Near-infrared absorbing polymer acceptors enabled by selenophene-fused core and halogenated end-group for binary all-polymer solar cells with efficiency over 16%

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

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Author(s)

  • Qunping Fan
  • Huiting Fu
  • Zhenghui Luo
  • Jiyeon Oh
  • Baobing Fan
  • Francis Lin
  • Changduk Yang

Detail(s)

Original languageEnglish
Article number106718
Journal / PublicationNano Energy
Volume92
Online published12 Nov 2021
Publication statusPublished - Feb 2022

Abstract

Due to the vigorous development of polymerized small-molecule acceptors (PSMAs), all-polymer solar cells (all-PSCs) have made tremendous advancement recently. However, their power conversion efficiencies (PCEs) are still restricted by the lack of PSMAs with desirable optoelectronic properties, especially the ability to capture the near-infrared photons. To resolve this, two near-infrared absorbing PSMAs, namely PY2Se-F and PY2Se-Cl, with a selenophene-fused core and halogenated end-group are developed. Combining the synergistic effects of selenium and fluorine (F)/chlorine (Cl) substitutions in broadening absorption and enhancing intermolecular interactions, PY2Se-F and PY2Se-Cl show significantly red-shifted absorption (30–40 nm) and reasonably deep-shifted lowest unoccupied molecular orbital (LUMO) levels compared with the pristine PY2S-H and fluorinated PY2S-F. When replacing F with Cl on the end-group, the PY2Se-Cl shows a better blend morphology with polymer donor PM6, compared with the PY2Se-F-based one, leading to better charge transport. As a result, the PM6:PY2Se-Cl-based all-PSCs achieve an impressive PCE of 16.1% with both high short-circuit current density (Jsc) of 24.5 mA cm−2 and fill factor (FF) of 0.743, which are among the highest values in the reported binary all-PSCs so far. Notably, this is the first example of chlorinated end-group derived PSMAs. Combining with the low-cost merit of chlorination, PY2Se-Cl shows great potential in the practical applications of efficient all-PSCs.

Research Area(s)

  • All-polymer solar cells, Halogenation, Near-infrared absorbing polymer acceptors, Power conversion efficiencies, Selenophene

Citation Format(s)

Near-infrared absorbing polymer acceptors enabled by selenophene-fused core and halogenated end-group for binary all-polymer solar cells with efficiency over 16%. / Fan, Qunping; Fu, Huiting; Luo, Zhenghui; Oh, Jiyeon; Fan, Baobing; Lin, Francis; Yang, Changduk; Jen, Alex K.-Y.

In: Nano Energy, Vol. 92, 106718, 02.2022.

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