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Photo-responsive Properties on Locally Confined Ultrathin Silicon Nanowires
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1  Ian Wark Research Institute, University of South Australia, Mawson Lakes Campus, Mawson Lakes, South Australia 5095, Australia
2  Peter Grünberg Institute, Forschungszentrum Juelich GmbH, Juelich, Germany

Abstract: We present a concept of hybrid photo-responsive device based on the combination of ultrathin SiNW with quantum dots (QDs). High quality SiNW arrays have been fabricated using a novel top-down process. The SiNW arrays were able to detect light from the UV up to the visible range with good sensitivity, fast response and ultrahigh photo responsivity (R~ 104 A/W) at room temperature. The SiNW arrays have good stabilities over long term measurement as well as a range of experimental conditions (e.g. temperature 273 – 343 K) and even after strong UV radiation exposure (up to 585  The SiNW arrays were coated with cadmium telluride (CdTe) QDs, and the hybrid QD sensitized devices displayed a significant improvement of the photocurrent measured under UV light while preserving their performance under visible light illumination. The sensitivity over a broad illumination range, the stability and high photoresponse of the new hydrid nanostructures is very promising towards the development of novel optoelectronic and photovoltaic devices.
Keywords: Ultrathin silicon nanowires; locally-thinned down; top-down fabrication; photo responsive; quantum dot.