Multi-trench-based technique to improve amorphous SiGe thin-film solar cell performance
In order to improve the electrical performance of the conventional amorphous SiGe thin-film solar cells, a new multi-trench technique has been proposed. In this method, the multi-trench is created in the intrinsic SiGe layer and filled with p-type doped Si. The p-type trenches in the intrinsic SiGe layer improve the electrical performance of the proposed design. Electrical characteristics of the proposed structure are analyzed and optimized by 2-D numerical modeling and compared with conventional amorphous SiGe thin-film solar cell characteristics. The extracted results show that the multi-trench-based technique has excellent effect on the fill factor and efficiency of the device.
Equivalent circuit modeling of SiGe/Si solar cell including interfacial defect effects
In this paper the numerical investigation of the Sil-xGex/Si heterostructure solar cell is proposed. The proposed investigation is based on the study of the immunity of the Sil-xGex/Si heterostructure against the defects degradation effect at nanoscale level (thin films). The numerical analysis takes into consideration the impact of the interface defects on the solar cell behavior. In addition, a new equivalent electrical circuit of the solar cell before and after the setting up of defect degradation effects is developed in this study. The developed equivalent circuit can be implemented into solar cell simulator like: SPICE and PCID, in order to study the impact of the interface defects on the photovoltaic systems. The proposed investigation is intended to be an aid to solar cell designers.
Experimental Study on Acoustic Agglomeration of Fine Particles from Coal Combustion
The removal of fine particles in coal-fired fumes was experimentally studied based on acoustic agglomeration. An experiment facility was designed and set up. In this facility, a fluidized bed coal combustor was used as fume generator, and an Electrical Low Pressure Impact or (ELPI) was used to measure the fine particle concentration and size distribution in the fumes. The results show that under the effect of high intensity sound waves, there is good performance to remove fine particles in coal-fired fumes, which with a number mean diameter of 0.07μm. Especially, under the conditions of the frequency of 1 000Hz and the sound intensity of 161.5dB, the number concentration of 0.0233~9.314μm particles decreased by 85.2%, and their mass concentration decreased by 92.5%.