Near infrared microscopy for the determination of dopant distributions and segregation in n-type/InP

The authors present an analytical technique for rapid determination of the free charge carrier density and distribution on both a micro- and macroscale in n-type InP. This technique, based on the near infrared absorption characteristics of free carriers, is applied to the microscale analysis of liquid encapsulated Czochralski (LEC) and liquid encapsulated Kryopoulos (LEK) grown InP crystals as a demonstration of its capabilities. Due to its nondestructive nature, the technique is well suited to substrate qualification inspection before device fabrication and as a tool for crystal growth characterization. >