Study Of The Design And Fabrication Of Heterojunction Hybrid Solar Cell Based On Crystalline Silicon And PEDOT:PSS

Solar cell devices have proven to be one of the promising energy resources in the future,due to the reason that,solar energy is available all over the world and is an infinite renewable source of energy unlike other finite resources i.e.fossil fuels.The fabrication cost of the solar cell devices,are much less than that of other energy generators/sources.Because the sun energy is free of charge and easily available for harvesting.Furthermore,the materials that are used in the fabrication of solar cells are mainly the most lavish elements on the earth such as silicon.The most important thing is that solar energy does not have any bad impact on the natural environment.In addition,any climate changes do not affect the performance or energy release and delivered to the earth surface by the sun.In fact,it helps in eradicating the concern of contamination production,which are directly caused by fossil fuel consumption.While studying the benefits of photovoltaic devices,we were inspired to do some momentous work to enhance the performance of solar cells.Consequently,seeking for the best solar cell configurations(Planar-Si and Random-Pyramid-Si)from the literatures and modeling the optoelectrical characteristics of them was the first step taken in this area,second by performing experiments for fabrication of the Planar-Si/PEDOT:PSS and RP-Si/PEDOT:PSS hybrid heterojunction solar cells.We studied the electrical and optical properties of the heterojunction hybrid solar cells along with analyzing the experimental results for investigating the optimized parameters of the device for having a higher efficiency and cost-effective fabrication process for solar cell.In this study,we have demonstrated the fabrication process of the planar solar cell.We investigate that how the surface passivation can improve charge separation,transportation and reduce recombination eventually resulting in improved short circuit current,open circuit voltage,the fill factor FF and power conversion efficiency(PCE%)in the planar-Si/PEDOT:PSS heterojunction solar cell structure.Note that,the same results have been obtained in the RP-Si/PEDOT:PSS structure.However,using the RP structure as it enhances the light trapping and increase the length of the incident light inside the device.Vowing to this the short circuit current,open circuit voltage,FF and PCE show much more improvement,while series resistance was reduced as well as surface recombination with the help of surface passivation(Native oxide,SiOx).Furthermore,it is demonstrated that for RP-Si/PEDOT:PSS devices the wet etching has a great significance in choosing the etchant material as well as the concentration of the materials.We verified experimentally that the size,periodicity,uniformity and surface morphology can affect the performance of the solar cell device.To prove best result of etching employing alkaline solutions we carried out number of experiments to investigate the best etchant and concentration for RP-Si/PEDOT:PSS solar cell device.Finally,PEDOT:PSS polymer has proved to be a good candidate as the p-type material in a heterojunction solar cell device.While it can create a high-quality heterojunction with silicon in the form of RP-Si surface.Hence,this study qualifies the correlation of silicon surface passivation,uniformity,periodicity surface morphology and light management techniques to enhance photocurrent conversion and performance of the solar cell device.