標題: Relaxation mechanisms of the photoelectrons in the second miniband of a superlattice structure
作者: Chen, CC
Chen, HC
Hsu, MC
Hsieh, WH
Kuan, CH
Wang, SY
Lee, CP
電子工程學系及電子研究所
Department of Electronics Engineering and Institute of Electronics
關鍵字: infrared photodetector;intersubband;quantum-well infrared photodetector;superlattice
公開日期: 1-Feb-2003
摘要: Photoelectron relaxation in the second miniband of a superlattice was studied with a high-pass energy filter at one end of the superlattice. By analyzing the spectral responses with different biases across the energy filter, the photoelectron distribution and relaxation in the second miniband of the superlattice can be resolved. In this paper, a model based on the rate equation is proposed to extract the related parameters of the photoelectron transport. The photoelectrons suffer from both intraminiband and interminiband relaxation. The extracted interminiband relaxation time is 11 ps, while the intraminiband one is in the sulipicosecond range. In addition, this structure can also be utilized as an infrared photodetector. Our analysis shows that the fast intraminiband relaxation is the dominant mechanism of the maximum achievable responsivity of the detector and the theoretical model not only provides the insight of the photoelectron transport in the superlattice miniband but also is useful for designing a superlattice infrared photodetector.
URI: http://dx.doi.org/10.1109/JQE.2002.807175
http://hdl.handle.net/11536/28141
ISSN: 0018-9197
DOI: 10.1109/JQE.2002.807175
期刊: IEEE JOURNAL OF QUANTUM ELECTRONICS
Volume: 39
Issue: 2
起始頁: 306
結束頁: 313
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