High-Purity Nitrous Oxide (N₂O) — Dual Applications in Semiconductor CVD and OLED Encapsulation

Applications and Uses

High-purity nitrous oxidehas two primAry applications. In semiconductor manufacturing, it serves as a critical oxygen source in CVD processes for growing high-quality silicon dioxide insulating films. In display manufacturing, high-purity N₂O reacts with silane to form dense SiON barrier layers in the TFE (thin-film encapsulation) process for flexible OLED displays. The water and oxygen barrier capability of these layers directly affects the bending of flexible screens.

Market Conditions and Shifts

The nitrous oxide market is experiencing price divergence across different purity grades. As of March 2026, photovoltaic-grade N₂O prices stabilized at RMB 9.5/kg. Semiconductor-grade N₂O, which requires higher purity (typically 6N grade) and faces thicker technical barriers, maintains higher pricing. Prices for 99.9995% purity N₂O range from RMB 8–10/kg, while 99.99999% purity N₂O ranges from RMB 18–30/kg.

The Chinese nitrous oxide industry market reached approximately RMB 4.762 billion (USD 653 million) in 2024, up 12.87% year-on-year. The electronics and semiconductor sectors, which have the highest purity requirements (typically 6N grade) and thickest technical barriers, are becoming the core engine driving the industry toward higher value chain positions.

Technology Transition: From Photovoltaic to Semiconductor Grade

The N₂O market is experiencing a technology transition from photovoltaic-grade to semiconductor-grade products. While photovoltaic-grade N₂O (typically 4N–5N purity) is sufficient for solar cell manufacturing, semiconductor applications require 6N purity or higher. The technical barriers for achieving 6N purity — including moisture control, metal ion reduction, and particle filtration — are substantially higher than for photovoltaic-grade production. As OLED display manufacturing expands and semiconductor process nodes advance, demand for semiconductor-grade N₂O is expected to grow faster than the overall market.