Efficient ternary bulk heterojunction solar cells with PCDTBT as hole-cascade material

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

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Author(s)

  • Yubin Xiao
  • Han Wang
  • Shuang Zhou
  • Keyou Yan
  • Weiguang Xie
  • Zhiqiang Guan
  • Jian-Bin Xu

Detail(s)

Original languageEnglish
Pages (from-to)476-485
Journal / PublicationNano Energy
Volume19
Online published29 Nov 2015
Publication statusPublished - Jan 2016

Abstract

Ternary bulk hetero-junction (BHJ) architecture for organic solar cells has been developed to enhance the power conversion efficiency (PCE) by expanding the light absorption range and smoothing the energy level at the BHJ interface. In this work, we report on a ternary polymer blend solar cell with two donor materials, polythieno[3,4-b]-thiophene/benzodithiophene (PTB7), poly[N-9"-hepta-decanyl-2,7-carbazole-alt-5,5-(4',7'-di-2-thienyl-2',1',3'-benzothiadiazole) (PCDTBT), and using C71-butyric acid methyl ester (PC71BM) as acceptor material. The resultant device shows an optimized PCE of 7.81% (control sample, 7.06%), with an open circuit voltage (Voc) of 0.76V, a short circuit current (Jsc) of 15.4mA/cm2 and a fill factor (FF) of 66.7%. The improved device performance is mainly attributed to the enhanced charge separation, improved hole mobility, and better film morphology. And we find that the third component PCDTBT can reduce charge recombination in the ternary blend system as well. The results bring new insight into the future development of high efficiency ternary organic solar cells.

Research Area(s)

  • BHJ, Energy level, Ternary polymer solar cells, Work function pinning

Citation Format(s)

Efficient ternary bulk heterojunction solar cells with PCDTBT as hole-cascade material. / Xiao, Yubin; Wang, Han; Zhou, Shuang; Yan, Keyou; Xie, Weiguang; Guan, Zhiqiang; Tsang, Sai-Wing; Xu, Jian-Bin.

In: Nano Energy, Vol. 19, 01.2016, p. 476-485.

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