2-Dimensional cross-shaped tetrathienonaphthalene-based ladder-type acceptor for high-efficiency organic solar cells

Shao Ling Chang, Fong Yi Cao, Kuo Hsiu Huang, Wei Liang Lee, Meng Hsun Lee, Chain Shu Hsu, Chain Shu Hsu, Yen Ju Cheng, Yen Ju Cheng

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    6 Scopus citations

    Abstract

    An NC-FIC nonfullerene acceptor, using a didodecylnaphthodithiophene (NDT) embedded octacyclic ladder-type donor NC, had been described previously. In this work, a new cross-shaped TC-FIC nonfullerene acceptor is designed by substitution of the NDT unit in the NC skeleton with a 2-dimensional didodecyltetrathienonaphthalene (TTN) unit. The 2-dimensional TC π-system with two vertically fused thiophenes strengthens the electron-donating ability, promotes π-electron delocalization and enhances intramolecular donor-acceptor charge transfer and intermolecular π-π interactions. As a result, TC-FIC shows more red-shifted and widened absorption compared to the NC-FIC counterpart. The PBDB-T:TC-FIC device exhibits a higher efficiency of 11.6% which greatly outperformed the corresponding PBDB-T:NC-FIC device with an efficiency of 7.52%. The dramatic 54% enhancement in efficiency is ascribed to the improved light-harvesting ability and enhanced charge mobilities which are benefited from the central 2-dimensional TTN moiety. By incorporating PC71BM to improve absorption and electron transport, the ternary-blend PBDB-T : TC-FIC : PC71BM device (1 : 1 : 1 in wt%) achieves a highest PCE of 13.49% with an enhanced Jsc of 23.80 mA cm-2, an FF of 64.4%, and a Voc of 0.88 V. This journal is

    Original languageEnglish
    Pages (from-to)12141-12148
    Number of pages8
    JournalJournal of Materials Chemistry A
    Volume8
    Issue number24
    DOIs
    StatePublished - 28 Jun 2020

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