A Superlattice Infrared Photodetector Integrated With Multiple Quantum Wells to Improve the Performance

Lu, Jinsheng; Wu, Kun-Jheng; Hsieh, Kuang-Jou; Kuan, Chieh-Hsiung; Feng, J. Y.; Lay, T. S.; Yang, Chenwei; Tu, S. L.

doi:10.1109/jqe.2006.884584

Cited by 10 publications

(2 citation statements)

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“…The maximum detectivity value of detector 2 is 1.2 Â 10 10 cm Hz 1/2 /W, which is higher than all of our previous works. 9,[18][19][20] Therefore, all the above analysis indicates that the thick barrier is helpful to enhance the photoresponse, especially under very low bias. The double-barrier design of detector 2 can enhance the tunneling probability of the photocurrent and dark current is not enhanced.…”

Section: Detector Performancementioning

confidence: 91%

“…The dark electrons usually stay in the first miniband and then tunnel through the thin barrier until the assistant of thermal phonons. 18,19 Therefore, the dark electrons cannot resonate to enhance dark current but photoelectons can resonate in the bottom of the second miniband to enhance the photocurrent. The operation temperature of the detector can be significantly increased and this phenomenon is consistent with our design.…”

Section: Detector Performancementioning

confidence: 99%

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Device Performance and Photoelectron Resonance in Double-Barrier Superlattice Infrared Photodetectors

Lin

Feng

et al. 2011

J. Electrochem. Soc.

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A double-barrier superlattice infrared photodetector (SLIP) that contains a superlattice sandwiched by the thin and thick barriers has been developed. Photoelectrons can bounce back and forth between the two barriers and inject through the thin barrier to enhance the photocurrent. In comparison with the single-barrier SLIP, this structure shows at least one-order higher magnitude of photocurrent at low bias and the associated 80 K detectivity is also increased for more than one order. This detector also shows high-temperature operation above 100 K with an appropriate detectivity at low bias (1.1 × 109 cm Hz1/2/W at 0.17 V). A simple photoelectron resonance model is given to analyze the resonance phenomenon. It is found that photoelectrons excited by 9.2 µm wavelength can resonate in the bottom of the second miniband by 42 to 49 times from 0.05 to 0.15 V to enhance the photocurrent dramatically.

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Section: Detector Performancementioning

confidence: 91%

Section: Detector Performancementioning

confidence: 99%