Synergistical Dipole–Dipole Interaction Induced Self-Assembly of Phenoxazine-Based Hole-Transporting Materials for Efficient and Stable Inverted Perovskite Solar Cells

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

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Author(s)

  • Ning Cai
  • Yatong Chen
  • Ruixi Luo
  • Tonghui Hu
  • Francis Lin
  • Shek-Man Yiu
  • Danjun Liu

Detail(s)

Original languageEnglish
Pages (from-to)20437-20442
Journal / PublicationAngewandte Chemie - International Edition
Volume60
Issue number37
Online published5 Jul 2021
Publication statusPublished - 6 Sep 2021

Abstract

Delicately designed dopant-free hole-transporting materials (HTMs) with ordered structure have become one of the major strategies to achieve high-performance perovskite solar cells (PSCs). In this work, we report two donor-π linker-donor (D-π-D) HTMs, N01 and N02, which consist of facilely synthesized 4,8-di(n-hexyloxy)-benzo[1,2-b:4,5-b′]dithiophene as a π linker, with 10-bromohexyl-10H-phenoxazine and 10-hexyl-10H-phenoxazine as donors, respectively. The N01 molecules form a two-dimensional conjugated network governed by C−H⋅⋅⋅O and C−H⋅⋅⋅Br interaction between phenoxazine donors, and synchronously construct a three-dimension lamellar structure with the aid of interlaminar π–π interaction. Consequently, N01 as a dopant-free small-molecule HTM exhibits a higher intrinsic hole mobility and more favorable interfacial properties for hole transport, hole extraction and perovskite growth, enabling an inverted PSC to achieve a very impressive power conversion efficiency of 21.85 %.

Research Area(s)

  • inverted perovskite solar cells, noncovalent interactions, phenoxazine, self-assembly, semiconductors

Citation Format(s)

Synergistical Dipole–Dipole Interaction Induced Self-Assembly of Phenoxazine-Based Hole-Transporting Materials for Efficient and Stable Inverted Perovskite Solar Cells. / Cai, Ning; Li, Fengzhu; Chen, Yatong; Luo, Ruixi; Hu, Tonghui; Lin, Francis; Yiu, Shek-Man; Liu, Danjun; Lei, Dangyuan; Zhu, Zonglong; Jen, Alex K.-Y.

In: Angewandte Chemie - International Edition, Vol. 60, No. 37, 06.09.2021, p. 20437-20442.

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