Investigation of broad-band quantum-well infrared photodetectors for 8-14-μm detection

Chu, J.; Li, S.S.; Singh, Anjali

doi:10.1109/3.748836

Cited by 11 publications

(7 citation statements)

References 17 publications

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“…[4][5][6] For the IQE device, the responsivity line shape and bandwidth are very similar to those of the calculated absorption spectra for the lower N d of 3 ϫ 10 17 cm −3 . The IQE sample is, therefore, consistent with a structure that has a lower N d and an energy independent escape probability as discussed earlier.…”

Section: Form Approved Omb No 0704-0188supporting

confidence: 50%

“…3 Another approach to obtain broadband detection involves MQW structures where each unit consists of several QWs with different well widths and/or well compositions. [4][5][6] Although these structures have ⌬ ϳ 4.5-6 m, large bias voltages are required for obtaining broad response because only the shorter wavelength QWs are turned on at low voltages. Furthermore, since different QWs have different activation energies, their impedance ratio changes with temperature.…”

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confidence: 99%

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Binary superlattice quantum-well infrared photodetectors for long-wavelength broadband detection

Ellis

Majumdar

Choi

et al. 2004

Applied Physics Letters

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We have adopted a binary superlattice structure for long-wavelength broadband detection. In this superlattice, the basis contains two unequal wells, with which more energy states are created for broadband absorption. At the same time, responsivity is more uniform within the detection band because of mixing of wave functions from the two wells. This uniform line shape is particularly suitable for spectroscopy applications. The detector is designed to cover the entire 8 -14 m long-wavelength atmospheric window. The observed spectral widths are 5.2 and 5.6 m for two nominally identical wafers. The photoresponse spectra from both wafers are nearly unchanged over a wide range of operating bias and temperature. The background-limited temperature is 50 K at 2 V bias for F / 1. The past decade has seen increased research activity in the area of broadband quantum-well infrared photodetectors (QWIPs) for spectroscopy in the 8 -14 m atmospheric transmission window.1-6 Development of on-chip infrared spectrometers requires broadband detector material where wavelength-selective pixels are created using structures such as quantum-grid infrared photodetectors or enhanced QWIPs. 7,8 Initial broadband QWIP designs utilized boundto-continuum transitions in multiple QW (MQW) and superlattice (SL) structures.1,2 These detectors had spectral bandwidths ⌬ of ϳ3 m (defined as the full-width at halfmaxima) and peak wavelengths p in the 5 -10 m range. Multistack detectors have also been investigated for broadband as well as voltage tunable multicolor detection.3 Another approach to obtain broadband detection involves MQW structures where each unit consists of several QWs with different well widths and/or well compositions.4-6 Although these structures have ⌬ ϳ 4.5-6 m, large bias voltages are required for obtaining broad response because only the shorter wavelength QWs are turned on at low voltages. Furthermore, since different QWs have different activation energies, their impedance ratio changes with temperature. The resulting change in potential drop leads to different spectral line shapes at different temperatures. In this letter, we present the design and fabrication of long-wavelength broadband QWIPs that employ miniband-to-miniband transitions in binary SL (BSL) structures. These QWIPs have ⌬ ϳ 5-6 m with p ϳ 10 m and exhibit minor changes in bandwidth with bias voltage and temperature.Superlattice detectors were first introduced by Kastalsky et al. 9 Since then, the SL design has been used for both mid-wavelength 10 and long-wavelength 2,11,12 detection. Although these SL detectors have ⌬ ϳ 2-3 m, the responsivity spectra are sharply peaked near their cutoff wavelengths.2,10-12 To further increase the bandwidth and improve the uniformity of the responsivity spectra, we adopted a BSL design. In this structure, the basis of the SL consists of two different wells separated by thin barriers. Upon infrared absorption, electrons from each of the two ground minibands that originate from the two QWs are photoexcited to the two upper mini...

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Section: Form Approved Omb No 0704-0188supporting

confidence: 50%

mentioning

confidence: 99%

Binary superlattice quantum-well infrared photodetectors for long-wavelength broadband detection

Ellis

Majumdar

Choi

et al. 2004

Applied Physics Letters

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“…A large number of QWIP structures have, to date, been investigated. These include large inter-subband absorption due to bound-to-bound transition [1], inter-subband absorption due to bound-to-continuum transition [3], voltage tunable multicolor QWIPs [4], broadband QWIPs [5].…”

Section: Introductionmentioning

confidence: 99%

A new approach to quantum well infrared photodetectors: Staircase-like quantum well and barriers

Eker

Hoştut

Ergün

et al. 2006

Infrared Physics & Technology

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“…A large number of sophisticated QWIP structures have, to date, been investigated. These include large area focal plane arrays [2] multicolor [3,4] and broadband detectors [5]. Based on inter-subband transitions, they have been used for detection in the 3-5 lm mid-wavelength infrared (MWIP) and 8-14 lm long-wavelength infrared (LWIP) atmospheric spectral windows [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Broadband staircase quantum well infrared photodetector with low dark current

Ergün

Hoştut

Eker

et al. 2006

Infrared Physics & Technology

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Investigation of broad-band quantum-well infrared photodetectors for 8-14-μm detection

Cited by 11 publications

References 17 publications

Binary superlattice quantum-well infrared photodetectors for long-wavelength broadband detection

Binary superlattice quantum-well infrared photodetectors for long-wavelength broadband detection

A new approach to quantum well infrared photodetectors: Staircase-like quantum well and barriers

Broadband staircase quantum well infrared photodetector with low dark current

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