Photocurrent, Space-Charge Build-Up and Field Emission in Alkali Halide Crystals

Item

Title
Photocurrent, Space-Charge Build-Up and Field Emission in Alkali Halide Crystals
Date
1953
Index Abstract
Not Available
Photo Quality
Undetermined
Creator
Von Hippel, A.
Gross, E. P.
Jelatis, J. G.
Geller, M.
Corporate Author
Massachusetts Institute of Technology
Corporate Report Number
LIR TR 59
Extent
42
PB Number
PB108953
Identifier
AD0006049
Access Rights
Unknown
Distribution Classification
1
DTIC Record Exists
Yes
Distribution Change Authority Correspondence
None
Distribution Conflict
No
Abstract
Research is discussed on the formation of space charges, the re lease of electrons from the cathode, and their transconductance through a dielectric. The considerations are based on additively colored alkali halide crystals which represent a transparent solid with frozen-in-electrons that can be mobilized by light absorption. When these electrons move toward the anode, they leave a positive space charge; an adjustable cathode fall results which can be steepened until electrons are released by field emission. The steady-state and transient solutions for the charging and discharging cycle were calculated. The effects of light intensity, wave length, and field emission are discussed. KBr crystals were investigated experimentally as a function of time, voltage, light intensity, and color-center density. Field emission was produced with voltages as low as 1 v, and a field-emission photocell was realized.
Report Availability
Not available via Contrails
Date Issued
1953-02
Index In
PB/AD Index
Type
report