Regulating the Aggregation of Unfused Non-Fullerene Acceptors via Molecular Engineering towards Efficient Polymer Solar Cells

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

2 Scopus Citations
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Author(s)

  • Yuxiang Li
  • Huiting Fu
  • Ziang Wu
  • Mei Wang
  • Hongmei Qin
  • Francis Lin
  • Han Young Woo

Detail(s)

Original languageEnglish
Pages (from-to)3579-3589
Journal / PublicationChemSusChem
Volume14
Issue number17
Online published26 May 2021
Publication statusPublished - 6 Sep 2021

Abstract

Tuning molecular aggregation via structure design to manipulate the film morphology still remains as a challenge for polymer solar cells based on unfused non-fullerene acceptors (UF-NFAs). Herein, a strategy was developed to modulate the aggregation patterns of UF-NFAs by systematically varying the pi-bridge (D) unit and central core (A') unit in A-D-A'-D-A framework (A and D refer to electron-withdrawing and electron-donating moieties, respectively). Specifically, the quantified contents of H- or J-aggregation and crystallite disorder of three UF-NFAs (BDIC2F, BCIC2F, and TCIC2F) were analyzed via UV/Vis spectrometry and grazing incidence X-ray scattering. The results showed that the H-aggregate-dominated BCIC2F with less crystallite disorder exhibited a more favorable blend morphology with polymer donor PBDB-T (poly[(2,6-(4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b:4,5-b']dithiophene)-co-(1,3-di(5-thiophene-2-yl)-5,7-bis(2-ethylhexyl)benzo[1,2-c:4,5-c']dithiophene-4,8-dione)]) relative the other two UF-NFAs, resulting in improved exciton dissociation and charge tranport. Consequently, photovoltaic devices based on BCIC2F delivered a promising power conversion efficiency of 12.4 % with an exceptionally high short-circuit current density of 22.1 mA cm-2.

Research Area(s)

  • aggregation, morphology, organic semiconductors, photovoltaics, solar cells, ELECTRON-ACCEPTORS, STRATEGY, PACKING, DESIGN

Citation Format(s)

Regulating the Aggregation of Unfused Non-Fullerene Acceptors via Molecular Engineering towards Efficient Polymer Solar Cells. / Li, Yuxiang; Fu, Huiting; Wu, Ziang; Wu, Xin; Wang, Mei; Qin, Hongmei; Lin, Francis; Woo, Han Young; Jen, Alex K-Y.

In: ChemSusChem, Vol. 14, No. 17, 06.09.2021, p. 3579-3589.

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