Siloxane-functional small molecule acceptor for high-performance organic solar cells with 16.6% efficiency

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Qunping Fan
  • Jianqiu Wang
  • Wenyan Su
  • Feng Liu
  • Maojie Zhang
  • Yongfang Li

Related Research Unit(s)

Detail(s)

Original languageEnglish
Article number136018
Journal / PublicationChemical Engineering Journal
Volume442
Online published26 Mar 2022
Publication statusPublished - 15 Aug 2022

Abstract

As one of the simple but most effective molecular design strategies, side-chain engineering has been widely employed to modify the photoelectric properties of active layer materials for boosting the photovoltaic performance of organic solar cells (OSCs). Herein, a functionalized small molecule acceptor (SMA) named BTSi-4F with a bulky siloxane-terminated solubilizing group as side-chains, derived from a classical SMA of Y6, was designed and synthesized. The results demonstrate that the introduction of siloxane-functional terminated groups into SMA not only affects the optical absorption and molecular energy levels, but also regulates the miscibility between the polymer donor and SMA. Compared to the original Y6, BTSi-4F exhibits a better solubility, upshifted lowest unoccupied molecular orbital (LUMO) energy level, more ordered molecular packing, and higher electron-mobility. Matched with a wide bandgap polymer donor PM6, the chlorobenzene-processed OSCs based on PM6:BTSi-4F achieved a superior power conversion efficiency (PCE) of 16.6% with both high open-circuit voltage (Voc) of 0.90 V and high fill factor (FF) of 0.77, while the devices based on PM6:Y6 obtained a much lower PCE of 13.0% with a Voc of 0.81 V and FF of 0.69 under the same conditions. This work offers a promising molecular design strategy of siloxane-terminated side chain engineering to develop high-performance SMAs for efficient OSCs.

Research Area(s)

  • Miscibility, Organic solar cells, Power conversion efficiency, Siloxane-terminated side-chains, Small molecular acceptor

Citation Format(s)

Siloxane-functional small molecule acceptor for high-performance organic solar cells with 16.6% efficiency. / Yin, Zhihong; Guo, Xia; Wang, Yang; Zhu, Lei; Chen, Yuhao; Fan, Qunping; Wang, Jianqiu; Su, Wenyan; Liu, Feng; Zhang, Maojie; Li, Yongfang.

In: Chemical Engineering Journal, Vol. 442, 136018, 15.08.2022.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review