Enhanced Performance of Organic Solar Cells with Increased End Group Dipole Moment in Indacenodithieno[3,2-b]thiophene-Based Molecules

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

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Author(s)

  • Jeremy J. Intemann
  • Kai Yao
  • Feizhi Ding
  • Yunxiang Xu
  • Xukai Xin
  • Xiaosong Li

Detail(s)

Original languageEnglish
Pages (from-to)4889-4897
Journal / PublicationAdvanced Functional Materials
Volume25
Issue number30
Publication statusPublished - 1 Aug 2015
Externally publishedYes

Abstract

Four new molecular donors are reported using a D1-A-D2-A-D1 structure, where D1 is an oligiothiophene, A is a benzothiadiazole, and D2 is indacenodithieno[3,2-b]thiophene. The resulting materials provide efficiencies as high as 6.5% in organic solar cells, without the use of solvent additives or thermal/solvent annealing. A strong correlation between the end group (D1-A) dipole moment and the fill factor (FF), mobility, and loss in the open-circuit voltage (VOC) is observed. Indacenodithieno[3,2-b]thiophene-fluorobenzothiadiazole-terthiophene (IDTT-FBT-3T) possesses the largest end group dipole moment, and in turn, has the highest mobility, FF, and power conversion efficiency in devices. It also has a similarly high VOC (0.95 V) to the other materials (0.93-0.99 V), despite possessing a much higher highest occupied molecular orbital (HOMO) energy level.

Research Area(s)

  • organic electronics, photovolatic devices, semiconducting molecules

Citation Format(s)

Enhanced Performance of Organic Solar Cells with Increased End Group Dipole Moment in Indacenodithieno[3,2-b]thiophene-Based Molecules. / Intemann, Jeremy J.; Yao, Kai; Ding, Feizhi; Xu, Yunxiang; Xin, Xukai; Li, Xiaosong; Jen, Alex K.-Y.

In: Advanced Functional Materials, Vol. 25, No. 30, 01.08.2015, p. 4889-4897.

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