Ultrafast Photodetection in the Quantum Wells of Single AlGaAs/GaAs-Based Nanowires
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- 作者：N. Erhard ; S. Zenger ; S. Mork枚tter ; D. Rudolph ; M. Weiss ; H. J. Krenner ; H. Karl ; G. Abstreiter ; J. J. Finley ; G. Koblm眉ller ; A. W. Holleitner
- 刊名：Nano Letters
- 出版年：2015
- 出版时间：October 14, 2015
- 年：2015
- 卷：15
- 期：10
- 页码：6869-6874
- 全文大小：357K
- ISSN：1530-6992
文摘
We investigate the ultrafast optoelectronic properties of single Al0.3Ga0.7As/GaAs core鈥搒hell nanowires. The nanowires contain GaAs-based quantum wells. For a resonant excitation of the quantum wells, we find a picosecond photocurrent which is consistent with an ultrafast lateral expansion of the photogenerated charge carriers. This Dember-effect does not occur for an excitation of the GaAs-based core of the nanowires. Instead, the core exhibits an ultrafast displacement current and a photothermoelectric current at the metal Schottky contacts. Our results uncover the optoelectronic dynamics in semiconductor core鈥搒hell nanowires comprising quantum wells, and they demonstrate the possibility to use the low-dimensional quantum well states therein for ultrafast photoswitches and photodetectors.