglish
    Pages (from-to)42756-42765
    Number of pages10
    JournalACS Applied Materials and Interfaces
    Volume10
    Issue number49
    DOIs
    Publication statusPublished - Dec 12 2018

    All Science Journal Classification (ASJC) codes

    • General Materials Science

    Fingerprint

    Dive into the research topics of 'High-Crystallinity π-Conjugated Small Molecules Based on Thienylene-Vinylene-Thienylene: Critical Role of Self-Organization in Photovoltaic, Charge-Transport, and Morphological Properties'. Together they form a unique fingerprint.

    Cite this