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Photo-induced tunneling spectroscopy of ReS2: Dramatic increase of the quantum efficiency by chemical treatment

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Abstract

In this work we present a systematic study of the local photovoltaic properties of ReS2, using a scanning tunneling microscope (STM). The tunneling junction of the STM was optically illuminated during the tunneling process. The phase sensitive detected photo-induced tunneling current (PITC) was studied as a function of wavelength and surface topography. In order to improve the performance of ReS2 solar cells, the samples were treated with NaI/I2 and EDTA solutions. Relative to the untreated sample, the EDTA-treated samples show an increase in the photo-induced tunneling current by a factor of 8–10 in the whole spectral range, the NaI/I-treated samples by 2–3. Two dimensional mapping of the PITC was performed on an atomic scale and compared to the surface topography.

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  1. Fakultät für Physik, Universität Konstanz, D-78434, Konstanz, Germany

    S. Akari, K. Friemelt, K. Glöckler, M. Ch. Lux-Steiner, E. Bucher & K. Dransfeld

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  1. S. Akari
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  2. K. Friemelt
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  3. K. Glöckler
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  4. M. Ch. Lux-Steiner
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  5. E. Bucher
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  6. K. Dransfeld
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Akari, S., Friemelt, K., Glöckler, K. et al. Photo-induced tunneling spectroscopy of ReS2: Dramatic increase of the quantum efficiency by chemical treatment. Appl. Phys. A 57, 221–223 (1993). https://doi.org/10.1007/BF00332592

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  • DOI: https://doi.org/10.1007/BF00332592

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