Fluorinated oligothiophene donors for high-performance nonfullerene small-molecule organic solar cells

Tongle Xu, Yuying Chang, Cenqi Yan, Qianguang Yang, Zhipeng Kan, Ranbir Singh, Manish Kumar, Gang Li, Shirong Lu, Tainan Duan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

3 Citations (Scopus)

Abstract

Thiophene is widely used in organic photovoltaics due to its excellent charge transport properties, simple synthesis, and high stability. In this paper, two simple oligothiophenes, namely,DC5Tand2FDC5Twith rhodanine-flanked structures were synthesized and used as donors in nonfullerene small-molecule organic solar cells (NSM-OSCs). Compared toDC5T,2FDC5Twith fluorine atoms substituted on the conjugated backbone exhibited a downshifted highest occupied molecular orbital (HOMO) energy level and blue-shifted light absorption. WithIDIC-4Fas a small-molecule acceptor, the2FDC5T-based device exhibited much higher short-circuit current density and open-circuit voltage than theDC5T-based device. As a result, a promising power conversion efficiency (PCE) of 9.02% was achieved for the2FDC5T/IDIC-4Fdevice, which was 28% higher than that of theDC5T/IDIC-4Fdevice (PCE = 7.03%). Further research indicated that fluorination on the oligothiophene donor assisted the optimization of the active layer morphology and the reduction in the trap-assisted recombination in the device, which could deeply explain the improvement in efficiency.

Original languageEnglish
Pages (from-to)2680-2685
Number of pages6
JournalSustainable Energy and Fuels
Volume4
Issue number6
DOIs
Publication statusPublished - Jun 2020

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Energy Engineering and Power Technology

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