Rational Design of Dopant-Free Coplanar D-π-D Hole-Transporting Materials for High-Performance Perovskite Solar Cells with Fill Factor Exceeding 80%

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

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Author(s)

  • Yatong Chen
  • Ning Cai
  • Sainan Qian
  • Ruixi Luo
  • Yanping Huo

Detail(s)

Original languageEnglish
Article number1901268
Journal / PublicationAdvanced Energy Materials
Volume9
Issue number39
Online published7 Aug 2019
Publication statusPublished - 17 Oct 2019

Abstract

In this paper, two novel D-π-D hole-transporting materials (HTM) are reported, abbreviated as BDT-PTZ and BDT-POZ, which consist of 4,8-di(hexylthio)-benzo[1,2-b:4,5-b′]dithiophene (BDT) as π-conjugated linker, and N-(6-bromohexyl) phenothiazine (PTZ)/N-(6-bromohexyl) phenoxazine (POZ) as donor units. The above two HTMs are deployed in p-i-n perovskite solar cells (PSCs) as dopant-free HT layers, exhibiting excellent power conversion efficiencies of 18.26% and 19.16%, respectively. Particularly, BDT-POZ demonstrates a superior fill factor of 81.7%, which is consistent with its more efficient hole extraction and transport verified via steady-state/transient fluorescence spectra and space-charge-limited current technique. Single-crystal X-ray diffraction characterization implies these two molecules present diverse packing tendencies, which may account for various interfacial hole-transport ability in PSCs.

Research Area(s)

  • dopant free, hole mobility, hole-transporting materials, molecular packing, perovskite solar cells

Citation Format(s)

Rational Design of Dopant-Free Coplanar D-π-D Hole-Transporting Materials for High-Performance Perovskite Solar Cells with Fill Factor Exceeding 80%. / Chen, Yatong; Xu, Xiuwen; Cai, Ning; Qian, Sainan; Luo, Ruixi; Huo, Yanping; Tsang, Sai-Wing.

In: Advanced Energy Materials, Vol. 9, No. 39, 1901268, 17.10.2019.

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