Antimonide Photonic Power Converters Assembled Through Micro-Transfer Printing
Abstract
This report details the design of a GaSb-based photonic power converter (PPC) which generates electrical power from eyesafe radiation. Devices were simulated in NRL MULTIBANDS (registered trademark) and optimized to maximize power conversion efficiency under 1550 nm monochromatic light. The highest efficiency was predicted for a device alloyed with a small amount of aluminum which increased the bandgap and maximized the voltage of the device. Simulated devices were grown by molecular beam epitaxy and processed in NRLs Nanoscience Institute. Although predicted performance of devices with AlGaSb was higher than GaSb, actual performance suffered due to low minority carrier lifetimes. This indicates that epitaxial material quality of low Al-containing antimonides needs optimization. In parallel to device optimization, the process for micro-transfer printing of antimonides was investigated using previously developed selective etch chemistries. Antimonide membranes were released from their native substrates and printed onto silicon handles. Increasing the temperature of the selective etch bath was found to decrease the time to release 200 x 200 micrometers membranes without adversely impacting etch selectivity.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 21, 2023
- Accession Number
- AD1211213
Entities
People
- Margaret A. Stevens
Organizations
- United States Naval Research Laboratory