中国物理B ›› 2010, Vol. 19 ›› Issue (11): 117303-117305.doi: 10.1088/1674-1056/19/11/117303

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Electron tunneling effects on radiative recombination in modulation n-doped ZnSe/BeTe type-II quantum wells

冀子武1, 郑雨军1, 徐现刚2   

  1. (1)School of Physics, Shandong University, Jinan 250100, China; (2)State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
  • 收稿日期:2010-03-17 修回日期:2010-06-22 出版日期:2010-11-15 发布日期:2010-11-15
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 10844003 and 10874101), the Natural Science Foundation of Shandong Province, China (Grant No. Y2008A10), and the National Basic Research Program of China (Grant No. 2009CB930503).

Electron tunneling effects on radiative recombination in modulation n-doped ZnSe/BeTe type-II quantum wells

Ji Zi-Wu(冀子武)a), Zheng Yu-Jun(郑雨军)a), and Xu Xian-Gang(徐现刚) b)   

  1. a School of Physics, Shandong University, Jinan 250100, China; b State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
  • Received:2010-03-17 Revised:2010-06-22 Online:2010-11-15 Published:2010-11-15
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 10844003 and 10874101), the Natural Science Foundation of Shandong Province, China (Grant No. Y2008A10), and the National Basic Research Program of China (Grant No. 2009CB930503).

摘要: We have studied the cyclotron-resonance absorption and photoluminescence properties of the modulation n-doped ZnSe/BeTe/ZnSe type-II quantum wells. It is shown that only the doped sample shows electron cyclotron-resonance absorption. Also, the undoped sample shows two distinctive peaks in the spatially indirect photoluminescence spectra, and the doped one shows only one peak. The results reveal that the high concentration electrons accumulated in ZnSe quantum well layers from n-doped layers can tunnel through BeTe barrier from one well layer to the other. The electron concentration difference between these two well layers originating from the tunneling results in a new additional electric field, and can cancel out a built-in electric field as observed in the undoped structures.

Abstract: We have studied the cyclotron-resonance absorption and photoluminescence properties of the modulation n-doped ZnSe/BeTe/ZnSe type-II quantum wells. It is shown that only the doped sample shows electron cyclotron-resonance absorption. Also, the undoped sample shows two distinctive peaks in the spatially indirect photoluminescence spectra, and the doped one shows only one peak. The results reveal that the high concentration electrons accumulated in ZnSe quantum well layers from n-doped layers can tunnel through BeTe barrier from one well layer to the other. The electron concentration difference between these two well layers originating from the tunneling results in a new additional electric field, and can cancel out a built-in electric field as observed in the undoped structures.

Key words: type-II quantum wells, cyclotron resonance, photoluminescence, electron tunneling

中图分类号:  (Tunneling)

  • 73.40.Gk
73.63.Hs (Quantum wells) 78.55.Et (II-VI semiconductors) 78.67.De (Quantum wells)