期刊
NANOSCALE RESEARCH LETTERS
卷 9, 期 -, 页码 -出版社
SPRINGEROPEN
DOI: 10.1186/1556-276X-9-245
关键词
Si nanorods; EFM; Photogenerated charging; Surface potential
资金
- Major State Basic Research Project of China [2011CB925601]
- National Natural Science Foundation of China [11274072]
- Natural Science Foundation of Shanghai [12ZR1401300]
Photogenerated charging properties of single Si nanorods (Si NRs) are investigated by electrostatic force microscopy (EFM) combined with laser irradiation. Under laser irradiation, Si NRs are positively charged. The amount of the charges trapped in single NRs as well as the contact potential difference between the tip and NRs' surface is achieved from an analytical fitting of the phase shift - voltage curve. Both of them significantly vary with the laser intensity and the NR's size and construction. The photogenerated charging and decharging rates are obtained at a timescale of seconds or slower, indicating that the Si NRs are promising candidates in photovoltaic applications.
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