Physics of Internal Photoemission and Its Infrared Applications in the Low-Energy Limit

Figure 3

(a) Quantum yield (); (b) first and (c) second derivatives of quantum yield spectra for samples A (6 V, 80 K), D (−0.5 V, 80 K), and E (0.05 V, 50). The structure of sample E is the same as A, except for its emitter doping concentration (). The vertical lines correspond to features listed in Table 1. Also shown in (c) (at the bottom) is bolometer (background) spectra. (d) Calculated value of based on a model [6]. The Van Hove singularities (VHS) of intervalence band transitions are indicated.