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Role of the Selective Contacts in the Performance of Lead Halide Perovskite Solar Cells

Juarez-Perez, Emilio J. and Wuβler, Michael and Fabregat-Santiago, Francisco and Lakus-Wollny, Kerstin and Mankel, Eric and Mayer, Thomas and Jaegermann, Wolfram and Mora-Sero, Ivan (2014):
Role of the Selective Contacts in the Performance of Lead Halide Perovskite Solar Cells.
In: The Journal of Physical Chemistry Letters, 5 (4), ACS Publications, pp. 680-685, ISSN 1948-7185,
[Online-Edition: http://dx.doi.org/10.1021/jz500059v],
[Article]

Abstract

The effect of electron- and hole-selective contacts in the final cell performance of hybrid lead halide perovskite, CH3NH3PbI3, solar cells has been systematically analyzed by impedance spectroscopy. Complete cells with compact TiO2 and spiro-OMeTAD as electron- and hole-selective contacts have been compared with incomplete cells without one or both selective contacts to highlight the specific role of each contact. It has been described how selective contacts contribute to enhance the cell FF and how the hole-selective contact is mainly responsible for the high Voc in this kind of device. We have determined that the recombination rate is mainly governed by the selective contacts. This fact has important implication for the future optimization of perovskite solar cells. Finally, we have developed a method to analyze the results obtained, and it has been applied for three different electron-selecting materials: TiO2, ZnO, and CdS.

Item Type: Article
Erschienen: 2014
Creators: Juarez-Perez, Emilio J. and Wuβler, Michael and Fabregat-Santiago, Francisco and Lakus-Wollny, Kerstin and Mankel, Eric and Mayer, Thomas and Jaegermann, Wolfram and Mora-Sero, Ivan
Title: Role of the Selective Contacts in the Performance of Lead Halide Perovskite Solar Cells
Language: English
Abstract:

The effect of electron- and hole-selective contacts in the final cell performance of hybrid lead halide perovskite, CH3NH3PbI3, solar cells has been systematically analyzed by impedance spectroscopy. Complete cells with compact TiO2 and spiro-OMeTAD as electron- and hole-selective contacts have been compared with incomplete cells without one or both selective contacts to highlight the specific role of each contact. It has been described how selective contacts contribute to enhance the cell FF and how the hole-selective contact is mainly responsible for the high Voc in this kind of device. We have determined that the recombination rate is mainly governed by the selective contacts. This fact has important implication for the future optimization of perovskite solar cells. Finally, we have developed a method to analyze the results obtained, and it has been applied for three different electron-selecting materials: TiO2, ZnO, and CdS.

Journal or Publication Title: The Journal of Physical Chemistry Letters
Volume: 5
Number: 4
Publisher: ACS Publications
Uncontrolled Keywords: CH3NH3PbI3, photovoltaics, perovskite, charge transfer, contact, TiO2, ZnO, CdS
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Surface Science
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 26 Feb 2015 10:28
Official URL: http://dx.doi.org/10.1021/jz500059v
Identification Number: doi:10.1021/jz500059v
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