Enhancement of quantum efficiency in thin photodiodes through absorptive resonance
- 1 March 1991
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in Journal of Lightwave Technology
- Vol. 9 (3), 321-328
- https://doi.org/10.1109/50.70007
Abstract
The spectral response of resonantly enhanced photodiodes is analyzed theoretically and verified experimentally. Comprehensive design guidelines and formulas are given for device structures containing a metal reflector, a contact layer, and optional grading layer, an absorbing layer, and a quarter-wave stack (QWS). The analysis shows, for instance, that the quantum efficiency of a Schottky photodiode with a 162-nm GaInAs absorbing layer can be enhanced 3.7-fold by using a 41-layer AlInAs/AlGaInAs QWS. The number of layers required could be much lower for other material systems and/or if the substrate is removed. Experimentally, 50% enhancement is demonstrated for a 475-nm-thick absorbing layer at 1.52 mu m by using a 16-layer QWS. The resonance width is approximately 4.4%.<>Keywords
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