Design and performance of cryogenic wafer prober

Abstract
This paper describes a probing system to test a wafer immersed in liquid helium. This system is intended to improve the following three functions in comparison with conventional systems: (1) measurement of fast rise‐time electrical signals, (2) quick release of flux trapping with small loss of liquid helium, (3) facility in exchanging wafers. It was observed that signals with 2‐ns rise time could transmit through the system, the release of flux trapping could be achieved in several minutes with negligible helium loss using a cryoinsert with a closable hole at its bottom, and wafers could be exchanged similarly.

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