产品说明

一般描述

Improved HF Buffer System with stabilized HF activity - selective solvent for SiO2 used in semiconductor technology of planar passivated devices - transistors, integrated circuits, diodes, rectifiers, SCR, MOS, FET
Advantages:

• Ready-to-use - Economical
• HF activity buffer stabilized
• Excellent process reproducibility
• Does not undercut masked oxide
• Will not stain diffused silicon surfaces
• Avoids contamination on silicon surfaces
• Photoresist coating unaffected

Buffer HF improved is an idealized buffer preparation characterized by a high buffer index and an optimized, uniform oxide-etch rate. The composition of buffer HF improved is precisely controlled by HF activity measurements and electrometric pH. The mass balance corresponds essentially to (HF) + (F) + 2(HF₂) for a two-ligand mononuclear complex and the charge balance is (H⁺) - (F) + (HF^2- ). The HF activity is maintained constant through the specific equilibrium constant which regulates the equilibrium reaction between fluoride, bifluoride, and HF buffer components. A second equilibrium constant participates in the regulation of the hydronium in concentration of pH.
Buffer HF improved is produced and analyzed to be essentially free of impurities. Nitrate ions, a common impurity causing stains on diffused silicon surfaces, are specifically removed. Heavy metal impurities, which can lead to degradation of device characteristics, are rigidly controlled under manufacturing process specifications.

应用

Use of Buffer HF improved:

• Buffer HF improved dissolves silica films (both thermally grown and silane SiO₂) produced on the surfaces of silicon and exposed by photolithography. It also is capable of dissolving doped silica films such as phosphosilica and borosilica glasses as formed in semiconductor processing. The overall chemical reaction is: 4HF + SiO₂ SiF₄ + 2H₂O
• For trouble-free operation Buffer HF improved is recommended in the new technologies for manufacture of semiconductor planar and mesa devices. It is compatible with both negative and positive photoresists. Excellent results with good reproducibility are simple to achieve without undercutting marked oxides, surface staining or device degradation by metallic impurities.

制备说明

Instructions:
Most practical oxide passivation layers range from 2000 Å to 5000 Å in thickness, and good results are obtained by exposure in Buffer HF improved for 2 to 5 minutes at room temperature. Exposure time may be decreased or increased if necessary. Buffer HF improved should be rinsed off with deionized water. The high buffer index of Buffer HF improved permits repeated use of the buffer at fixed exposure time. For faster etch rate (approx. 2X) use Buffer HF improved at 35 ℃.

基本信息

NACRES

NA.23

产品性质

形式	liquid
颜色	colorless
pH值(酸碱度)	3-5

安全信息

象形图
警示用语：	Danger
危险声明	H300 + H310 + H330 - H314
预防措施声明	P260 - P270 - P280 - P303 + P361 + P353 - P304 + P340 + P310 - P305 + P351 + P338
危险分类	Acute Tox. 1 Dermal - Acute Tox. 2 Inhalation - Acute Tox. 2 Oral - Eye Dam. 1 - Skin Corr. 1A
储存分类代码	6.1B - Non-combustible, acute toxic Cat. 1 and 2 / very toxic hazardous materials
WGK	WGK 2
闪点(F)	Not applicable
闪点(C)	Not applicable