Normal and Anomalous Dember Effect
- 15 March 1969
- journal article
- research article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 40 (4), 1930-1933
- https://doi.org/10.1063/1.1657868
Abstract
Using Gärtner's equations, effect of sample thickness on the Cember potential (VD) for strong and weak absorption is discussed. It has been found that for strong absorption, as the thickness of the sample increases, VD tends to a saturation value which decreases as the front‐surface recombination velocity increases. For weak absorption, initially the behavior of VD depends upon front and back surface recombination velocities, but for large thickness it becomes independent of them and increases linearly with thickness. When front‐surface recombination velocity is large as compared to back surface recombination velocity, a sign reversal can take place. Expressions are obtained for VD(i) when surface recombination is dominant, or (ii) when bulk recombination is dominant, for weak and strong absorption in the case of thin and thick specimens. A physical explanation of anomalous Dember effect is given by considering the contribution of the concentration gradients set up by front, back, and bulk recombinations. It appears that simultaneous measurements of Hall angle and ratio of PME and Dember potential can be helpful in measuring electron‐hole mobility ratio.Keywords
This publication has 6 references indexed in Scilit:
- Concerning the Possibility of Observing Lifetime-Gradient and Dember Photovoltages in SemiconductorsJournal of Applied Physics, 1967
- Photovoltaic Effects in CdS CrystalsPhysical Review B, 1960
- Generation of an emf in Semiconductors with Nonequilibrium Current Carrier ConcentrationsReviews of Modern Physics, 1957
- Spectral Distribution of the Photomagnetoelectric Effect in Semiconductors: TheoryPhysical Review B, 1957
- Photoelectromagnetic and Photodiffusion Effects in GermaniumProceedings of the Physical Society. Section B, 1953
- Conduction in Poor Electronic ConductorsNature, 1933