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- W2567366817 abstract "by forming D centers. By means of phonon induced_co~duc tivitymethod (PIC)[l] it has been shown that D centers are neutralized by one-phonon transitions from a bound state into the conduction band. There has been no study of the role played by the polarization of the phonons involved in the lmpurlty-bana transitions or in the pro cess of phonon neutralization of D centers. 2 EXPERIMENTAL RESULTS and DISCUSSIONS We are reportin~ a study of D-states in 51.: P crystals with Nd-N.=8·10' cm-3, N.=2·10'3 cm-3 by means of the he at pulse method and also of the PIC method, described in (2] with the help of a cooled pream~lifier [3]. The phonon conductivity signal is Aa=e~ ~ ND-. The tempera ture dependence of the PIC-signals AaCT) _is exponential with an activation energy El=1.75±O.05·10 3eV (Figl). It can be seen that at T(2K there is a deviation from this exponential behavior. When temperature is high, the con dition Na>~D- leads to El, at lower te~peratures Ei al ters by El/2, which corresponds to ND-~a. The result of greatest lnterest is the difference be tween the shape of PIC-signals (Fig2b,d) and that of the time-of-flight .spectrum of the phonons recorded with the help of the bolometer (Fig2a,c). Specifically, the ratio of phonon amplitudes FTA/LA in the two cases differed by more than an order of magnitude. The ratio FTA/LA of the PIC-signal does not depend on the temperature (Figlb). However, at the constant value of the p~onon flux, under conditions such that the density of D centers changes by two orders of magnitude as tne temperature is varled CFigla), the FTA/LA: would necessariIy change if this" @default.
- W2567366817 created "2017-01-06" @default.
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- W2567366817 date "1993-01-01" @default.
- W2567366817 modified "2023-09-27" @default.
- W2567366817 title "Impurity atoms in semiconductors at helium temperatures can capture an excess electron to an outer shell, there" @default.
- W2567366817 hasPublicationYear "1993" @default.
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