Enhancing the Performance of Polymer Solar Cells via Core Engineering of NIR-Absorbing Electron Acceptors

Shuixing Dai, Tengfei Li, Wei Wang, Yiqun Xiao, Tsz Ki Lau, Zeyuan Li, Kuan Liu, Xinhui Lu, Xiaowei Zhan

    Research output: Journal article publicationJournal articleAcademic researchpeer-review

    309 Citations (Scopus)

    Abstract

    In order to utilize the near-infrared (NIR) solar photons like silicon-based solar cells, extensive research efforts have been devoted to the development of organic donor and acceptor materials with strong NIR absorption. However, single-junction organic solar cells (OSCs) with photoresponse extending into >1000 nm and power conversion efficiency (PCE) >11% have rarely been reported. Herein, three fused-ring electron acceptors with varying core size are reported. These three molecules exhibit strong absorption from 600 to 1000 nm and high electron mobility (>1 × 10−3 cm2 V−1 s−1). It is proposed that core engineering is a promising approach to elevate energy levels, enhance absorption and electron mobility, and finally achieve high device performance. This approach can maximize both short-circuit current density (JSC) and open-circuit voltage (VOC) at the same time, differing from the commonly used end group engineering that is generally unable to realize simultaneous enhancement in both VOC and JSC. Finally, the single-junction OSCs based on these acceptors in combination with the widely polymer donor PTB7-Th yield JSC as high as 26.00 mA cm−2 and PCE as high as 12.3%.

    Original languageEnglish
    Article number1706571
    JournalAdvanced Materials
    Volume30
    Issue number15
    DOIs
    Publication statusPublished - 12 Apr 2018

    Keywords

    • core engineering
    • fused-ring electron acceptor
    • NIR absorption
    • nonfullerene
    • polymer solar cell

    ASJC Scopus subject areas

    • General Materials Science
    • Mechanics of Materials
    • Mechanical Engineering

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