Photoconductivity of the nickel dihalides and the nature of the energy gap
- 15 March 1987
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 35 (8) , 4038-4043
- https://doi.org/10.1103/physrevb.35.4038
Abstract
Measurements of the photoconductivity of single crystals of the nickel dihalides Ni (X=Cl, Br, I) are reported. The photoconductivity energy gaps at 100 K are 4.7 eV (), 3.5 eV (), and 1.8 eV (). It is shown that the energy gap in these materials is due to charge-transfer transitions from the anion p band to transition-metal d states. The photoconduction is due to holes in the anion p band.
Keywords
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