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We demonstrate a quantum ratchet detector, which is a high-resistance photovoltaic mid-infrared detector based on an engineered spatial arrangement of subbands. In photovoltaic quantum-well photodetectors, in which unidirectional photocurrent is generated by asymmetric quantum-well structures, maximization of device resistance by suppressing undesired electron transports is crucial for minimizing noise. A semi-quantitative guideline suggests the significance of spatial separation between wavefunctions for reducing the conductance from the ground state. Here, we employ a step quantum well made of a shallow floor and a deep well. Photoexcited electrons are quickly transferred to a separated location from the ground state through fast resonant tunneling and phonon scattering, and then they are allowed to flow in only one direction. This architecture is made possible by the use of a GaAs/AlGaAs material system, and it achieves a resistance as high as 6.0×104 Ωcm2 with a single-period structure. Combined with optical patch antennas for responsivity enhancement, we demonstrate a maximum background-limited specific detectivity of 6.8×1010 cmHz1/2/W at 6.4 μm, 77 K for normal incidence, and a background-limited-infrared-photodetector temperature of 98 K.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

  VC 2024 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (https://
  creativecommons.org/licenses/by/4.0/). https://doi.org/10.1063/5.0208399

キーワード: Photodetectors, Quantum wells, Optical antennas, Infrared

刊行年月日: 2024-06-03

出版者: AIP Publishing

掲載誌:

• Applied Physics Letters (ISSN: 00036951) vol. 124 issue. 23

研究助成金:

• Japan Society for the Promotion of Science JP22K18990
• Japan Society for the Promotion of Science JP23H01883
• Japan Society for the Promotion of Science JP24K01367

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1063/5.0208399

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更新時刻: 2024-06-11 12:30:23 +0900

MDRでの公開時刻: 2024-06-11 12:30:24 +0900