Effects of a Molecular Monolayer Modification of NiO Nanocrystal Layer Surfaces on Perovskite Crystallization and Interface Contact toward Faster Hole Extraction and Higher Photovoltaic Performance

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

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Author(s)

  • Yang Bai
  • Haining Chen
  • Shuang Xiao
  • Qifan Xue
  • Teng Zhang
  • Qiang Li
  • Chen Hu
  • Yun Yang
  • Zhicheng Hu
  • Fei Huang
  • Kam Sing Wong
  • Hin-Lap Yip
  • Shihe Yang

Detail(s)

Original languageEnglish
Pages (from-to)2950-2958
Journal / PublicationAdvanced Functional Materials
Volume26
Issue number17
Online published2 Mar 2016
Publication statusPublished - 3 May 2016
Externally publishedYes

Abstract

NiO is a promising hole transporting material for perovskite solar cells due to its high hole mobility, good stability, easy processibility, and suitable Fermi level for hole extraction. However, the efficiency of NiO-based cells is still limited by the slow hole extraction due to the poor perovskite/NiO interface and the inadequate quality of the two solution-processed material phases. Here, large influences of a monolayer surface modification of NiO nanocrystal layers with ethanolamine molecules are demonstrated on the enhancement of hole extraction/transport and thus the photovoltaic performance. The underlying causes have been revealed by a series of studies, pointing to a favorable dipole layer formed by the molecular adsorption along with the enhanced perovskite crystallization and the improved interface contact. Comparatively, the solar cells based on a diethanolamine-modified NiO layer have achieved a rather high fill factor, indeed one of the highest among NiO-based perovskite solar cells, and high short-circuit photocurrent density (Jsc), resulting in a power conversion efficiency of ≈16%, most importantly, without hysteresis.

Research Area(s)

  • hole extraction, hole transport layer, perovskite solar cell, surface modification

Citation Format(s)

Effects of a Molecular Monolayer Modification of NiO Nanocrystal Layer Surfaces on Perovskite Crystallization and Interface Contact toward Faster Hole Extraction and Higher Photovoltaic Performance. / Bai, Yang; Chen, Haining; Xiao, Shuang; Xue, Qifan; Zhang, Teng; Zhu, Zonglong; Li, Qiang; Hu, Chen; Yang, Yun; Hu, Zhicheng; Huang, Fei; Wong, Kam Sing; Yip, Hin-Lap; Yang, Shihe.

In: Advanced Functional Materials, Vol. 26, No. 17, 03.05.2016, p. 2950-2958.

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