Journal
JOURNAL OF SEMICONDUCTORS
Volume 38, Issue 5, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1674-4926/38/5/054006
Keywords
quantum well infrared photodetector; rolled-up microtube; strain; Stark effect
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Funding
- Natural Science Foundation of China [51322201, 61575213]
- Shanghai Municipal Science and Technology Commission [14JC1400200]
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Pre-strained nanomembranes with four embedded quantum wells (QWs) are rolled up into three-dimensional (3D) tubular QW infrared photodetectors (QWIPs), which are based on the QW intersubband transition (ISBT). A redshift of similar to 0.42 meV in photocurrent response spectra is observed and attributed to two strain contributions due to the rolling of the pre-strained nanomembranes. One is the overall strain that mainly leads to a redshift of similar to 0.5 meV, and the other is the strain gradient which results in a very tiny variation. The blue shift of the photocurrent response spectra with the external bias are also observed as quantum-confined Stark effect (QCSE) in the ISBT.
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