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Issue 23, 2017
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Nanoscale imaging and spectroscopy of band gap and defects in polycrystalline photovoltaic devices

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Abstract

Improving the power conversion efficiency of photovoltaic (PV) devices is challenging because the generation, separation and collection of electron–hole pairs are strongly dependent on details of the nanoscale chemical composition and defects which are often poorly known. In this work, two novel scanning probe nano-spectroscopy techniques, direct-transmission near-field scanning optical microscopy (dt-NSOM) and photothermal induced resonance (PTIR), are implemented to probe the distribution of defects and the bandgap variation in thin lamellae extracted from polycrystalline CdTe PV devices. dt-NSOM provides high-contrast spatially-resolved maps of light transmitted through the sample at selected wavelengths. PTIR provides absorption maps and spectra over a broad spectral range, from visible to mid-infrared. Results show variation of the bandgap through the CdTe thickness and from grain to grain that is spatially uncorrelated with the distributions of shallow and deep defects.

Graphical abstract: Nanoscale imaging and spectroscopy of band gap and defects in polycrystalline photovoltaic devices

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Publication details

The article was received on 28 Feb 2017, accepted on 10 Apr 2017 and first published on 12 Apr 2017


Article type: Paper
DOI: 10.1039/C7NR01480E
Citation: Nanoscale, 2017,9, 7771-7780
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    Nanoscale imaging and spectroscopy of band gap and defects in polycrystalline photovoltaic devices

    Y. Yoon, J. Chae, A. M. Katzenmeyer, H. P. Yoon, J. Schumacher, S. An, A. Centrone and N. Zhitenev, Nanoscale, 2017, 9, 7771
    DOI: 10.1039/C7NR01480E

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