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Issue 31, 2015
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Iodide-reduced graphene oxide with dopant-free spiro-OMeTAD for ambient stable and high-efficiency perovskite solar cells

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Abstract

Hygroscopic lithium-bis(trifluoromethane)sulfonimide (Li-TFSI) and corrosive pyridine doped 2,2′,7,7′-tetrakis(N,N-di-p-methoxy-phenylamine)-9,9′-spirobifluorene (spiro-OMeTAD) in perovskite solar cells generally results in poor device ambient stability due to moisture-induced degradation of the perovskite absorber. Simultaneously fulfilling good ambient stability and high efficiency, this work proposes the use of a p-type and highly conductive reduced graphene oxide (RGO) reduced by ferrous iodide acid solution, combined with dopant-free spiro-OMeTAD as a hole extraction and transport material in perovskite solar cells, achieving a maximum power conversion efficiency (PCE) of 10.6%, greatly outperforming the reference devices based on pure dopant-free spiro-OMeTAD (PCE = 6.5%). Impressively, only a 15% PCE degradation is observed for the device with RGO/dopant-free spiro-OMeTAD without encapsulation after 500 h, whereas the PCE drops by 65% for the device with Li-TFSI and pyridine doped spiro-OMeTAD. This work represents a significant step toward the realization of stable and high-efficiency perovskite solar cells.

Graphical abstract: Iodide-reduced graphene oxide with dopant-free spiro-OMeTAD for ambient stable and high-efficiency perovskite solar cells

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Supplementary files

Article information


Submitted
14 Apr 2015
Accepted
24 Jun 2015
First published
25 Jun 2015

J. Mater. Chem. A, 2015,3, 15996-16004
Article type
Paper
Author version available

Iodide-reduced graphene oxide with dopant-free spiro-OMeTAD for ambient stable and high-efficiency perovskite solar cells

Q. Luo, Y. Zhang, C. Liu, J. Li, N. Wang and H. Lin, J. Mater. Chem. A, 2015, 3, 15996
DOI: 10.1039/C5TA02710A

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