Mechanism of carrier accumulation in perovskite thin-absorber solar cells

Hui-Seon Kim, Ivan Mora-Sero (), Victoria Gonzalez-Pedro, Francisco Fabregat-Santiago, Emilio J. Juarez-Perez, Nam-Gyu Park () and Juan Bisquert
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Hui-Seon Kim: Sungkyunkwan University
Ivan Mora-Sero: Photovoltaic and Optoelectronic Devices Group, Departament de Física, Universitat Jaume I
Victoria Gonzalez-Pedro: Photovoltaic and Optoelectronic Devices Group, Departament de Física, Universitat Jaume I
Francisco Fabregat-Santiago: Photovoltaic and Optoelectronic Devices Group, Departament de Física, Universitat Jaume I
Emilio J. Juarez-Perez: Photovoltaic and Optoelectronic Devices Group, Departament de Física, Universitat Jaume I
Nam-Gyu Park: Sungkyunkwan University
Juan Bisquert: Photovoltaic and Optoelectronic Devices Group, Departament de Física, Universitat Jaume I

Nature Communications, 2013, vol. 4, issue 1, 1-7

Abstract: Abstract Photovoltaic conversion requires two successive steps: accumulation of a photogenerated charge and charge separation. Determination of how and where charge accumulation is attained and how this accumulation can be identified is mandatory for understanding the performance of a photovoltaic device and for its further optimization. Here we analyse the mechanism of carrier accumulation in lead halide perovskite, CH3NH3PbI3, thin-absorber solar cells by means of impedance spectroscopy. A fingerprint of the charge accumulation in high density of states of the perovskite absorber material has been observed at the capacitance of the samples. This is, as far as we know, the first observation of charge accumulation in light-absorbing material for nanostructured solar cells, indicating that it constitutes a new kind of photovoltaic device, differentiated from sensitized solar cells, which will require its own methods of study, characterization and optimization.

Date: 2013
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DOI: 10.1038/ncomms3242

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