Pumping-beam-induced photovoltaic effect on the photoreflectance of a delta-doped GaAs film

NCU Institutional Repository > 理學院 > 物理研究所 > 期刊論文 > Item 987654321/39190

jsp.display-item.identifier=請使用永久網址來引用或連結此文件: http://ir.lib.ncu.edu.tw/handle/987654321/39190

题名:	Pumping-beam-induced photovoltaic effect on the photoreflectance of a delta-doped GaAs film
作者:	Wang,DP;Chen,CC;Shen,TL;Hsu,TM;Lee,WC
贡献者:	物理研究所
关键词:	FRANZ-KELDYSH OSCILLATIONS;ELECTRIC-FIELD;DEPLETION REGION;SPECTROSCOPY
日期:	1996
上传时间:	2010-07-08 14:07:45 (UTC+8)
出版者:	中央大學
摘要:	The photoreflectance (PR) spectroscopy of a delta-doped GaAs film has been measured at 300 K. Results reveal many Franz-Keldysh oscillations (FKOs) above the band-gap energy, which will enable the electric-field strength to be determined from the periods of FKOs. Since the photovoltaic effect cannot be neglected in PR measurements when using light as both the pumping and probing beams, it is generally assumed that the modulation field delta F is much smaller than the built-in field F so that the periods of the FKOs will not be affected by the pumping beam, However, the induced photovoltage can be over 2/3 of Fermi level at low temperatures and cannot be neglected even at room temperature. Hence, the finite value of delta F needs to be taken into consideration. The effect of delta F on the shapes of PR is discussed, and it is shown that the FKOs of PR oscillate at a frequency corresponding to F-delta F/2. (C) 1996 American Institute of Physics.
關聯:	JOURNAL OF APPLIED PHYSICS
显示于类别:	[物理研究所] 期刊論文

文件中的档案:

档案	描述	大小	格式	浏览次数
index.html		0Kb	HTML	440	检视/开启

在NCUIR中所有的数据项都受到原著作权保护.

社群 sharing