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Enhanced Photodetection with Crystalline Si Nanoclusters

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SiO x nanodots were fabricated on a TiO2 thin film using glancing angle deposition technique. The fabricated samples were annealed at 950 °C in open air configuration to obtain Si nanoclusters resulting from phase separation of SiO x nanodots. Field Emission Gun Scanning electron microscopy and atomic force microscopy were used to examine the topography of the samples. The elemental composition of the samples was analyzed using energy dispersive X-ray mapping and their crystallinity was confirmed by analyzing the bandgap determined from the Tauc plots. The annealed samples show a broadband absorption which is about two folds in magnitude as compared to the as deposited (unannealed) samples. The photoluminescence spectra confirms the quantum confinement effect in the annealed samples. A photodetector was fabricated from an annealed sample by depositing gold contacts on top of it. This photodetector showed a two-fold increase in dark current and a 1.5-fold increase in light current compared to a photodetector made from the as-deposited SiO x samples—which is due to the increased crystallinity in Si nanoclusters. Finally, the rise and fall times of the device were measured through a switching experiment.
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Keywords: Photodetectors; Photoluminescence; Quantum Confinement; Silicon Nanocrystals

Document Type: Research Article

Affiliations: 1: School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN 47907, USA 2: Department of Physics, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India 3: School of Industrial Engineering, Purdue University, West Lafayette, IN 47907, USA 4: Gloriole Energy Management Inc., Infocity, Gandhinagar 382009, Gujrat, India 5: National Institute of Technology Agartala, Department of Electronics and Communication Engineering, Jirania 799046, Tripura, India

Publication date: April 1, 2020

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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