High performance resonant tunnelling structures on GaAs substrates

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MRS Advances ◽  
2019 ◽  
Vol 4 (5-6) ◽  
pp. 331-336
Author(s):  
Kenichi Kawaguchi ◽  
Tsuyoshi Takahashi ◽  
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Masaru Sato ◽  
Michihiko Suhara

AbstractTo improve the uniformity of type-II GaAsSb/InAs nanowires (NWs) grown on GaAs substrate using the position-controlled vapor-liquid-solid (VLS) method, the insertion of GaAs NW segments was investigated. In conventional InAs NWs grown directly on patterned GaAs substrate at 430°C, anomalous growth occurred in some pattern holes, and the proportion of holes having anomalous growth was in particular pronounced when a large Au catalyst diameter (80 nm) was employed, which indicates that the strain coming from the lattice-mismatched system affected the NW growth. With the insertion of GaAs segments, the yield of vertical NWs drastically improved for all pattern conditions. The uniformity of NWs was maintained after the growth of p-GaAsSb segments, and well-organized, two-dimensional arrays of type-II GaAsSb/InAs diode NWs were obtained. Moreover, the formation of p-n junctions at the GaAsSb/InAs interface was clearly observed using scanning capacitive microscopy. These results show that the investigated growth strategy is promising for the development of high-performance NW tunnel diodes.


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