期刊
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
卷 -, 期 -, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/pssa.202300575
关键词
InP resonant tunneling diodes; nonequilibrium Green's function; quantum transport simulations; THz emitters; triple-barrier resonant tunneling diodes
This study focuses on the potential of resonant tunneling diodes for THz applications and optimizes the RF output power and cut-off frequency by adjusting the layer stack design of the devices. The trade-off between collector spacer thickness and doping profile is observed.
Upcoming THz applications require compact, robust, and efficient sources with high output-power. Among electronic devices, resonant tunneling diodes are a promising candidate for THz operation. Triple-barrier resonant tunneling diodes provide a high degree of design and operation freedom. Zero-bias detection and THz emission are possible with the same device due to the asymmetric structure and IV curve. However, more investigations in the layer stack design are required. An investigation is presented into the effect of collector spacer thickness and doping profile in the subcollector contact region. The aim is to simultaneously optimize the RF output-power and cut-off frequency in triple-barrier structures. A series of devices with different collector spacers and two distinct doping profiles are fabricated. A trade-off between collector spacer thickness and doping profile for either higher output power or cut-off frequency is observed. In addition, the simulation results are presented from a nonequilibrium Green's function solver implemented in Python. Herein, a need for accurate determination of the extent of the nonequilibrium region to achieve simulation results matching the IV measurements is observed.
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