SemiconductorX > Materials & IP > Process Inputs > Process Chemicals Reference
Semiconductor Process Chemicals
This page is a process-step-organized reference for the chemicals consumed across front-end and back-end semiconductor fabrication. It covers cleaning, lithography, deposition, etch, CMP, doping, and BEOL/packaging steps. For supply chain analysis, geographic concentration, and strategic risk discussion, see Critical Chemicals. For process gases, see Process Gases.
1. Wafer Cleaning
| Chemical | Function | Representative Suppliers | Risk |
|---|---|---|---|
| HF (Hydrofluoric Acid) | Native oxide removal; buffered HF (BHF) for selective oxide etch; dilute HF (DHF) for surface prep | Stella Chemifa (JP), Honeywell (US), Solvay (BE), Mexichem/Orbia (MX) | High |
| H2SO4 (Sulfuric Acid) | Piranha clean (H2SO4 + H2O2) for organic contamination and photoresist removal | BASF (DE), Entegris/KMG (US), Kanto Chemical (JP) | Low |
| H2O2 (Hydrogen Peroxide) | Oxidizing agent in piranha (H2SO4/H2O2) and SC-1 (NH4OH/H2O2/DI) clean sequences | Evonik (DE), Solvay (BE), Mitsubishi Gas Chemical (JP) | Low |
| NH4OH (Ammonium Hydroxide) | SC-1 clean (with H2O2 and DI water) for particle and organic removal | BASF (DE), Kanto Chemical (JP), Stella Chemifa (JP) | Low |
| HCl (Hydrochloric Acid) | SC-2 clean (with H2O2 and DI water) for metallic ion removal | BASF (DE), Stella Chemifa (JP), Tokuyama (JP) | Low |
| IPA (Isopropyl Alcohol) | Post-clean wafer drying (Marangoni drying); surface residue removal | Entegris/KMG (US), BASF (DE), Tokuyama (JP) | Low |
| TMAH (Tetramethylammonium Hydroxide) | Photoresist developer (positive tone); anisotropic silicon etch for MEMS | SACHEM (US), Chang Chun Group (TW), Stella Chemifa (JP) | Moderate |
| Ozone (O3) -- dissolved or gaseous | Organic removal and surface oxidation as PFAS-free alternative to some acid cleans; growing use in advanced node pre-gate cleaning | Generated on-site by ozone generators (MKS Instruments, Primozone) | Low |
2. Lithography
| Chemical | Function | Representative Suppliers | Risk |
|---|---|---|---|
| ArF Photoresist (CAR) | Chemically amplified resist for 193nm immersion DUV lithography; positive and negative tone formulations for logic and memory patterning | JSR (JP), TOK/Tokyo Ohka (JP), Shin-Etsu Chemical (JP), Sumitomo Chemical (JP), Fujifilm (JP) | Critical |
| EUV Photoresist (CAR) | Chemically amplified resist formulated for 13.5nm EUV exposure; adapted polymer chemistry for EUV photon absorption | JSR (JP), Shin-Etsu Chemical (JP), TOK (JP), Fujifilm (JP) | Critical |
| Metal Oxide Resist (MOR) | Inorganic tin-oxide-based resist for EUV and High-NA EUV; superior resolution and etch selectivity vs CAR; enables single-patterning at sub-5nm | Inpria/JSR (US/JP), Fujifilm (JP) | Critical |
| KrF Photoresist | 248nm DUV resist for mature nodes (90nm-250nm); still in use for NAND flash layers and mature foundry | JSR (JP), TOK (JP), Shin-Etsu (JP), Dongjin Semichem (KR) | Moderate |
| HMDS (Hexamethyldisilazane) | Adhesion promoter applied to wafer surface before resist coating; converts surface hydroxyl groups to improve resist adhesion | Shin-Etsu Chemical (JP), Dow (US), Merck KGaA (DE) | Low |
| PGMEA (Propylene Glycol Monomethyl Ether Acetate) | Primary solvent for photoresist formulation and spin coating; high boiling point enables controlled evaporation during spin | Dow (US), BASF (DE), Kuraray (JP) | Low |
| Photoresist Developer (TMAH 2.38%) | Standard aqueous developer for positive-tone photoresist; 2.38% TMAH is the industry-standard concentration | SACHEM (US), Chang Chun Group (TW), Tokyo Ohka (JP) | Moderate |
| Anti-Reflective Coating (ARC) -- BARC/TARC | Bottom and top anti-reflective coatings to suppress standing wave effects in resist; critical for CD uniformity at advanced nodes | Brewer Science (US), JSR (JP), Shin-Etsu (JP) | Moderate |
3. Deposition (CVD / ALD / PVD)
| Chemical | Function | Representative Suppliers | Risk |
|---|---|---|---|
| TCS (Trichlorosilane, SiHCl3) | Silicon epitaxy precursor; also polysilicon CVD; Siemens process intermediate for polysilicon production | Wacker Chemie (DE), Tokuyama (JP), Shin-Etsu (JP) | Moderate |
| TEOS (Tetraethyl Orthosilicate, Si(OC2H5)4) | Silicon dioxide CVD precursor (PECVD and LPCVD); produces conformal oxide films for ILD and gap fill | Evonik (DE), Merck KGaA (DE), Entegris (US) | Low |
| TMA (Trimethylaluminum, Al(CH3)3) | ALD precursor for Al2O3 high-k dielectric and aluminum metal layers; also used in III-V epitaxy | Nouryon (NL), Entegris (US), UP Chemical (KR) | Moderate |
| TDMAT / TDMAH (Hafnium Precursors) | ALD precursors for HfO2 high-k gate dielectric; critical for sub-28nm transistor gate stacks (HKMG) | Entegris (US), Merck KGaA (DE), Air Liquide (FR) | Moderate |
| WF6 (Tungsten Hexafluoride) | CVD precursor for tungsten contact plug fill and barrier metal deposition; dominant tungsten deposition source | Linde (IE), Air Products (US), Stella Chemifa (JP) | High |
| GeH4 (Germane) | SiGe epitaxial CVD precursor for strained channel layers in FinFET and GAA transistors | Linde (IE), Air Products (US), Taiyo Nippon Sanso (JP) | Critical |
| TMGa (Trimethylgallium) | MOCVD precursor for GaAs, GaN, and InGaAs epitaxial layers; RF and power device substrates | Nouryon (NL), Entegris (US), UP Chemical (KR) | High |
| TMIn (Trimethylindium) | MOCVD precursor for InP, InGaAs, and InAlAs heterostructures; high-speed and photonic devices | Nouryon (NL), Entegris (US), Tanaka Kikinzoku (JP) | High |
| DEZn (Diethylzinc) | MOCVD precursor for ZnO and II-VI compound semiconductor layers; also n-type dopant in GaAs MOCVD | Nouryon (NL), Entegris (US) | Moderate |
| DMDNPH / Zirconium Precursors (ALD) | ALD precursors for ZrO2 high-k dielectric; alternative to HfO2 for specific device architectures | Merck KGaA (DE), Entegris (US), Air Liquide (FR) | Low |
| TPOT / Titanium Precursors (ALD/CVD) | TiN barrier and liner deposition via ALD/CVD; TiN used as gate metal and diffusion barrier in CMOS | Entegris (US), Merck KGaA (DE), Gelest (US) | Low |
| Ruthenium Precursors (ALD) | Ru metal ALD for advanced BEOL barrier/liner at sub-5nm; replacing TaN/Ta in some copper interconnect schemes | Merck KGaA (DE), Entegris (US), Tanaka Kikinzoku (JP) | Moderate |
| Cobalt Precursors (ALD/CVD) | Cobalt metal fill for contact plug and liner in advanced logic; Intel deployed Co contacts at 10nm | Entegris (US), Merck KGaA (DE), Air Liquide (FR) | Moderate |
4. Etch
| Chemical | Function | Representative Suppliers | Risk |
|---|---|---|---|
| HF (Wet Etch) | Silicon oxide wet etch; sacrificial oxide removal in MEMS release; DHF and BHF formulations for controlled etch rate | Stella Chemifa (JP), Honeywell (US), Solvay (BE) | High |
| H3PO4 (Phosphoric Acid) | Hot phosphoric acid etch for silicon nitride (Si3N4) selective to oxide; widely used in STI and spacer patterning | BASF (DE), Kanto Chemical (JP), Stella Chemifa (JP) | Low |
| KOH (Potassium Hydroxide) | Anisotropic crystallographic silicon etch for MEMS structures; etches (100) faster than (111) planes | BASF (DE), Kanto Chemical (JP) | Low |
| HNO3 (Nitric Acid) | Silicon oxidation in wet etch blends; metal surface passivation; mixed with HF for silicon etch (HNA blend) | BASF (DE), Kanto Chemical (JP), Stella Chemifa (JP) | Low |
| NMP (N-Methyl-2-pyrrolidone) | Photoresist strip solvent; polymer and organic film removal in BEOL rework; also used in battery electrode slurry | BASF (DE), Mitsubishi Chemical (JP), LyondellBasell (NL) | Moderate |
| Acetone / EKC Strippers | Photoresist strip solvents; EKC (DuPont) specialty strippers for post-etch and post-ash residue removal | DuPont/EKC (US), Entegris (US), Avantor (US) | Low |
5. CMP (Chemical Mechanical Planarization)
| Chemical | Function | Representative Suppliers | Risk |
|---|---|---|---|
| Silica CMP Slurry | Colloidal silica abrasive for silicon and oxide polishing; wafer final polish (prime) and inter-layer dielectric planarization | Fujimi (JP), Entegris/CMC (US), DuPont (US) | Moderate |
| Ceria CMP Slurry | Cerium oxide abrasive for STI (shallow trench isolation) and ILD oxide planarization; higher removal rate and selectivity than silica for oxide-to-nitride applications | AGC/Seimi Chemical (JP), Entegris/CMC (US), Fujimi (JP) | High |
| Copper CMP Slurry | Copper damascene planarization; oxidizer-based chemistry (H2O2 or ferric nitrate) with silica or alumina abrasive | Entegris/CMC (US), DuPont (US), Resonac/Hitachi Chemical (JP) | Moderate |
| Tungsten CMP Slurry | Tungsten plug and contact planarization; selectivity to oxide stop layer is critical metric | Entegris/CMC (US), DuPont (US), Fujimi (JP) | Moderate |
| SiC CMP Slurry | SiC substrate and epiwafer polishing to epi-ready surface; diamond abrasive or engineered silica; extremely slow material removal rate due to SiC hardness | Entegris (US), Fujimi (JP), Saint-Gobain (FR) | Moderate |
| Post-CMP Cleaning Chemistry | Removal of slurry residue and abrasive particles after CMP; citric acid, H2O2, and proprietary surfactant blends | Entegris (US), Anji Microelectronics (CN), Cabot (US) | Low |
6. Doping & Ion Implant
| Chemical | Function | Representative Suppliers | Risk |
|---|---|---|---|
| Phosphine (PH3) | n-type dopant source for ion implant and diffusion doping; also CVD dopant for in-situ doped epitaxy | Linde (IE), Air Products (US), Taiyo Nippon Sanso (JP) | Moderate |
| Arsine (AsH3) | n-type dopant for high-concentration implant; also MOCVD arsenic source for GaAs and InGaAs epitaxy | Linde (IE), Air Products (US), Taiyo Nippon Sanso (JP) | High |
| Diborane (B2H6) | p-type boron dopant for CVD in-situ doping and diffusion; also used in BPSG (borophosphosilicate glass) deposition | Linde (IE), Air Products (US), Kanto Denka (JP) | Moderate |
| BF3 (Boron Trifluoride) | Ion implant dopant source for shallow p-type junctions; preferred over B2H6 for certain implant energy ranges | Linde (IE), Air Products (US), Stella Chemifa (JP) | Moderate |
| Solid Dopant Sources (As2O3, B2O3, P2O5) | Solid-source diffusion doping for mature node and power device fabs; slower transition than ion implant but lower capital cost | Honeywell (US), Praxair/Linde (US/IE) | Low |
7. BEOL Metallization & Packaging
| Chemical | Function | Representative Suppliers | Risk |
|---|---|---|---|
| Copper Electroplating Bath (CuSO4 + additives) | Damascene copper via and line fill; additive chemistry (accelerators, suppressors, levelers) controls fill profile and defect density | MacDermid Enthone (US), Atotech (DE), DuPont (US) | Moderate |
| TaN/Ta CVD/PVD Precursors | Tantalum nitride barrier layer for copper damascene; prevents copper diffusion into dielectric | Entegris (US), Merck KGaA (DE), Air Liquide (FR) | Moderate |
| Low-k Dielectric Precursors (SiCOH, porous SiO2) | CVD/spin-on deposition of low dielectric constant interlayer dielectric to reduce RC delay in advanced BEOL | Dow (US), Merck KGaA (DE), Applied Materials (US, process) | Moderate |
| Underfill (Capillary Epoxy) | Epoxy fill between flip-chip die and substrate; manages CTE mismatch stress and improves solder joint reliability | Namics (JP), Henkel (DE), Shin-Etsu Chemical (JP) | Moderate |
| Epoxy Mold Compound (EMC) | Transfer or compression molding compound for die encapsulation in wire-bond and flip-chip packages; silica filler + epoxy resin | Sumitomo Bakelite (JP), Showa Denko (JP), Henkel (DE) | Moderate |
| Solder Paste / Flux (SAC alloys) | Tin-silver-copper (SAC) solder for BGA, flip-chip, and package-to-board interconnect; flux chemistry controls oxide removal and wetting | Senju Metal (JP), Henkel (DE), MacDermid Alpha (US) | Low |
| Polyimide (Passivation / RDL) | Spin-on passivation layer; redistribution layer (RDL) dielectric in wafer-level packaging and fan-out structures | HD Microsystems/Hitachi Chemical (JP), Toray (JP), Dow (US) | Low |
| Die Attach Film / Paste (DAF) | Adhesive for die-to-substrate and die-to-die attachment in stacked packages (HBM, 3D NAND); film format for wafer-level application | Henkel (DE), Shin-Etsu Chemical (JP), Toray (JP) | Low |
Supply Chain Risk Flag
Critical -- extreme geographic concentration, export control exposure, or no practical substitute; supply disruption would halt production.
High -- significant concentration or handling barriers; limited qualified supplier base.
Moderate -- some concentration or regulatory pressure; substitution possible but requires requalification.
Low -- broadly produced; multiple qualified sources; no near-term strategic exposure.
Related Coverage
Process Inputs Overview | Materials & IP Hub | Critical Chemicals | Process Gases | Photomasks | Photoresist | CMP Slurries | Critical Elements & Geopolitics | Photolithography | CMP Process | Bottleneck Atlas