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PROJECT TITLE :

Characterization of surface defects on Be-implanted GaSb

ABSTRACT:

Characteristics of ion implantation induced damage in GaSb, and its removal by rapid thermal annealing, are investigated by cross-sectional transmission electron microscopy. Rapid thermal annealing (RTA) has been implemented on implanted GaSb for various temperatures and durations with the semiconductor capped, which avoids Sb out-diffusion and Ga agglomeration during the process. The RTA damage induced in the GaSb wafer was studied by scanning electron microscopy and energy dispersive x-ray spectroscopy. The results of the microscopy study were then used to optimize the RTA recipe and the Si3N4 capping layer thickness to achieve doping activation while minimizing crystalline damage. Results indicate a lattice quality that is close to pristine GaSb for samples annealed at 600 °C for 10 s using 260 nm thick Si3N4 capping layer. Secondary ion mass spectrometry measurement indicates that the implanted Be does not migrate in the GaSb at the used annealing temperature. Finally, electrical characteristics of diodes fabricated from the implanted material are presented that exhibit low series resistance and high shunt resistance suitable for photovoltaic applications.


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