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Theory of photoemission from molecular crystals
Author(s) -
Belkind A. I.,
Brodskii, V.V.Grechov A. M.
Publication year - 1978
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220850207
Subject(s) - photocurrent , polarization (electrochemistry) , photoconductivity , limiting , electron , condensed matter physics , electronic band structure , basis (linear algebra) , density of states , physics , atomic physics , chemistry , materials science , quantum mechanics , mathematics , mechanical engineering , engineering , geometry
Abstract On the basis of previous approach and considering non‐direct transitions an expression is obtained for calculating photoemission (PE) current from molecular crystals. The model used for treating optical transitions contains the concept f quasi‐particle (hole) formation simultaneously with generation of an electron. The band, corresponding to this quasi‐particle, has a width approximately equal to polarization energy. For the limiting case of high energies a relationship is obtained by means of which it is possible to find energy dependence of density of states in the hole band, using experimental results. The cubic law is deduced for the near‐threshold region using the above‐mentioned relationship based on the experiment. The general expression for photocurrent is also used to obtain the spectral dependences of photoconductivity in the threshold region.