An Optimization Study Of Heteroiunction Interface And Micro-Structure Of Antireflection Surface For Si/PEDOT:PSS Solar Cell

Si/organic hybrid solar cells,owing to the low-cost simple preparation technique and excellent conversion efficiency,are advanced photovoltaic cell.As the main optimizing methods for Si/PEDOT:PSS heterojunction solar cell,the micro-structure and interface modification have become hot spots in solar cell research field,and play important roles for the optimization of photovoltaic cells.In this paper,MACE method,hydrothermal method,chemical corrosion method and other methods were applied as the main preparation techniques,and SEM,UV-vis,minority carrier lifetime test,solar cell test system were used to carry out the properties of different series of photovoltaic cells.These works are investigated the influences caused by the micro-structure and interface modification,as follows:(1)Under different etching conditions,investigated protective effects of different corrosion resistants for silicon wafer,and confirmed the 3M9495MP double-sided tape could effectively.(2)The porous silicon pyramid structure with good morphology and performance was prepared by a combining MACE with chemical etching method,and the influences of three factors including silver deposition time,etching time and AgNO3 concentration on the experiment were mainly studied.The results showed that at the concentration of AgNO3 of 2.5 mM,the 2 mins silver deposition time and 3 mins etching time,the prepared samples has the best morphology and performance.It also shows that the micro-structure is an important path for efficiency enhancing.(3)Three kinds of textualized structures with feature morphologies,namely silicon pyramid,nanowire and porous silicon pyramid,were prepared via chemical methods and applied various techniques to investigated their properties and conversion efficiencies.The PCE of silicon cells with different micro-structures was as follows:silicon pyramid(9.54%)>porous silicon pyramid(9.26%)>planar silicon(8.70%)>silicon nanowire(6.58%),which shows that the micro-structure importing enhances the PCE.Meanwhile,the PCE of porous silicon pyramid which has higher porosity,is lower than the silicon pyramid,which caused by its unperfect compounding with organic layers than pure pyramid structure.It also proves that the performance of solar cell devices is the result of the cooperation of micro-structures of Si based materials and compounding abilities with organic layers.(4)By comparison of the PCE of different organic materials on silicon py ramid substrate,it is shows that the PEDOT:PSS(9.54%)is better than P3HT(2.66%).Meanwhile,by introducing DEP and TAPC additives,the modification of composite interface can be realized,the results show that the introduced in terface layer can effectively improves the performance of the device via the m odified the minority carriers lifetime,VOC,JSC and PCE.The DEP/Ag/PEDO-T:PSS/TAPC/n-Si/PCBM/Al structure solar cells,has the minority carriers lifetime of 49.36 ?s and PCE of 10.51%,is the the best solar cell in three different structures cells.In addition,by introduced DEP into the porous silicon pyramid substrate,which effectively improved the combination of the porous silicon py ramid and the organic layer,the highest PCE in this reach subject was achieve d.Owing to the synergistic effects of microstructure and interface medication,t he PCE of porous silicon pyramid reached to 11.52%from 8.7%of the planar silicon.