Wet Etching Recipes
References
Etch rates for Micromachining Processing (IEEE Jnl. MEMS, 1996) - includes tables of etch rates of numerous metals vs. various wet and dry etchants.
Etch rates for micromachining-Part II (IEEE Jnl. MEMS, 2003) - expanded tables containing resists, dielectrics, metals and semiconductors vs. many wet etch chemicals.
Guide to references on III±V semiconductor chemical etching - exhaustive list of wet etchants for etching various semiconductors, including selective etches.
Compound Semiconductor Etching
Guide to references on III±V semiconductor chemical etching
Please add any confirmed etches from this reference to the The Master Table of Wet Etching (Include All Materials).
Metal Etching
- Selective Wet Etch of Cr over Ta using Cr Etchant
- Wet Etch of ITO using Heated, Diluted HCl Solution
Silicon etching
Etch rates for micromachining processing
Etch rates for micromachining processing-part II
Please add any confirmed etches from this reference to the The Master Table of Wet Etching (Include All Materials).
Dielectric etching
Organic removal
Gold Plating
Chemi-Mechanical Polishing (CMP)
Example Wet Etching Table
How to use the Master Table of Wet Etching:
When entering a new etch into the table make a row for every etchant used in the solution such that the information can be sorted by etchant. For example, the InP etch HCl:H3PO4(1:3) and H3PO4:HCl(3:1). Likewise, if etch is known to be selective to multiple materials the etch should have a row for each material. For example HCl:H3PO4(1:3) is selective to both InGaAs and InGaAsP.
This multiple entry method may seem laborious for the person entering a new etch, however the power of sorting by selective materials and chemicals in a table with all materials is great.
| Material | Etchant | Rate (nm/min) | Anisotropy | Selective to | Selectivity | Ref. | Notes | Confirmed by | Extra column |
|---|---|---|---|---|---|---|---|---|---|
| InP | HCl:H3PO4(1:3) | ~1000 | Highly | InGaAs | High | Lamponi (p.102) | Example | Jon Doe | Example |
| InP | HCl:H3PO4(1:3) | ~1000 | Highly | InGaAsP | High | Lamponi (p.102) | Example | Jon Doe | Example |
| InP | H3PO4:HCl(3:1) | ~1000 | Highly | InGaAs | High | Lamponi (p.102) | Example | Jon Doe | Example |
| InP | H3PO4:HCl(3:1) | ~1000 | Highly | InGaAsP | High | Lamponi (p.102) | Example | Jon Doe | Example |
The Master Table of Wet Etching (Include All Materials)
| Material | Etchant | Rate (nm/min) | Anisotropy | Selective to | Selectivity | Ref. | Notes | Confirmed by | Extra column |
|---|---|---|---|---|---|---|---|---|---|
| InP | HCl:H3PO4(1:3) | ~1000 | Highly | InGaAs | High | Lamponi (p.102) | Example | Jon Doe | Example |
| InP | HCl:H3PO4(1:3) | ~1000 | Highly | InGaAsP | High | Lamponi (p.102) | Example | Jon Doe | Example |
| InP | H3PO4:HCl(3:1) | ~1000 | Highly | InGaAs | High | Lamponi (p.102) | Example | Jon Doe | Example |
| InP | H3PO4:HCl(3:1) | ~1000 | Highly | InGaAsP | High | Lamponi (p.102) | Example | Jon Doe | Example |
| Al2O3 (ALD Plasma 300C) | 300MIF | ~1.6 | High | Measured in-house | Rate slows with time, Selective to most non-Al Materials | JTB | Example | ||
| Al2O3 (ALD Plasma 300C) | 400K | ~2.2 | High | Measured in-house | Rate slows with time, Selective to most non-Al Materials | JTB | Example | ||
| Al2O3 (ALD Plasma 300C) | 400K(1:4) | ~1.6 | High | Measured in-house | Rate slows with time, Selective to most non-Al Materials | JTB | Example | ||
| Al2O3 (ALD Plasma 300C) | NH4OH:H2O2:H2O (1:2:50) | ~<0.5 | High | Measured in-house | Rate slows with time | JTB | Example | ||
| Al2O3 (IBD) | Buffered HF 49% | 167 | Photoresist | High | Measured in-house | Biljana Stamenic | 2017-12 | ||
| Al2O3 (IBD) | 726 MiF Developer | 3.5 | Measured in-house | Demis D. John | 2017-11 | ||||
| Al2O3 (AJA#4) | 300 MiF | 4.30 | Measured in-house | Demis D. John | 2018-02 | ||||
| SiO2 (PECVD #1) | Buffered HF 49% | ~100 | Photoresist | High | Measured in-house | Biljana Stamenic | 2017 | ||
| SiO2 (PECVD #2) | Buffered HF 49% | ~500 | Photoresist | High | Measured in-house | Biljana Stamenic | 2017 |