Document Type

Journal Article

Department/Unit

Department of Physics

Title

Polyfluorene derivatives arehHigh-performance organic hole-transporting materials for inorganic−organic hybrid perovskite solar cells

Language

English

Abstract

© 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. 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.

Publication Date

2014

Source Publication Title

Advanced Functional Materials

Volume

24

Issue

46

Start Page

7357

End Page

7365

Publisher

Wiley

DOI

10.1002/adfm.201401557

Link to Publisher's Edition

http://dx.doi.org/10.1002/adfm.201401557

ISSN (print)

1616301X

ISSN (electronic)

16163028

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