Dopant-Free Hole Transporting Molecules for Highly Efficient Perovskite Photovoltaic with Strong Interfacial Interaction

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

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Author(s)

  • Fanxu Meng
  • Yu Jia
  • Jiantao Wang
  • Xiaoyu Huang
  • Zhigang Gui
  • Li Huang
  • Ruxue Li
  • Rui Chen
  • Jing Xu
  • Wei Chen
  • Zhubing He
  • Enwei Zhu
  • Guangbo Che
  • Hsing-Lin Wang

Related Research Unit(s)

Detail(s)

Original languageEnglish
Article number1900319
Journal / PublicationSolar RRL
Volume3
Issue number12
Online published19 Sep 2019
Publication statusPublished - Dec 2019

Abstract

One of the attractive ways to develop efficient and cost-effective inverted perovskite solar cells (PVSCs) is through the use of dopant-free hole transporting materials (HTMs) with facile synthesis and a lower price tag. Herein, two organic small molecules with a fluorene core are presented as dopant-free HTMs in inverted PVSCs, namely, FB-OMeTPA and FT-OMeTPA. The two molecules are designed in such a way they differ by replacing one of the benzene rings (FB-OMeTPA) with thiophene (FT-OMeTPA), which leads to a significantly improved coplanarity as manifested in the redshift of the absorbance and a smaller bandgap energy. Density functional theory calculations show that FT-OMeTPA has a strong Pb2+-S interaction at the FT-OMeTPA/perovskite interface, allowing surface passivation and facilitating charge transfer across interfaces. As a result, the PVSCs based on FT-OMeTPA exhibit a much higher hole mobility, power conversion efficiency, operational stability, and less hysteresis as compared with devices based on FB-OMeTPA.

Research Area(s)

  • dopant-free, hole transporting materials, interfacial interactions, inverted perovskite photovoltaics, p-i-n, SOLAR-CELLS, STABILITY, LAYER

Citation Format(s)

Dopant-Free Hole Transporting Molecules for Highly Efficient Perovskite Photovoltaic with Strong Interfacial Interaction. / Meng, Fanxu; Jia, Yu; Wang, Jiantao; Huang, Xiaoyu; Gui, Zhigang; Huang, Li; Li, Ruxue; Chen, Rui; Xu, Jing; Chen, Wei; He, Zhubing; Hsu, Hsien-Yi; Zhu, Enwei; Che, Guangbo; Wang, Hsing-Lin.

In: Solar RRL, Vol. 3, No. 12, 1900319, 12.2019.

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