In order to improve the forward conduction characteristics of silicon semiconductor devices, a comprehensive study of the influences of boron diffusion, phosphorous diffusion, doping concentration distribution in P~+-P region of sintered Al-Mo electrode and the minority carrier life on the forward conduction characteristics is performed.

Measurement of doping concentration in strained Si_(1-x) Ge_x with four-probe array;

The electroluminescence spectra of devices with different doping concentration are detected under different driving current densities.

Based on rate equations,changing doping concentration and cladding size of the Er3+/Yb3+ co-doped double-cladding fiber laser,the effect of the doping concentration and cladding sizeon the performance of the Er3+/Yb3+ co-doped double-cladding fiber laser was studied.

53 μm photoluminescence intensity,doped concentration,and pump power were numerically simulated for Yb-Er co-doped .

By taking account of the loss of cavity as a function of the Nd 3+ doped concentration, a new expressions of the laser output power and the slope efficiency as a function of the doped concentration are obtained, which are coincident with the experimental results quite well.

% doped concentration,and a output coupler with radius of 30mm,were chosen in this experiment,and 456nm laser threshold was realized at 0.

By using MATLAB software, the authors carry out simulation computation and optimization; and study in a deep-going way the effect of the change of doping density and external bias voltage on frequency and amplitude of self-sustained oscillation of doped GaAs/AlAs superlattice with weak coupling.

The research results indicate that with the increase of doping density in channel,the hot carrier effect immunity becomes better.

The method to deal with doping density for t he simulation of semiconductor devices was discussed.

Influence of dopant concentration on properties of Al-F co-doped ZnO thin films;

The effect of oxygen content of the Nd-Fe-B permanent magnets doping Dy2O3 on the magnetic properties,the relation between the oxygen content of the magnets and the dopant concentration and ball abradant time have been studied by Mossbauer effect and magnetic measurement.

8-hydroxyquinoline aluminum(Alq3)was used as a host material, while tetraphenylporphyrin (TPP) as the dopant material, we constructed five electroluminescent (EL) devices with different dopant concentration, and studied the influence that the dopant concentration imposed on the EL devices’ electroluminescence spectra, color, max-brightness and max-efficiency.