Patent ID: 9000783
Filing Date: 2015-04-07
Classification: G01N,H01L

Abstract:
1. A method for detecting metal ions in a solution comprising: providing a semiconductor device contacting a solution, said semiconductor device comprising at least one N-type material layer oriented in a first direction and covering a P-type material layer oriented in said first direction, and a dielectric layer disposed over said at least one N-type material layer and including an opening therethrouqh such that at least one contact part of said at least one N-type material layer directly contacts said solution; optically illuminating said semiconductor device thereby creating a voltage across a P/N junction and causing metal ions of said solution to migrate to said at least one contact part; monitoring conductance of a structure of said semiconductor device having a conductance that varies with an amount of said metal ions accumulated on said semiconductor device; and calculating a concentration of said metal ions in said solution, based on said conductance.