Theoretical Analysis of Peak to Valley Ratio in Current Density for Double-Barrier Structures with Outer-Wells

Hiroyuki TAKURA  Hiroaki YAMAMOTO 

Publication
C - Abstracts of IEICE TRANSACTIONS on Electronics (Japanese Edition)  Vol.J90-C  No.2  pp.134-142
Publication Date: 2007/02/01
Online ISSN: 1881-0217
Print ISSN: 1345-2827
Type of Manuscript: PAPER
Category: 
Keyword: 
resonant tunneling,  pre-well,  outer-wells,  transmission coefficient,  peak to valley ratio, 

Full Text(in Japanese): PDF(427.8KB)

Summary: 
Analytical expressions for the tunneling transmission coefficient and the resonance condition are derived in the rectangular double-barrier structures with outer-wells. It is confirmed that the resonance condition depends mainly on the central well. We have calculated the current density for both the symmterical and the asymmetrical structures with pre-well, with outer-wells, or without outer-well. It is found that the value of peak to valley ratio in current density for symmetrical double-barrier structures with outer-wells is better than that with pre-well, and that outer-wells added to the asymmetrical structures improve moreover the value of peak to valley ratio.