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(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.
(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.
(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.
(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 .
(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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