Sensors and Electron Devices Directorate Research Areas

Novel Semiconductor Structures and Devices for Optoelectronics, Photonics, and Optical Signal

Advisor: Shen, Paul (paul.shen@us.army.mil 301-394-1531)
Keywords: Novel semiconductors; Quantum wells; Optical signal processing; Crystal superlattices; Photonics;

Optoelectronics; Heterostructures and heterojunctions; Molecular beam epitaxy
New classes of solid-state, quantum-well devices offer the possibility of ultrahigh-speed (picosecond) switching and ultrahigh-frequency (>100 GHz) operation for diverse microelectronic and photonic applications. SEDD is studying the properties of strained layer semiconductor structures that promise novel electronic and optical properties. In addition, we are investigating spatial light modulators, waveguide modulators, waveguides, lasers, and high-speed electronics. These heterostructures are designed and processed into prototype test structures to demonstrate proof-of-principle devices.
We have complete facilities for optoelectronic device design, fabrication, and testing. Research focuses on (1) studying molecular beam epitaxy for novel semiconductor heterostructure growth for higher performance and new functionality, and (2) developing sophisticated semiconductor device-processing technology for nanoscale device fabrication. Specific technology areas consist of ultrahigh-resolution electron-beam lithography, magnetron-ion etching, electron-cyclotron resonance, plasma-enhanced chemical vapor deposition of dielectrics, and metal contact formation. Microanalytical test facilities are available for semiconductor structure characterization, including secondary ion mass spectrometry, scanning electron microscopy, transmission electron microscopy, Rutherford backscattering, AEM, glow discharge mass spectroscopy, photoreflectance, photoluminescence, and Raman spectroscopy. Facilities are also available for DC, RF, and optical testing of devices and circuits. Research opportunities exist in the areas of epitaxial materials growth; and electronic and photonic device design, modeling, fabrication, and characterization. Emphasis placed on technology related to photodetectors, lasers, high-electron mobility transistors, and mesoscopic devices.