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ChemSusChem. 2017 Aug 10;10(15):3098-3104. doi: 10.1002/cssc.201700872. Epub 2017 Jul 19.

Benzoyl Peroxide as an Efficient Dopant for Spiro-OMeTAD in Perovskite Solar Cells.

Author information

1
Department of Materials science and Engineering, College of Materials, Xiamen University, Xiamen, 361005, P. R. China.
2
Weihua Solar Co. Ltd., Xiamen, 361115, P. R. China.
3
Materials Genome Institute, Shanghai University, Shanghai, 200444, P. R.China.

Abstract

Although organic small molecule spiro-OMeTAD is widely used as a hole-transport material in perovskite solar cells, its limited electric conductivity poses a bottleneck in the efficiency improvement of perovskite solar cells. Here, a low-cost and easy-fabrication technique is developed to enhance the conductivity and hole-extraction ability of spiro-OMeTAD by doping it with commercially available benzoyl peroxide (BPO). The experimental results show that the conductivity increases several orders of magnitude, from 6.2×10-6  S cm-1 for the pristine spiro-OMeTAD to 1.1×10-3  S cm-1 at 5 % BPO doping and to 2.4×10-2  S cm-1 at 15 % BPO doping, which considerably outperform the conductivity of 4.62×10-4  S cm-1 for the currently used oxygen-doped spiro-OMeTAD. The fluorescence spectra suggest that the BPO-doped spiro-OMeTAD-OMeTAD layer is able to efficiently extract holes from CH3 NH3 PbI3 and thus greatly enhances the charge transfer. The BPO-doped spiro-OMeTAD is used in the fabrication of perovskite solar cells, which exhibit enhancement in the power conversion efficiency.

KEYWORDS:

benzoyl peroxide; hole-transport layer; perovskite solar cells; power conversion efficiency; spiro-ometad

PMID:
28661581
DOI:
10.1002/cssc.201700872
[Indexed for MEDLINE]

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