Di-Spiro-Based Hole-Transporting Materials for Highly Efficient Perovskite Solar Cells

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

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Author(s)

  • Ke Gao
  • Bo Xu
  • Chaoshen Hong
  • Xueliang Shi
  • Hongbin Liu
  • Xiaosong Li
  • Linghai Xie

Detail(s)

Original languageEnglish
Article number1800809
Journal / PublicationAdvanced Energy Materials
Volume8
Issue number22
Early online date21 May 2018
Publication statusPublished - 6 Aug 2018

Abstract

Hole-transporting materials (HTMs) are essential for enabling highly efficient perovskite solar cells (PVSCs) to extract and transport the hole carriers. Among numerous HTMs that are studied so far, the single-spiro-based compounds are the most frequently used HTMs for achieving highly efficient PVSCs. In fact, all the new spiro-based HTMs reported so far that render PVSCs over 20% are based on spiro[fluorene-9,9′-xanthene] or spiro [cyclopenta [2,1-b:3,4b′]dithiophene-4,9′-fluorene] cores; therefore, there is a need to diversify the design of their structures for further improving their function and performance. In addition, the fundamental understanding of structure-performance relationships for the spiro-based HTMs is still lagging, for example, how molecular configuration, spiro numbers, and heteroatoms in spiro-rings impact the efficacy of HTMs. To address these needs, two novel H-shaped HTMs, G1 and G2 based on the di-spiro-rings as the cores are designed and synthesized. The combined good film-forming properties, better interactions with perovskite, slightly deeper highest occupied molecular orbital, higher mobility and conductivity, as well as more efficient charge transfer for G2 help devices reach a very impressive power conversion efficiency of 20.2% and good stability. This is the first report of demonstrating the feasibility of using di-spiro-based HTMs for highly efficient PVSCs.

Research Area(s)

  • Binding energy, Di-spiro, High efficiency, Hole-transporting materials, Perovskite solar cells

Citation Format(s)

Di-Spiro-Based Hole-Transporting Materials for Highly Efficient Perovskite Solar Cells. / Gao, Ke; Xu, Bo; Hong, Chaoshen; Shi, Xueliang; Liu, Hongbin; Li, Xiaosong; Xie, Linghai; Jen, Alex K-Y.

In: Advanced Energy Materials, Vol. 8, No. 22, 1800809, 06.08.2018.

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