Time-Resolved Photoinduced Thermoelectric and Transport Currents in GaAs Nanowires
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- 作者：Leonhard Prechtel ; Milan Padilla ; Nadine Erhard ; Helmut Karl ; Gerhard Abstreiter ; Anna Fontcuberta I Morral ; Alexander W. Holleitner
- 刊名：Nano Letters
- 出版年：2012
- 出版时间：May 9, 2012
- 年：2012
- 卷：12
- 期：5
- 页码：2337-2341
- 全文大小：325K
- 年卷期：v.12,no.5(May 9, 2012)
- ISSN：1530-6992
文摘
In order to clarify the temporal interplay of the different photocurrent mechanisms occurring in single GaAs nanowire based circuits, we introduce an on-chip photocurrent pump鈥損robe spectroscopy with a picosecond time resolution. We identify photoinduced thermoelectric, displacement, and carrier lifetime limited currents as well as the transport of photogenerated holes to the electrodes. Moreover, we show that the time-resolved photocurrent spectroscopy can be used to investigate the drift velocity of photogenerated carriers in semiconducting nanowires. Hereby, our results are relevant for nanowire-based optoelectronic and photovoltaic applications.