Electronics & Solar Photovoltaic
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High Purity Chemicals for the Electronics Industry
SoleChem's electronics portfolio covers high purity chemicals for semiconductor fabrication, solar photovoltaic manufacturing, lithium-ion battery production, and printed circuit board assembly. These workstreams demand electronic grade (commonly written EL grade) precursors — solvents, dopants, etchants, and metal salts produced to specifications a thousand times stricter than general industrial chemicals. At this purity tier, single contaminant atoms can change the performance of a finished microchip or cell.
View purity grades & sector applications
The industry classifies high-purity chemicals using the "N-notation" — the number after N counts the leading nines.
| Grade | Purity | Total impurity ceiling |
|---|---|---|
| 3N | 99.9 % | 0.1 % |
| 4N | 99.99 % | 0.01 % |
| 4N5 | 99.995 % | 0.005 % |
| 5N | 99.999 % | 0.001 % |
| 6N | 99.9999 % | 0.0001 % |
| 7N | 99.99999 % | 0.00001 % |
Each step reduces residual impurities tenfold. Beyond 6N, impurities are measured in parts per billion.
How EL-grade precursors are applied
Front-end wafer processing requires 5N–6N for semiconductor-grade solvents (IPA, NMP, PGMEA), photoresists, dopants, and CVD/ALD precursors. Even ppb-level iron contamination measurably shifts threshold voltage in the resulting microchip. Wet-etch acids (HF, H₂SO₄, HCl) follow SEMI standards (C12, C8, C1).
Solar photovoltaic manufacturing balances purity against cost — polysilicon at 6N–9N, dopants (POCl₃, BBr₃), anti-reflective coatings (SiH₄ for Si₃N₄ films), and module-grade EVA require consistently low ion content to avoid cell degradation under field UV exposure.
Battery electrolytes are purity-limited — LiPF₆ carries an HF spec below 50 ppm because residual acid corrodes the cathode and current collectors. NMC and LFP cathode metal sulfates (cobalt, nickel, manganese) are sourced at 3N5–4N5 with tight caps on sodium, calcium, copper, and chloride.
Downstream electronics assembly works at technical-to-electronic grade — plating baths (copper sulfate, gold cyanide), solder fluxes, ENIG chemistries, and conformal coatings. Trace organics and halides matter more here than ppb-level metals.
How SoleChem supports your supply chain
SoleChem sources EL-grade precursors at 4N–6N with lot-specific Certificates of Analysis (CoA), multi-supplier qualification, lot retention samples on request, and REACH-registered EU import. Request a quote with your CAS list and target purity grade — we respond within 24 business hours.
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