Question

In a grown junction type construction, the method used form a junction transistor is_________

(a) alloy type diffusion

(b) mesa type

(c) speed variation method

(d) fused junction type

I got this question in an international level competition.

I'm obligated to ask this question of Transistor Construction topic in chapter Transistor Characteristics of Electronic Devices & Circuits

Answer 1

Correct answer is (c) speed variation method

Explanation: The grown junction may be formed by suddenly varying the rate of pulling the seed crystal from the melt. This method is based on the fact that proportion in which N and P type impurities crystallise i.e.., enter the grown crystal depends on the rate of pulling.