Study the Characteristic of Planer and Sandwich PSi Gas Sensor (Comparative Study)

Abstract

In this work, two configurations (planner and sandwich) structures of (Al/n PSi/n-Si/Al) porous silicon (PSi) gas sensor have been fabricated and tested extensively for CO 2 gas molecules. Two laser wavelength infrared and violet of (810 nm) and (405 nm) was used in the laser assisting etching process on the n-type silicon substrate. The gas detection characteristic of planner and sandwich configuration were studied under different condition. The resistance measurement, for the planner and J-V characteristic for sandwich structures, which was analyzed based on the nano-sized silicon, porosity, layer thickness, and the effective dielectric constant of the PSi layer. The SEM image of the PSi layer showed the formation pore-like structure with cylindrical and rectangular pore shape with different dimensions for infrared illuminated PSi and crossed pores-like structure with randomly distributed for violet illuminated PSi. The sensing mechanism for sandwich structure configuration is governed by the porous silicon parameters, while for planer configuration the silicon channel among the pore has a significant role in sensing process.

The Effects of Psi Morphology on the Detection Efficiency of the Au-Nps Hot Spot SERS Sensors

“…This type of PSi morphology is characterized by high density of Si hydrogenated bonds (Si-H x ) with x=2, 3. [19,20]. This structure is related to the doping of the Si wafer.…”

Detection of Reproductive Hormones in Females by Using 1D Photonic Crystal-Based Simple Reconfigurable Biosensing Design

“…First time the pioneering work of PBGs was predicted by two scientists, Yablonovitch and John, in 1987; since then, the contribution of PhCs has revolutionized the field of optical engineering and technology [10,11]. Presently, PhC-based photonic devices, such as optical switches, reconfigurable biosensors, multimode biosensors, photovoltaic cells, solar cells and loss-free optical waveguides, are being used in engineering and technological applications [12][13][14], which makes PhCs one of the hot research fields for photonics, electromagnetic, biological and biomedical engineering [15][16][17][18]. The introduction of the defect layer between PhC results in the localization of photons by means of a single transmission peak called the resonant mode inside PBG, because of a break in the periodicity of the structures [19][20][21][22][23][24][25].…”

Remote Temperature Sensor Based on Tamm Resonance

“…He presented the first explanation about the photonic crystal. Then, this field attracted visual attention in different applications such as chemical sensors [5,6], biosensors [7][8][9], filters [10,11], optical lenses [12], solar cells [13], and other applications [14][15][16][17][18][19][20][21]. Recently, the main challenge is how to use Nanomaterials with a very small size to create smart structures that can be used as complex and sophisticated devices [22][23][24].…”