Patent ID: 9691603
Date: 2017-06-27
CPC Classifications: C09D,H01L

Claim:
1. A liquid chemical for forming a water repellent protective film, the liquid chemical being able to form a water repellent protective film on a wafer that has at its surface a finely uneven pattern and contains silicon element at least at a part of the uneven pattern, the water repellent protective film being formed at least on surfaces of recessed portions of the uneven pattern at the time of cleaning the wafer, comprising: a silicon compound (A) represented by the following general formula [1]; an acid that donates a proton to the silicon compound (A) and/or an acid that accepts electrons from the silicon compound (A); and a solvent in which the silicon compound (A) and the acid are dissolved, wherein the number of particles larger than 0.5 μm is not more than 100 per 1 mL of the liquid chemical, in a particle measurement conducted in a liquid phase of the liquid chemical by a light scattering type liquid-borne particle detector, wherein the total amount of water in the liquid chemical is no greater than 1000 mass ppm relative to the total amount of the liquid chemical wherein R