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Analysis of Si/SiGe/Si double heterojunction band of a novelstructure of PIN electronic modulation

Feng Song Xue Bin Li Lian-Bi Zhai Xue-Jun Song Li-Xun Zhu Chang-Jun

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Analysis of Si/SiGe/Si double heterojunction band of a novelstructure of PIN electronic modulation

Feng Song, Xue Bin, Li Lian-Bi, Zhai Xue-Jun, Song Li-Xun, Zhu Chang-Jun
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  • PIN is a common structure of electrical modulation in electro-optic modulator, and the performance of the electro-optic modulator is directly affected by the carrier injection in PIN structure. In previous studies, we have invented a novel structure of PIN electronic modulation based on SOI material. In the new structure, the SiGe material is adopted in the waveguide zone, therefore the double heterojunction PIN structure is formed in the horizontal direction. The carrier injection efficiency can be enhanced in the novel structure, and the power consumption could be reduced. In order to further study the modulation mechanism of the novel structure, based on the single heterojunction band theory, the barrier heights of the double heterojunction are analyzed, and the quantitative formulas of the barrier heights of the double heterojunction are given. It is shown that the barrier heights of the double heterojunction are related to the doping concentration, the band gap of material, the temperature, and the Ge content. The bands are compared between the novel structure, SiGe-OI structure and SOI structure to analyze the reason why the carrier injection of the novel structure could be enhanced. In the same conditions, the barrier heights of Si/SiGe/Si double heterojunction are minimal values, and those of SiGe and Si materials are second minimal value and maximal value, respectively. When the PIN device is set at a forward biased voltage (P region is the anode, and N region is the cathode), the balance between the carrier diffusion and the carrier drift is broken, and the PIN device is in a non-equilibrium state. According to the quantitative formula of the barrier heights of the double heterojunction, the barrier heights of Si/SiGe/Si double heterojunction are lower than that of SiGe-OI material, and the barrier height of SiGe material is lower than that of SOI material. It is shown that the barrier heights of Si/SiGe/Si double heterojunction could be flatten at first, so its PIN structure has the higher carrier injection than those of SiGe-OI and SOI under the same conditions. Finally, the band distribution of the novel structure and the relationships between the band distribution, the modulation voltage and the carrier injection are simulated. The results show that when the modulation voltage is 1 V, the carrier density of the novel structure arrives at 8×1018 cm-3, which is 800% higher than that of SOI structure, and 340% higher than that of SiGe-OI structure. The advantages of the novel structure are further indicated, and the correctness of the theoretical analysis is also verified.
      Corresponding author: Feng Song, vonfengs@163.com
    • Funds: Project supported by the National Natural Science Foundation of China (Grant No. 61204080), the Shanxi Provincial Higher Education Teaching Reform Project, China (Grant No. 15JK1292), the Doctoral Program Foundation of Xi'an Polytechnic University of China (Grant Nos. BS1128, BS1436), the Graduate Education "Quality Project" of Xi'an Polytechnic University of China (Grant No. 15yzl10), and the Special Funds of Key Disciplines Construction Project of Ordinary Universities of Shanxi Province, China (Grant No. (2008) 169).
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    Chang Y M, Dai C L, Cheng T C 2008 Appl. Surf. Sci. 254 3105

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    Xing Y R 1985 Chinese Journal of Semiconductors 6 362 (in Chinese) [邢益荣 1985 半导体学报 6 362]

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    People R, Bean J C 1986 Appl. Phys. Lett. 48 538

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  • [1]

    Yang L, Ding J F 2014 J. Lightwave Technol. 32 966

    [2]

    Xu H, Li X Y, Xiao X 2014 IEEE J. Sel. TOP. Quant. 20 3400110

    [3]

    Liu Y, Yu B, He B, Zhang G F, Xiao L T, Jia S T 2014 Chin. Phys. B 23 010101

    [4]

    Chen M J, Cheng J, Li M Q, Xiao Y 2012 Chin. Phys. B 21 064212

    [5]

    Liang S, Mei Z X, Du X L 2012 Chin. Phys. B 21 067306

    [6]

    Hua W, Liu S X 2014 Chin. Phys. B 23 020309

    [7]

    Akiyama S, Imai M, Baba, T Png 2013 IEEE J. Sel. TOP. Quant. 19 3401611

    [8]

    Qiu C, Xiao S, Yang B 2013 Optik 124 3436

    [9]

    Liu A, Jones R, Liao L 2014 Nature 4 615

    [10]

    Tu X, Zuo Y, Chen S 2008 Laser Phys. 18 438

    [11]

    Wu P, Clarke R E, Novak J 2013 IEEE J. Sel. TOP. Quant. 19 7900109

    [12]

    Rouifed M S 2014 IEEE J. Sel. TOP. Quant. 20 3400207

    [13]

    Li Y M, Liu Z, Xue C L 2013 Acta Phys. Sin. 62 114208 (in Chinese) [李亚明, 刘智, 薛春来 2013 物理学报 62 114208]

    [14]

    Feng S, Gao Y 2014 Chin J. Semiconductors 35 074010

    [15]

    Feng S, Jiang R K, Gao Y 2014 International Coference on Photonics and Optical Engineering, Xi'an, China, October 13-15, 2014 CP300-294

    [16]

    Feng S, Jiang R K, Gao Y 2014 International Conference on Optical Communications and Networks, Suzhou, China, November 9-10, 2014 6987152

    [17]

    Feng S Chinese Patent 2015105629372[P] [2015-9-8] (in Chinese) [冯松, 中国专刊 2015105629372[P] [2015-9-8]]

    [18]

    Rickman A 2014 Nat. Photonics 8 579

    [19]

    Gao Y, Feng S, Yang Y 2008 The 9th International Conference on Solid-State and Integrated-Circuit Technology, Beijing, China, October 10-13, 2008 p1058

    [20]

    Feng S, Gao Y 2014 Journal of Optoelectronics· Laser 25 870 (in Chinese) [冯松, 高勇 2014 光电子激光 25 870]

    [21]

    Chang Y M, Dai C L, Cheng T C 2008 Appl. Surf. Sci. 254 3105

    [22]

    Xing Y R 1985 Chinese Journal of Semiconductors 6 362 (in Chinese) [邢益荣 1985 半导体学报 6 362]

    [23]

    People R, Bean J C 1986 Appl. Phys. Lett. 48 538

    [24]

    Liu E K 2008 Semiconductor Physics (Vol. 5) (Beijing: Publishing House Of Electronics Industry) p185 (in Chinese) [刘恩科 2008 半导体物理学 (北京: 电子工业出版社) 第185页]

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  • Abstract views:  6735
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Publishing process
  • Received Date:  27 October 2015
  • Accepted Date:  17 November 2015
  • Published Online:  05 March 2016

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