Etching Definition and 32 Threads

I am learning about designing semiconductors but I had some issues understanding some things about the structure of Si. About lattice structure: 1) Why does an FCC has 8 atoms per cell? Doesnt has 14? About wafers 1) I know you can have wafers along different surfaces. What information can I...

Hi everybody. I'm an electronics hobbyist and use Ferric chloride to etch copper circuit boards. I'm left with a solution of copper chloride (or is it cupric chloride? Chemistry isn't my forte). So my question is, how do I dispose of it? I already searched around on the internet and there was no...

I am undertaking a personal project that requires me to etch some circuit boards. This needs to be done on the cheap and in this instance it is not feasible to send to a PCB company. I am a bit put off by the nasty chemicals and the need for correct disposal. I know you can use Vinegar and...

Does anyone know of an etching solution suitable for aluminium and its alloys that does not contain hydrofluoric acid?

Hello all, I am trying to etch SiO2 buried layer for MEMS suspended structures using RIE and the receipe is CHF3 + 2% O2 Plasma. In my structures, the sacrificial layer is SiO2. How does the etching process vary from vertical to lateral (underneath of top Si) etching of SiO2.

Im trying to etch 525um (100) p-type silicon, and i intend to use HF+HNO3+CH3COOH for high etching rate since i need to etch 525um of Si. does anyone know what ratio should i use to obtain high etching rate? I am trying to look for a mask that is able to withstand the attack of the etching...

I am thinking about using a metal mask for BOE or HF etching because I realize that for normal photoresist, it will gradually peel off and affect my results. I don't know which metal is the best--so far, I see people use Cr/Au, Al, and Ni. Anybody knows which metal will give the best result?

Hi all, I have had a problem in etching Borosilicate glass using BOE (6:1). As etching continues in the channel, the photoresist near the channel gradually peels off and when etching finishes (100nm), the lateral distance of peeled-off resist is big--about 6 microns. Anybody have a great...

Hi All! Haven't been here for some time, the changes are looking good! Anyway, formalities aside, I am having serious problems sourcing and implementing a suitable stainless steel (Grade: 304; thickness: 0.3mm) substrate for my etching process. I'm currently working on developing a...

Regarding the anisotropic etching of the (110) silicon wafer, why will the (110) oriented wafers form perpendicular trenches with the (111)?

Hi guys, Please give me some suggestions about etching TiO2 TiO2, MgF2, and Cr2O3 are sputtered on silicon substrate. The top pattern is TiO2 with the linewidth of 346nm. I would use E-beam to transfer pattern. The photoresist is PMMA. The possible etchant I have searched for is hydrogen...

Greetings all, I have some questions regarding to chemical reaction between Silicon,Si (wafer) and chemical dissolution. FYI, I'm doing electrochemical ething to fabricate porous Si. Could anyone help me to solve this chemical reactions? 1) Si (silicon wafer) + HF (hydroflouric acid)+...

Hi I have a small challenge. I need to etch aluminium oxide but not aluminum. Does anyone know if this is possible? If yes how? It is for some microelectronic devices. Hence I can afford etching the aluminum.

Hi guys, I've just started doing a bit of research in preparation for trying to print and make some DIY circuits. I was just wondering if there are techniques that are favored over others. Also I don't have a massive budget, so price is quite an important factor to me. From what I can find...

Please, give me some advices on how to etch SnO2 thin films. For wet etching, I tried HCl (5%), NH3Cl, and HF. They seem to not etch SnO2 or the time I put the SnO2 in the solution was too short (<5 mins). I used RIE with CHF3/Ar to etch SnO2. The RIE worked but the etching rate was so slow...

Hi there :) I have 10g of NaOH whit 1 liter of water for photo etching Solution is one year old, and do i need to make new one (is there a lifespan of solution) ? If yes how to dispose it safely ? (can it be disposed in regular drain ?) thanks for your time :)

Which Electrolyte can I use to etch Aluminum without generating toxic gases , I currently use 1200ml Water, 1200ml (30%-33% HCl) , 1200ml(68% HNO3) , 80ml(50% HF)

Many of you may be annoyed by my question. I'm sorry in advance. I've just finished my M.S. in Materials Science & Engineering, and have gotten an offer as a Semiconductor Process Engineer. The specialty is lithography and wet chemistry - including wet etching. As an MSE student I learned...

I understand that brass is an alloy of copper and zinc. If I want to eitch brass under standard condition, should I use iron III ions directly or use copper II first than us Fe III ion? I ask this because from the electric potential data, Fe metal will form under the presence of zinc if Fe...

What does it mean that an etch product (for example from sputtering or chemical etching) is volatile / non volatile?

Homework Statement In the semiconductor industry, integrated circuit (IC) production begins with the mechanical slicing of silicon rods into wafers. Once the wafers are sliced, the surfaces are lapped and polished to uniform flat surfaces. Contaminants and microscopic defects (work damage)...

Can anyone please help me with the selective etching of GaAs w.r.to Al0.3Ga0.7As.. I have tried out many compositions using the citric acid and hydrogen peroxide and none of them given in the literature work...Please help Ravi

I am made to understand that you are meant to use different etching agents for different aluminum alloys. How does one find which etching agent is the right one for each alloy? Does anyone know what etching agent I can use for Al 3104? Thank you

hi , i am newbie here and reading through i find it ... stimulating.. now as to what brought me here.. i have wanted to look into art form of acid etching different knids of tempered steel used in stainless knife blades.. does anyone there know what mask coating will take a fine line...

Hi I am trying to make a Si nanowire MOSFET and in this process I have to etch the toplayer of a SOI wafer. I have made some reactive ion etching (RIE) experiments on Si wafers and obtained an etch rate of 550 nm/min. SF6 have been used as the feedstock gas. However, when trying to...

Can anyone help me out - what is an effective acid to etch graphite? if any, what would be useful for etching graphite? thanks...

Hello All, I have a sample which has been covered in a layer of iron and gold for protection. So, in order to work with the sample, we need to etch away the metallic layers. I hear there is a specific chemical recipe for chemically etching away iron and gold from a sample. If anyone can link...

Greetings, Just a quick question. I would like to know what order of magnitude the etch rate will be for a solution with a pH of 14 on silica glass (flat surface at room temp) - are we talking nm/hr? microns/hr? mm/hr? Thanks, Claude.

Has anyone here micro etched material? I'm going to start learning the process of micro etching and have the oppertunity to do it to a bolt. I'm wondering what purposes it would serve... I know that from micro etching, you can see how a certain product has been formed from the lines, is this...

Hi! Is silicon inert? i.e. can I clean it from deposited films with e.g. HNO3 and H2SO4 without etching the silicon itself? What about amorphous carbon?

What is the best way to etch copper with house hold materials? It is for making print plates.

I'm looking for reliable (anisotropic) wet etch techniques that give high (~ 10^2) and low aspect ratios for GaAs on Al(0.3)Ga(0.7)As. I have a few in hand, but would be glad for any additional inputs, especially from someone with personal experience, or at least word-of-mouth knowledge. I'm...