Pnc Process Systems Co., Ltd.

Ultron Semiconductor (shanghai) Co., Ltd.

Zhengkai Lu

Ming Xu

Dawei Liu

Fangyi Lv

Chuanlong Liu

Panpan Li

Jing Zhang

Jie Wang

Yuan Jiang

Yilin Shen

Xinlai Chen

A method of controlling mixed liquid to be delivered for SPM solution includes: before the SPM solution comes into an acid scouring tank, mixing the sulfuric acid with the hydrogen peroxide in a delivering pipe in a first stage and a second stage in turn, so as to make a mixed liquid after mixing in the first stage to further get mixed in the second stage; heating the mixed liquid in the first stage; monitoring an oxygen concentration value of the mixed liquid flowing out after mixing in the first stage; and if the oxygen concentration value is smaller than an oxygen concentration value at full reaction, adding supplementary sulfuric acid and hydrogen peroxide during mixing in the second stage, so as to enable the oxygen concentration value of the mixed liquid flowing out after mixing in the second stage monitored in real time to reach an oxygen concentration value.

Method of controlling mixed liquid to be delivered for SPM solution

A liquid delivering system for wafer cleaning equipment includes an acid scouring tank, a sulfuric acid supplying source, a hydrogen peroxide supplying source, a first mixing device, a second mixing device and a feedback-control panel. The first mixing device and the second mixing device both includes a mixing duct, a multi-section mixing screw rod arranged inside the mixing duct and a heater wrapped around the mixing duct. By ways of adopting the above-mentioned technical solution, it is possible to realize fully mixing sulfuric acid with hydrogen peroxide in a mode of mixing in multi-stages, achieve precise control to temperature, and enable mixed liquid to fully react, thereby ensuring that the mixed liquid coming into the acid scouring tank meets cleaning requirements, and improving quality and efficiency of cleaning wafers.

Liquid delivering system for wafer cleaning equipment

Growing community of inventors

Shanghai, China

Zhengkai Lu