Rational Design of Cyclopenta[2,1-b;3,4-b′]dithiophene-bridged Hole Transporting Materials for Highly Efficient and Stable Perovskite Solar Cells

Yan Duo Lin, Kun Mu Lee, Bo Yu Ke, Kai Shiang Chen, Hao Chien Cheng, Wei Juih Lin, Sheng Hsiung Chang, Chun Guey Wu, Ming Chung Kuo, Hsin Cheng Chung, Chien Chun Chou, Heng Yu Chen, Kang Ling Liau, Tahsin J. Chow, Shih Sheng Sun

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

A series of small-molecule-based hole-transporting materials (HTMs) featuring a 4H-cyclopenta[2,1-b : 3,4-b′]dithiophene as the central core with triphenylamine- and carbazole-based side groups was synthesized and evaluated for perovskite solar cells. The correlations of the chemical structure of the HTMs on the photovoltaic performance were explored through different combinations of the central π-bridge moieties. The optical and electrochemical properties, energy levels, and hole mobility were systematically investigated, revealing the significant influence of the central core planarity and packing structure on their photovoltaic performance. The optimized device based on CT1 exhibited a PCE (power conversion efficiency) of 17.71 % with a device architecture of FTO/TiO 2 compact layer/TiO 2 mesoporous/CH 3 NH 3 PbI 3 /HTM/MoO 3 /Ag, which was found to be on par with that of a cell fabricated based on state-of-the-art spiro-OMeTAD (16.97 %) as HTM. Moreover, stability assessment showed an improved stability for CPDT-based HTMs in comparison with spiro-OMeTAD over 1300 h.

Original languageEnglish
Pages (from-to)307-316
Number of pages10
JournalEnergy Technology
Volume7
Issue number2
DOIs
StatePublished - Feb 2019

Keywords

  • cyclopenta[2,1-b;3,4-b′]dithiophene
  • hole transporting materials
  • long-term stability
  • perovskite solar cell

Fingerprint

Dive into the research topics of 'Rational Design of Cyclopenta[2,1-b;3,4-b′]dithiophene-bridged Hole Transporting Materials for Highly Efficient and Stable Perovskite Solar Cells'. Together they form a unique fingerprint.

Cite this