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Ultrafast photocurrents and THz generation in single InAs‐nanowires
Author(s) -
Erhard Nadine,
Seifert Paul,
Prechtel Leonhard,
Hertenberger Simon,
Karl Helmut,
Abstreiter Gerhard,
Koblmüller Gregor,
Holleitner Alexander W.
Publication year - 2013
Publication title -
annalen der physik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.009
H-Index - 68
eISSN - 1521-3889
pISSN - 0003-3804
DOI - 10.1002/andp.201200181
Subject(s) - photocurrent , nanowire , optoelectronics , materials science , ultrashort pulse , terahertz radiation , photoconductivity , optics , laser , physics
To clarify the ultrafast temporal interplay of the different photocurrent mechanisms occurring in single InAs‐nanowire‐based circuits, an on‐chip photocurrent pump‐probe spectroscopy based on coplanar striplines was utilized. The data are interpreted in terms of a photo‐thermoelectric current and the transport of photogenerated holes to the electrodes as the dominating ultrafast photocurrent contributions. Moreover, it is shown that THz radiation is generated in the optically excited InAs‐nanowires, which is interpreted in terms of a dominating photo‐Dember effect. The results are relevant for nanowire‐based optoelectronic and photovoltaic applications as well as for the design of nanowire‐based THz sources.