Spot prices for 4-inch indium phosphide substrates climbed from around RMB4,400 to RMB7,000 per unit in September 2026, according to SMM data cited by UBS, as acute supply tightness bolstered producer pricing power. Three-inch substrate prices similarly rallied from RMB2,500 to RMB4,000 per unit, prompting UBS to model near-term contract price hikes of 20% to 40% for JX Advanced Metals. To satisfy high-speed 1.6T transceiver roadmaps, optical component manufacturers are demanding large-diameter 6-inch substrates. Optical leader Coherent highlighted that migrating from 3-inch to 6-inch wafers more than quadruples device yield per wafer while roughly halving unit production costs. However, supplying 6-inch wafers requires compound semiconductor manufacturers to master entirely new crystal growth physics under severe thermal stress. While JX Advanced Metals historically utilized liquid encapsulated Czochralski (LEC) pulling for smaller wafers, 6-inch fabrication forces a transition to vertical gradient freeze (VGF) solidification, where the firm lacks mass-production experience. Controlling phosphorus volatilization and thermal stress across larger diameters triggers steep yield penalties during initial scaling. Furthermore, commissioning ¥120bn in new capacity will expand depreciation charges, while depleting low-cost legacy indium stockpiles will elevate raw material costs. Consequently, UBS forecasts JX Advanced Metals' InP operating profit will rise from ¥3bn in FY3/27 to ¥10bn in FY3/28 and ¥16bn in FY3/29, but expects operating margins to peak at 42% in FY3/28 and erode thereafter as rival supply curbs pricing power. #
Commodities# #
Materials# Report date: 2026-10-15