Electron collection and thermionic emission from a spherical dust grain in the space-charge limited regime

Femtosecond Thermionic Emission in the Space-Charge Limited Regime

Bistable intrinsic charge fluctuations of a dust grain subject to secondary electron emission in a plasma.

A master equation was formulated to study intrinsic charge fluctuations of a grain in a plasma as ions and primary electrons are attached to the grain through collisional collection, and secondary electrons are emitted from the grain. Two different plasmas with Maxwellian and non-Maxwellian distributions were considered. The fluctuations could be bistable in either plasma when the secondary ele...

A Novel Method Describing the Space Charge Limited Region in a Planar Diode

A novel and rather simple method is presented to describe the physics of space-charge region in a planar diode. The method deals with the issue in the time domain and as a consequence transient time behavior can be achieved. Potential distributions and currents obtained using this technique, supposing zero initial velocity for electrons, reveal absolute agreement with Child's results. Moreover,...

Space-charge-limited flows in the quantum regime

This paper reviews the recent developments of space-charge-limited SCL flow or Child-Langmuir CL law in the quantum regime. According to the classical CL law for planar diodes, the current density scales as 3 /2’s power of gap voltage and to the inverse squared power of gap spacing. When the electron de Broglie wavelength is comparable or larger than the gap spacing, the classical SCL current d...

THERMIONIC-FIELD EMISSION IN AIGaAs/GaAs 1WO-DIMENSIONAL ELECTRON GAS CHARGE-COUPLED DEVICES

Dark current in AIGaAs/GaAs two-dimensional electron gas charge-coupled devices (2DEG CCDs) is investigated both theoretically and experimentally. Measurement of the dark current for temperatures in the range 160 K to 360 K was performed and compared with the results of numerical modelling. It is found that thermionic-field emission of electrons from the gate to the channel is the dominant mech...