Enhanced Photodetection with Crystalline Si Nanoclusters
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
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
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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Document Type: Research Article
School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN 47907, USA
Department of Physics, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
School of Industrial Engineering, Purdue University, West Lafayette, IN 47907, USA
Gloriole Energy Management Inc., Infocity, Gandhinagar 382009, Gujrat, India
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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