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Temperature-dependent photoresponsivity and high-temperature operation of a quantum dot infrared photodetector
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View: Figures


Image of FIG. 1.
FIG. 1.

(Color online) Photocurrent spectrum of the QDIP measured at the QDIP temperature of and bias voltage of . The peak wavelength and the spectral width (FWHM) of photocurrent spectrum are 9.9 and , respectively. No obvious peak wavelength shift was observed when we changed bias levels or operating temperature.

Image of FIG. 2.
FIG. 2.

(Color online) Noise currents of the QDIP at 78, 100, 130, 150, and . The dashed is the calculated thermal noise current at . At , noise current increases from as the bias increases from . At , the noise currents were measured to be and at the biases of 0.25 and , respectively.

Image of FIG. 3.
FIG. 3.

(Color online) Temperature-dependent electron capture probability at biases and . A nearly linear relation between and is obtained. The corresponding activation energies for thermal reemission are calculated to be 77 and at the bias and , respectively.

Image of FIG. 4.
FIG. 4.

(Color online) Temperature-dependent photoresponsivity of the QDIP at the different bias voltages. At the same bias, the photoresponsivity is larger at higher QDIP temperature. A high of was obtained at QDIP temperature of and a low bias of .

Image of FIG. 5.
FIG. 5.

(Color online) Normalized photoresponsivities at 100, 130, 150, and . A near constant are obtained at different temperatures. This indicates that the strong temperature-dependent photoresponsivity effect is mainly due to the electron thermal reemission induced temperature-dependent photoconductive gain.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Temperature-dependent photoresponsivity and high-temperature (190K) operation of a quantum dot infrared photodetector