From Event: SPIE Optical Engineering + Applications, 2018
The effects of lattice point defects on the absorption of incident photons in a single-quantum-well
system are investigated by using a quantum-statistical theory. Our self-consistent theoretical
model includes the defect-induced vertex correction to an unscreened dynamical polarization
function of doped electrons under the ladder approximation. Meanwhile, the intralayer dynamical
screening to the Coulomb interaction between charged point defects and conduction
electrons are also taken into account within the random-phase approximation. The numerical
results for nonlinear variations in absorption spectra by defects are demonstrated and analyzed
for various defect densities. The combination of the current theory with a space-weather forecast
model will enable novel designs of satellite onboard electronic and optoelectronic devices with
radiation-hardening protection and extended lifetimes. More specifically, this theory facilitates
a better characterization of photodetectors not only for high quantum efficiency and low dark
current density but also for radiation tolerance or mitigation of radiation damage.
D. H. Huang, A. Iurov, F. Gao, G. Gumbs, and D. A. Cardimona, "Microscopic theory for point-defect effects on photon absorption in quantum-well systems," Proc. SPIE 10766, Infrared Sensors, Devices, and Applications VIII, 1076603 (Presented at SPIE Optical Engineering + Applications: August 22, 2018; Published: 18 September 2018); https://doi.org/10.1117/12.2318562.
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