光学学报, 2009, 29 (8): 2343, 网络出版: 2009-08-17   

抽运-探测反射技术研究本征CdTe的载流子动力学

Carrier Dynamics of Intrinsic CdTe by Pump-Probe Reflection Spectroscopy
作者单位
上海大学理学院物理系 上海 200444
摘要
采用抽运-探测反射技术, 研究了室温下本征CdTe晶体的光致非平衡载流子布局与光子能量和抽运光强的关系。根据实验结果, 发现随着抽运光光子能量的提高, 快过程在载流子弛豫过程中所占的比例增大; 随着抽运光功率的提高, 反射率随之增大, 快过程时间常数也随之增大。通过建立简单的本征半导体受激载流子弛豫过程模型, 讨论了载流子散射、载流子-声子相互作用和载流子复合等的贡献。在抽运光光子能量为1.49 eV(比CdTe的禁带宽度约高20 meV)时, 通过双指数函数拟合, 得到了本征CdTe中载流子弛豫过程的快、慢时间常数, 分别为2.8 ps和158.3 ps。
Abstract
The transient carrier dynamics of intrinsic CdTe was investigated by time-resolved femtosecond pump-probe reflection spectroscopy method (PPR) at different wavelengths and powers. The experimental results show that the percentage of the rapid process in carrier relaxation process grows with the increase of the pumped photon energy. The rapid process constant and reflectivity increase when the pumped optical power increases. The model of ultrafast carrier dynamics in intrinsic semiconductor was developed, and the effects of carrier initial scattering, carrier-LO phonon interaction and carrier trapping on carrier relaxation properties were analyzed. The curve of the PPR at the photon energy of 1.49 eV (~20 mV more than the band gap of CdTe ) is measured, the fast time constant and the slow one are 2.8 ps and 158.3 ps respectively.
参考文献

[1] C.Rulliere. Femtosecond Laser Pulses Principles and Experiments (2nd edition)[M]. Beijing: Scienc Press. 2007, 223~280

[2] Jagdeep Shah, Ultrafast Spectroscopy of Semiconductors and Semiconductor Nanostructures [M], Springer, 1999,135~160

[3] M. Schall, P. Uhd Jepsen. Above-band gap two-photon absorption and its influence on ultrafast carrier dynamics in ZnTe and CdTe[J], Appl. Phys. Lett., 2002,80(25): 4771~4773

[4] Lázaro A. Padilha Jie Fu, David Hagan et al..Two-photon absorption in CdTe quantum dots[J], Optics Experess, 2005,13(17): 6460~6467

[5] . . Cadmium telluride bulk crystal as an ultrafast nonlinear optical switch[J]. Appl. Phys. Lett., 2005, 87(25): 251110-1.

[6] . V.Kimel,V.V.Pavlov,R.V. Pisarev et al.. Ultrafast dynamics of photo-induced magneto-optical Kerr effect in CdTe at Room-temperature[J]. Phys. Rev. B, 2000, 62(16): R10610-R10613.

[7] . Nah′alkov′a, Spin dynamics in bulk CdTe at room temperature[J]. Materials Science and Engineering B, 2006, 126: 143-147.

[8] 李丹, 杨合晴, 梁春军 等, InP纳米颗粒的超快动力学和光学非线性[J].光谱学与光谱分析. 2006,26(9): 1742~174

    Li Dan, Yang He-qing, Liang Chunjun et al.. Transient dynamics of excited states and nonlinear optical properties of inP nanoparticle[J]. Spectroscopy and Spectral Analysis, 2006,26(9): 1742~174

[9] 刘国栋, 王贵兵, 付博 等.单晶硅表面载流子动力学的超快抽运探测 [J].中国激光, 2008,35(9): 6631~9631

    Liu Guodong, Wang Guibing, Fu Bo et al.. Ultrafast pump-probe reflectivity study of carrier dynamics in silicon surface[J]. Chinses J. Lasers, 2008,35(9): 6631~9631

[10] . . Size-dependent optical properties and carriers dynamics in CdSe/ZnS quantum dots[J]. Chinese Physics B, 2008, 17(4): 1280-1286.

[11] Haiyu Sang, Ming Li, Xiangyang Yu et al.. Study of intensity-dependent nonlinear optical coefficients of GaP optical crystal at 800 nm by femtosecond pump-probe experiment[J].Chin. Opt. Lett., 2006,4(9): 536~538

[12] . -K. Sun, F. Valle′e, S. Keller et al.. Femtosecond studies of carrier dynamics in InGaN[J]. Appl. Phys. Lett., 1997, 70(15): 2004-2006.

[13] . S. Prabhu A. S. Vengurlekar. Dynamics of the pump-probe reflectivity spectra in GaAs and GaN[J]. J. Appl. Phys., 2004, 95(12): 7803-7811.

[14] . Probing ultrafast carrier and phonon dynamics in semiconductors[J]. J. Appl. Phys., 1998, 83(4): 1789-1828.

[15] 文锦辉, 陈颖宇, 黄淳 等.低温生长GaAs非平衡载流子的超快动力学特性[J].红外与毫米波学报, 1999,18(3): 195~200

    Wen Jinhui, Chen Yingyu, Huang Chun et al.. Ultrafast carrier dynamics of low-temperature-grown gaAs,[J]. J. Infrared Millim. Wave, 1999,18(3): 195~200

金钻明, 马红, 李栋, 马国宏. 抽运-探测反射技术研究本征CdTe的载流子动力学[J]. 光学学报, 2009, 29(8): 2343. Jin Zuanming, Ma Hong, Li Dong, Ma Guohong. Carrier Dynamics of Intrinsic CdTe by Pump-Probe Reflection Spectroscopy[J]. Acta Optica Sinica, 2009, 29(8): 2343.

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