Temperature dependence of carrier dynamics for quantum dot infrared photodetectors
AFM image of 2.4 ML QD deposition.
-PL spectra of QDIPs, normalized to their ground-state emission peaks, taken at at different excitation power densities: (continuous), (dotted line), (dashed line), and (dash dotted line). The inset shows the emission spectrum from WL.
Variation of PL spectra at different temperatures. The excitation power density is about . The spectra are vertically offset for clarity.
45° -incidence detection for QDIPs at different temperatures ranges: (a) 30–90 K and (b) 100–200 K. The weak spectrum at 100 K was plotted with the much stronger spectra at above 110 K in (b) for emphasizing the sudden increase in intensity. Also, the spectra are vertically offset for clarity.
Comparison of normalized intensity of responsivity and PL spectra at 180 K.
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