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