Semiconductor-Grade Reagents: What They Are and When to Use Them

What is it?

“Semiconductor-grade” (often called Electronic Grade) refers to chemicals formulated and verified for microelectronics manufacturing, with ultra-low metallic ions, anions, particles, organics/TOC and extractables — typically controlled at ppb to ppt levels depending on the chemical and the process node. Industry specifications are set primarily through SEMI C-series chemical standards; individual documents define what to test and how purity is proven for each reagent

At modern nodes, traces of Na⁺/K⁺/Cu/Fe/B or sub-micron particles can seed defects, shift thresholds, poison catalysts, or create long-tail yield/reliability escapes. Standards and vendor controls exist to prevent device contamination during cleans, etches, litho, CMP, plating and drying.

Where did it come from & who defines it?

SEMI (Semiconductor Equipment and Materials International) publishes the C-series specifications and related methods for many wet chemicals used in fabs (e.g., SEMI C30 for H₂O₂; SEMI C41 for 2-propanol; SEMI C44 for H₂SO₄). Some specs also define extra-high-purity “tiers.” 

UPW (ultrapure water) quality that supports these chemistries is guided by SEMI F63, which standardizes resistivity, TOC, particles, etc. (context for rinse/cleanup around chemical steps).

Note on “levels”: Public/vendor literature commonly references G1–G5 levels for wet electronic chemicals (tighter metals/particles as line width shrinks), but always confirm the actual SEMI document for your specific chemical because limits vary by reagent and tier.

What’s “special” about semiconductor grade

Compared with “high-purity” lab grades, semiconductor grade is engineered against fab-critical contaminants and handling:

· Metals at ppt–ppb with defined target elements per chemical (e.g., P, S, alkali/alkaline earth, transition metals).

· Anions/cations (Cl⁻, SO₄²⁻, PO₄³⁻, F⁻, NH₄⁺, etc.) to very low μg/L levels depending on the spec.

· Particles (size distribution & counts) controlled and measured with liquid particle counters.

· TOC/UV absorbance/NVR per reagent standard; solvents may also specify water content (KF), UV background, and residue.

· Packaging in fluoropolymers (e.g., PFA) and distribution systems qualified to minimize leachables/extractables; SEMI C90 addresses low-extraction PFA used in chemical plumbing/components.

Typical Aladdin semiconductor/electronic-grade products

• Potassium hydroxide — P112281. semiconductor/electronic grade, ≥99.99% metals basis (sodium excluded): used in selective Si etch and cleaning workflows. 
• Ammonia solution — A112083 electronic grade (≥28% NH₃) for SC-1/APM blends. 
• Ammonium fluoride — A111760 electronic grade (40% soln.) for BOE. 
• Ammonium fluoride — A111762 (PrimorTrace™ electronic grade) solid, ≥99.99% metals basis.
• PGMEA — P299435/ PGME — M299436, IPA — I419710 electronic-grade (PrimorTrace™ lines) for litho clean/rinse.

Browse the Electronic Grade collection to filter many more items and see metals-basis specs.

You might also be interested in this topic. Check out Semiconductor materials and their properties.

Popular application areas

• Wafer cleaning (RCA/SC-1, SC-2), piranha (SPM), HF last, DI rinse & IPA dry. SC-1 (NH₄OH/H₂O₂/H₂O) removes organics/particles; SC-2 (HCl/H₂O₂/H₂O) targets metals. 
• Wet etch: HF, BOE, H₃PO₄, HNO₃, H₂SO₄ blends; metals etch/oxide strip.
• Lithography: developers (e.g., TMAH), strippers, high-purity solvents (PGMEA/PGME, IPA, acetone). 
• CMP/post-CMP clean, plating, packaging/assembly — all benefit from tightly specified contaminants (both dissolved metals and particles).

Comparison to adjacent grades (what’s not the same)

Grade	Primary focus	Why it’s not a substitute for semiconductor grade
HPLC / Gradient	Low UV absorbance, low NVR, stable baselines	May lack ppt metals spec & particle controls needed for wafer contact.
LC-MS / UHPLC-MS	Minimal TIC/background in MS; low adducting ions	Excellent for analytics, but “quiet TIC” ≠ controlled alkali/transition metals/particles for fabs.
ACS / AR	General analytical purity	Not designed around fab-critical ions/particles/packaging; metals often only “low ppb–ppm.”

Selection tips & cautions

· Start from the process spec: name the SEMI document/tier (e.g., “SEMI C30, Tier …”) and target elements you care about (Na, K, Ca, Mg, Fe, Cu, Ni, Zn, Al, B, P, S, etc.).

· Ask for particles (cut-size & counts, e.g., ≥0.1 µm) and TOC when relevant to your step.

· Packaging matters: prefer PFA bottles/liners & certified plumbing components to minimize leachables (see SEMI C90 context).

· Matrix matters: confirm the vendor can analyze/report at ppt in that matrix.

· CoA discipline: require lot-level CoA listing method, LoD, and uncertainty for the exact analytes you gate in incoming QC.

· Do not cross-grade: avoid substituting HPLC/LC-MS grades in fab steps without a metals/particles spec.

FAQs

Q1. Can I use HPLC-grade IPA to dry wafers?

Usually no. HPLC grade optimizes UV/TIC background, not ppt metals or particles that matter in wafer contact. Use electronic/semiconductor-grade IPA with metals/particles and water content specified.

Q2. Which tests best predict “fab-cleanliness”?

For most wet steps: ICP-MS (metals) + particles + IC (anions) + TOC. Add KF and UV/NVR for solvents.

Q3. Why the obsession with Na⁺/K⁺/B?

Alkalis and B (and transition metals like Fe/Cu/Ni) can dope or alter interfaces, shift device parameters, and cause reliability issues. Hence ppt targets.

Q4. Does packaging really change purity?

Yes — extractables from containers/plumbing can dominate at ppt levels; that’s why PFA and C90-qualified components are common.

Q5. What’s the link between UPW specs and chemicals?

Rinse steps bookend wet processing; UPW per SEMI F63 ensures rinsing doesn’t re-contaminate surfaces with TOC/ions/particles.

Q6. What’s in RCA cleans?

SC-1: NH₄OH/H₂O₂/H₂O for organics/particles; SC-2: HCl/H₂O₂/H₂O for metals — both demand electronic-grade reagents.

Why Aladdin for semiconductor-grade reagents

• Broad electronic-grade portfolio — from bases/acids to solvents and specialty precursors (e.g., PrimorTrace™ lines), surfaced together for easier selection. 
• Metals-basis specifications clearly indicated on product pages (e.g., KOH electronic/semiconductor grade ≥99.99% metals basis). Confirm lot-level CoAs per your gate. 
• Application fit — the portfolio maps to common fab chemistries for RCA cleans, etch/BOE, litho/develop/strip and solvent rinses.

 Aladdin: https://www.aladdinsci.com/