Department of Physics, Engineering Physics & Astronomy

Department of Physics, Engineering Physics & Astronomy
Department of Physics, Engineering Physics & Astronomy

Vapor Sensor and Resistless Pattern Generation based on Porous Silicon Formation

Jun Gao
Department of Physics, Queen's University

Wednesday, November 6, 2002
10:30 AM @ Stirling 501

Abstract:

Electrochemical dissolution of crystalline in hydrofluoric (HF) acid leads to the formation of a new class material, commonly known as porous silicon (PSi). The efficient and intriguing visible photoluminescence of PSi, discovered in 1990, has drawn great attention due to the possibility of silicon-based optoelectronics. PSi is also an interesting candidate for sensing applications due to its large specific area and tunable pore size, porosity, and chemical property. In this talk, I will first introduce a highly sensitive porous silicon-based optical vapor sensor. Despite its simple transducing mechanism, the sensor can detect alcohol vapor in ppb (part per billion) concentration range with a relatively large dynamic range. Then, I will show you a novel image and pattern generation technique based on the formation and then removal of a porous silicon layer.