Publication: Lone-pair states as a key to understanding impact ionization in chalcogenide semiconductors

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Title	Lone-pair states as a key to understanding impact ionization in chalcogenide semiconductors
Authors/Editors*	O. Rubel and D. Laughton
Where published*	J. Phys.: Condens. Matter
How published*	Journal
Year*	2010
Volume	22
Number
Pages	355803
Publisher
Keywords
Link	http://www.tbrri.com/~orubel/publications/2010/J_Phys_Condens_Matter_v22_p355803_y2010.pdf
Abstract	Impact ionization of holes and domination of p-conductivity in chalcogenide semiconductors are attributed to a weak electronâphonon interaction inherent to lone-pair states. This argument is supported by first-principles calculations of an acoustical deformation potential in trigonal selenium. Results of the calculations reveal a strong dependence of the deformation potential on the excess energy of charge carriers. The latter is interpreted using a simple tight-binding model.