DE961365C - Electrical semiconductor made from selenium, especially for dry rectifiers - Google Patents

Description

Electric half-liter made of selenium, especially for dry rectifiers The quality of a selenium rectifier depends on the degree of purity of the product used the semiconductor layer used selenium of the type and amount of that mixed with the selenium other ingredients. It has already been suggested that for education of the semiconductor layer, molten selenium used a halogen, e.g. B. chlorine or Iodine, to be mixed in, the amount of halogen added within the limits o, i and 5 percent by weight should be.

According to the present invention, an electrical semiconductor is made from Selenium, especially for dry rectifiers, manufactured in such a way that the Selenium has a chlorine content of 0.003 to 0.08 percent by weight, namely at Use of such a semiconductor for a rectifier; the one support base plate of nickel-plated iron, preferably a: chlorine content of about o, oI to o, oI5%, and for a selenium rectifier with a support base made of aluminum, preferably a chlorine content of about 0.03 0 / o, because it has been shown that the level of chlorine content that is advantageous for the manufacture of selenium rectifiers is also conditioned by the choice of the carrier metal.

It has already become known that iodides are used in selenium rectifiers To use semiconductors or selenium. The use of chlorine as a halogen additive has however, the advantage that the halogen "is bound more stably in the selenium, so that a such rectifier has greater resistance to aging. It has also already been proposed, a selenium of commercial purity Add selenium chloride or selenium bromide or both selenium compounds or one Halogen compound, preferably through a chemical reaction with the selenium forms selenium chloride or selenium bromide at elevated temperatures.

According to the present invention, the particular compliance is a Preparation of selenium chlorine or selenium bromur as an additive or the special steering the process of combining selenium with a halogen compound to produce it the specified chemical compound in the sense of selenium chloride or selenium bromide not mandatory.

The introduction of chlorine into the selenium can take place, for example by introducing gaseous chlorine into molten selenium or by application a suitable chlorine compound in the production of selenium, which is the content supplies of chlorine in the selenium.

It is not necessary that the semiconductor layer consist exclusively of purified chlorine-containing selenium is formed, with the chlorine content within the specified limits. Instead, you can also use commercially available pig iron taking into account its analytically determined chlorine content by adding a calculated Amount of selenium with a certain chlorine content for the manufacture of selenium rectifiers Obtain very useful selenium whose total chlorine content is within the holds specified limits.

Claims (2)

PATENT CLAIMS: I. Electrical semiconductors made from selenium, in particular for dry rectifiers, characterized in that the selenium has a chlorine content from 0.003 to 0.08 percent by weight, when using the semiconductor for a rectifier with a support base made of nickel-plated iron, preferably a chlorine content of about 0.01 to 0.015%, with a support base made of aluminum preferably a chlorine content of about 0.03%. 2. Electrical semiconductor according to claim I, characterized in that it consists partly of commercially available raw selenium and partly of purified selenium, the chlorine content of which is matched to the analytically determined chlorine content of the raw selenium so that the chlorine content of the mixture is within the limits 0.003 and 0 , 08 ° / a holds. Documents considered: German Patent No. 742 935; Swiss patents No. 192 682, 203: 236; Swedish Patent Specification No. ioo 881; British Patent No. 468 736.