Photoelectric Effects In Semiconductors / Fotolektricheskie Yavlena V Poluprovo [Paperback]

Investigations of photoelectric effects occupy an important place in studies of semiconductors. Recently investigations of photoconductivity and photoelectromotive forces have been intensified in step with the general development of semi? conductor physics. An important feature of current work is an approach which combines several experimental methods of investigating photoconductivity by meas? uring a number of the parameters which govern it (e. g., quantum yield, lifetime, etc.). In other words the study of steady-state photoconductiv? ity is being replaced by the study of photoconductivity kinetics. Another important feature is the extension of the studies beyond pure? ly photoelectric phenomena by the use of radiations other than light. Such an extension is justified not only by practical requirements but also by the close similarity between the ionization processes produced by different radiations. It can be shown that the charge carriers liberated by light and other radiations are not unique as far as their behavior in a crystal lattice is concerned. This can be seen from the following considerations.I Phenomenological Description of Photoconductivity.- ?1. Equilibrium and Nonequilibrium Carriers; Nonequilibrium Conductivity.- ?2. Some Characteristics of Equilibrium Conductivity.- ?3. Energy Distribution of Nonequilibrium Carriers.- ?4. Lifetime of Nonequilibrium Carriers.- ?5. Relaxation of Nonequilibrium Conductivity.- A. Linear Recombination.- B. Quadratic Recombination.- C. Instantaneous Value of the Lifetime.- ?6. Photoconductivity of Finite Samples.- II Methods of Measuring Steady-State Photoconductivity.- ?7. Methods Using Continuous and Modulated Illumination.- ?8. Calculation of Photoconductance from Experimental Data.- A. Constant-Field Regime.- B. Constant-Current Regime.- C. Maximum-Sensitivity Regime.- D. Case of Weak Relative Photoconductance.- ?9. Sensitivity Threshold.- ?10. Optimum Sample Dimensions for Photoconductance Measurement.- ?11. ElimlóÎ