DEEP RESEARCH · OCI Holdings

OCI Holdings: From commodity chemicals to advanced energy materials

PERC → TOPCon → perovskite tandem: what grows, what is new, and what fades

Date: 2026-02-08 · Solar BOM, value chain and geopolitics · Naver blog source

0. Bottom line first

1. The technology inflection

PERC is saturating near its theoretical efficiency limit of 24%. The industry is accelerating into N-type TOPCon/HJT, and ultimately perovskite-silicon tandem with silicon as the bottom cell. The added stack — perovskite, ETL, HTL, TCO on top — drives demand for higher-functionality materials. ETIP PV SRIA Update

2. Polysilicon — quality, not just quantity

2.1 P-type → N-type

PERC used boron-doped P-type with LID and tolerance limits. TOPCon/HJT use phosphorus-doped N-type — high electron mobility but extreme purity sensitivity, requiring electronic-grade ≥11N polysilicon. Solar-grade P-type tolerates 10–50 ppbw of metal impurities; N-type needs ≤1–5 ppbw. Market data: in 2024–25 N-type polysilicon commands an ~USD 1.5–3.0/kg premium over P-type. OCI’s Malaysia base captures both a non-China premium and N-type premium. Coherent Market Insights, SMM, OPIS Solar Weekly

2.2 Material intensity (g/W)

• PERC (P-type): ~2.4–2.6 g/W
• TOPCon (N-type): ~2.0–2.2 g/W
• Perovskite/Si tandem: ~1.6–1.8 g/W

Interpretation: Higher efficiency (22% → 33%) plus wafer thinning (170 → 100–130μm) cuts polysilicon per GW from ~2,400 to ~1,600 tonnes (~33% less). Global demand is shifting to TW scale, however, so OCI’s volumes don’t fall — the mix moves from ‘low-purity high-volume’ to ‘high-purity high-value.’

2.3 CubicPV partnership and ‘direct wafer’

OCI Holdings signed a USD 1B long-term supply contract with US CubicPV. CubicPV’s ‘direct wafer’ technology skips ingot growth and sawing — drastically reducing kerf loss (~30–40% in standard sawing). If this becomes a tandem-scale standard, OCI becomes a tech partner — not just a raw-material supplier. KED Global, Business Wire.

3. New and growing materials — OCI’s opportunity

3.1 Perovskite precursors — the ‘new light-absorbing heart’

• PbI₂ / PbBr₂: central to crystal formation. Today small-volume suppliers like TCI and Greatcell exist, but at GW scale, ton-scale industrial supply will be needed — OCI’s lane.
• Organic cations (FAI, MABr): determine thermal stability; ≥5N purity required. Explosive growth ahead. TMR — FAI
• Functional solvents: DMF/DMSO today, but toxicity drives demand for greener alternatives — an OCI R&D opportunity. TCI — Solar Cell Materials, RSC — bottom cell design, ACS — Titanium silicide recombination layer

3.2 Transparent conductive oxides (TCO) — indium surge

• Tandem requires the top cell to let light through to the bottom cell — metal grids replaced by TCOs.
• Main material: ITO. Indium demand spikes.
• PERC: <1 mg/W indium. HJT / tandem: ~15–20 mg/W (tens of times more). Price risk + accelerates AZO substitution research.

3.3 Specialty gases — silane (SiH₄) returns

Essential for TOPCon poly-Si layers and HJT/tandem a-Si thin films. OCI is expanding its silane gas facility in Gunsan — triple-demand from semiconductors, EV silicon anodes and solar. Inox Air Products, OCI Integrated Report 2024

3.4 Encapsulants — EVA → POE

• EVA hydrolyzes and releases acetic acid — corrodes moisture-sensitive perovskite. Not fit-for-purpose.
• POE (polyolefin elastomer) has low water permeability and no acid — fast becoming the standard for N-type and tandem modules.
• POE/EPE share went from ~30% in 2023 to projected >50% by 2030. OCI’s carbon-chemicals unit can extend into raw materials / films. TERLI, TaiyangNews

4. Shrinking / disappearing materials

• Aluminum paste: used for PERC back BSF. With N-type adoption, top of the ‘sharply declining’ list.
• Commodity P-type polysilicon: 6N–9N grade losing ground — a positive for OCI as low-end Chinese supply demand shrinks while high-purity demand concentrates.

5. Bottleneck — the silver dilemma

• PERC used silver only on the front (~10 mg/W). TOPCon uses both sides; low-temperature paste needs more silver — early tandem/HJT cells hit 20–25 mg/W.
• Response: SMBB (super multi-busbar) thin-electrodes and copper plating as silver substitutes. TaiyangNews — Silver savings
• Outlook: near-term rise, mid-/long-term flat-to-down. OCI doesn’t make silver, but silver spikes raise module prices and choke market growth — critical for OCI’s downstream.

6. OCI strategic response

6.1 Semiconductor-solar convergence

OCI is shifting weight toward semiconductor materials. It can look like solar retrenchment, but tandem manufacturing increasingly resembles semiconductor processes (thin-film deposition, precision cleans, etching). Capabilities developed for semi-grade HCDS, phosphoric acid and hydrogen peroxide directly translate into tandem material competitiveness. OCI R&D, OCI IR deck

6.2 Non-China supply-chain moat

The US IRA and UFLPA exclude Xinjiang polysilicon — OCI’s hydro-powered Malaysian polysilicon enjoys a near-‘free pass’ in the US market. Add the Vietnamese wafer JV and Texas Mission Solar module expansion, and OCI completes a Malaysia (polysilicon) → Vietnam (wafer) → US (cells/modules) non-China vertical chain. PV Tech — Vietnam wafer, PV Magazine — 2.7GW factory

6.3 R&D and new businesses

The CubicPV partnership upgrades OCI from supplier to innovation partner. Existing chemistry strengths give OCI optionality to extend into tandem precursors and encapsulant raw materials/films.

7. Summary — material-by-material outlook