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Issue 2, 2015
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Optical properties and limiting photocurrent of thin-film perovskite solar cells

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Abstract

Metal-halide perovskite light-absorbers have risen to the forefront of photovoltaics research offering the potential to combine low-cost fabrication with high power-conversion efficiency. Much of the development has been driven by empirical optimisation strategies to fully exploit the favourable electronic properties of the absorber layer. To build on this progress, a full understanding of the device operation requires a thorough optical analysis of the device stack, providing a platform for maximising the power conversion efficiency through a precise determination of parasitic losses caused by coherence and absorption in the non-photoactive layers. Here we use an optical model based on the transfer-matrix formalism for analysis of perovskite-based planar heterojunction solar cells using experimentally determined complex refractive index data. We compare the modelled properties to experimentally determined data, and obtain good agreement, revealing that the internal quantum efficiency in the solar cells approaches 100%. The modelled and experimental dependence of the photocurrent on incidence angle exhibits only a weak variation, with very low reflectivity losses at all angles, highlighting the potential for useful power generation over a full daylight cycle.

Graphical abstract: Optical properties and limiting photocurrent of thin-film perovskite solar cells

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Publication details

The article was received on 10 Oct 2014, accepted on 03 Dec 2014 and first published on 03 Dec 2014


Article type: Paper
DOI: 10.1039/C4EE03224A
Citation: Energy Environ. Sci., 2015,8, 602-609
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    Optical properties and limiting photocurrent of thin-film perovskite solar cells

    J. M. Ball, S. D. Stranks, M. T. Hörantner, S. Hüttner, W. Zhang, E. J. W. Crossland, I. Ramirez, M. Riede, M. B. Johnston, R. H. Friend and H. J. Snaith, Energy Environ. Sci., 2015, 8, 602
    DOI: 10.1039/C4EE03224A

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