High Injection Effects on Solar Cell Performances

Experiments are performed on solar cells under concentrated sunlight in order to explore fundamental physical processes with high injection conditions. Saturation effects are observed on the cell open circuit voltage and on the extracted values of the recombination current. A large decrease of the initial decay of the transient voltage have been measured. High injection effects are shown to be correlated with the increase of recombination current in the space charge region together with an increase of the emitterbase coupling

Simulation of Open Circuit Voltage Decay for Solar Cell Determination of the Base Minority Carrier Lifetime and the Back Surface Recombination Velocity

The Open Circuit Voltage Decay (OCVD) method for the determination of the base minority carrier lifetime (τ ) and the back surface recombination velocity (S) of silicon solar cells has been investigated at constant illumination level. The validity of the method has been discussed through a simulation study by considering the mathematical solution of the continuity equation. Extracted values of τ and S are compared to their input values in order to evaluate the performances of our method and the precision with regard to cell structural parameters, namely the base width and the base doping level. Deviations in lifetime values remain lower than 7% for almost all the cell configurations while recombination velocity deviations are shown to be dependent on cell structure parameters and experimental procedure

Advanced integrated solution for MEMS design

This paper presents a fully integrated solution for the development of Micro Electro Mechanical Systems which covers component libraries, design tools and designs methodologies which are used in conjunction with conventional design automation tools. This solution enables system houses in wireless and optical communications and consumers electronics markets to reduce their internal development costs and significantly accelerate their product development cycle