Polyfluorene derivatives are high-performance organic hole-transporting materials for inorganic-organic hybrid perovskite solar cells

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

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Author(s)

  • Yang Bai
  • Harrison Ka Hin Lee
  • Cheng Mu
  • Teng Zhang
  • Lixia Zhang
  • Jiannong Wang
  • He Yan
  • Shu Kong So
  • Shihe Yang

Detail(s)

Original languageEnglish
Pages (from-to)7357-7365
Journal / PublicationAdvanced Functional Materials
Volume24
Issue number46
Online published11 Sep 2014
Publication statusPublished - 10 Dec 2014
Externally publishedYes

Abstract

Photovoltaics based on organic-inorganic perovskites offer new promise to address the contemporary energy and environmental issues. These solar cells have so far largely relied on small-molecule hole transport materials such as spiro-OMeTAD, which commonly suffer from high cost and low mobility. In principle, polyfl uorene copolymers can be an ideal alternative to spiro- OMeTAD, given their low price, high hole mobility and good processability, but this potential has not been explored. Herein, polyfl uorene derived polymers- TFB and PFB, which contain fl uorine and arylamine groups, are demonstrated and can indeed rival or even outperform spiro-OMeTAD as efficient holeconducting materials for perovskite solar cells. In particular, under the one-step perovskite deposition condition, TFB achieves a 10.92% power conversion efficiency that is considerably higher than that with spiro-OMeTAD (9.78%), while using the two-step perovskite deposition method, about 13% efficient solar cells with TFB (12.80%) and spiro-OMeTAD (13.58%) are delivered. Photoluminescence reveals the efficient hole extraction and diffusion at the interface between CH 3 NH 3 PbI 3 and the hole conducting polymer. Impedance spectroscopy uncovers the higher electrical conductivity and lower series resistance than spiro-OMeTAD, accounting for the signifi cantly higher fi ll factor, photocurrent and open-circuit voltage of the TFB-derived cells than with spiro-MeOTAD.

Research Area(s)

  • perovskite solar cells, polyfluorene derivatives, hole‐transporting materials

Citation Format(s)

Polyfluorene derivatives are high-performance organic hole-transporting materials for inorganic-organic hybrid perovskite solar cells. / Zhu, Zonglong; Bai, Yang; Lee, Harrison Ka Hin; Mu, Cheng; Zhang, Teng; Zhang, Lixia; Wang, Jiannong; Yan, He; So, Shu Kong; Yang, Shihe.

In: Advanced Functional Materials, Vol. 24, No. 46, 10.12.2014, p. 7357-7365.

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