Porous Silicon Wafers for Research & Production 

Porous Silicon for RF Thin Film Devices

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Reference #320311 for specs and pricing.

Porous Silicon Wafer

The following wafer spec has been used in experiments. 100mm silicon wafer N/Ph (100) 150µm 1–2 Ω cm SSP.

The novel uses of porous silicon include powering sattelites and perhaps even space ships!

In the early 2000s scientists discoverd that hydrogenated porous silicon reacts explosively with oxygen at very low (cryogenic) temperatures. A porous silicon wafer in say outer space would release several times as much energy as an equivalent amount of dynamite, and at a much greater speed. The properties of the porous silicon and how it handles oxygen very well. This allows for a fats and even detonation.

Currently porous silicon is being researched as a potential thrusting mechanism for satellites.

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Porous Silicon Discovery

In 1956 porous silicon was first discovered. The material gained importance in the 1990s when two optical properties were discovered. In the study of transmembrane proteins, a porous silicon membrane of 3 micrometers diameter was produced, which produced a high-resolution image of the surface of a single protein.

Electrochemical Impedance Spectroscopy (EIS) investigated the protein and the experiment was published in the Journal of The American Chemical Society (ACS) journal ACS Nano in June 2014.

The experimental process required the development of a porous silicon membrane, followed by the synthesis of an epithelial sodium channel protein (ENaC) in Langmuir - Blodgett - Lang Muir and Schafer technique. Finally, the epithelium - sodium - channel - protein EN aC was fused to form a lipid two-layer membrane.

The functioning of the device was investigated by means of electrochemical impedance spectroscopy (EIS) and magnetic resonance imaging (MRA).

Wafers Used for Electrochemical Etching to Obtain Porous Silicon Particles

A scientist asked us which silicon wafer spec is used to obtain porous silicon particles.

We quoted the following:

Si Item #1116
100mm P/B (100) 10-20 ohm-cm SSP Prime Grade and we deposited an Al Layer on Backside in order to have an ohmic contact

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How to Make Rugate Optical Filters Using Porous Silicon

Etching Silicon Wafers to make colorful Rugate Optical Filters

Important Porous Silicon Terms

The following are some porous silicon keywords.

• porous silicon
• metallic nanostructures
• electrochemical etching
• anodic silicon
• silicon wafers
• silicon layers
• silicon nanocrystallites
• silicon surfaces
• silicon structures
• silicon substrate
• silicon fabrication
• silicon atoms
• electrochemical anodization
• crystalline silicon
• silicon formation
• optical biosensor

How to Fabricate Porous Silicon

Fabrication method

The fabrication method of porous silicon focuses on the layering of p-Si or AgNPs. Using a vacuum holding and pulling technique, large silicon wafers are etched in an electrochemical cell. A porous silicon layer is then ''deposited'' on the as-prepared solar cell, which improves the efficiency of the cell. The process has the potential to be used in energy storage and photovoltaic devices.

The fabrication method of porous Si is relatively simple. Electrochemical etching of porous silicon produces porous silicon with a varying pore size. Pore size can be controlled by changing the current density. Larger pore sizes are preferable for large molecules or drugs. The larger the pore size, the faster the host matrix degrades. The fabrication protocol of porous silicon is detailed in the publications.

A second porous silicon fabrication method involves a layer transfer technique. This method requires the use of anodizing a silicon substrate in order to enable the formation of thick silicon layers. The first porous layer is fabricated with a low porosity, and the second layer is formed with a high-porosity layer. The device layer is then fused to the handle substrate using high-temperature argon annealing.

During the formation of porous silicon, hydrogen will be evolved. The introduction of absolute ethanol to the solution will eliminate hydrogen. The introduction of ethanol will improve the infiltration of HF solution into pores and will result in a more uniform distribution of thickness and porosity. Lastly, alcohol adsorption enhances the diffusion process and enables the formation of the porous silicon layer. So, if you are looking for a porous silicon fabrication method, read on!

The pore geometry depends on the crystalline orientation. For instance, a hundred-cut Si crystal has perpendicular pores. On the other hand, Si (001) has perpendicular pores. Therefore, the pore geometry of 100-cut silicon depends on its orientation. The pore geometry and architecture of a porous layer are crucial for the pore formation. The fabrication method for porous silicon is still a relatively young process but it is one that is gaining a lot of attention in the last decade.

Video: How to Make Porous Silicon?