Abstract: The invention relates to the elaboration of an electrode comprising an electrochrome polymer.The invention provides an electrode coated with a polymer film obtained by electrochemical polymerization of a monomer M, said polymer corresponding to the general formula (M.sup.+ X.sup.- y)n where X.sup.- represents an anion coming from the electrolyte used for the polymerization, the monomer being either a substituted aromatic heterocycle with 5 links containing a single hetero-atom, or an indole substituted on the phenyl nucleus, the substitutions being possibly groups of the alkyl, alkoxyl, hydroxyl, aryl, substituted aryl, halogene, trihalogenomethyl, cyano, amino or dialkylamino type.

Abstract: In a method for determining the physical characteristics of a silicon wafer, one side of the wafer (4) is removably fixed to the base (2) of a container (1) so as to close off a hole (3) therein. An electrical connection to this side of the wafer (4) is made thru the hole (3). The wafer (4) forms the working electrolyte of a cell comprising an electrolyte contained in the container (1). An auxiliary electrode (14) is removably placed in the electrolyte. The method and the device implementing it can be used to determine the crystallographic and electrical characteristics of a sample of silicon.