| The shortage of Energy is seriously today,one of the effective way to solve the problem is photovoltaic power generation.At the present,the crystalline silicon solar cells which have stable performance and high efficiency are the main photovoltaic device in the market.However,the production of crystalline silicon solar cells involves complex technology,such as high temperature diffusion and plasma injection,which consumes overmuch energy.The new-style silicon/organic hybrid solar cell has the excellent photoelectric performance of silicon semiconductor materials and it also has the characteristics of flexible machined cell and low cost.It becomes a research hotspot that attracts people’s attention in the future.Silicon nanowires（SINWs）have high light trapping performance and conductive organic matter called poly（3,4-ethylenedioxythiophene）:poly（styrenesulfonate）（PEDOT:PSS）has high electrical conductivity and transmittance.Combining the advantages of the two materials,we would obtain high efficiency silicon/organic hybrid solar cells.So we made the SINWs/organic hybrid solar cells by combining SINWs array with the conductive organic PEDOT:PSS in the experiment.We optimized the performance of the device from several aspects,such as the production conditions of SINWs,organic solvent doping of PEDOT:PSS film,annealing temperature treatment,spin-coating times treatment,and tetramethylammonium hydroxide（TMAH）solution to improve the interface contact.The specific research contents are as follows:（1）We made the structured SINWs arrays by metal-assisted chemical etching.And we controlled the experimental parameters during the reaction process such as H2O2concentration,HF concentration,Ag NO3 concentration,etching time,etching temperature,etc.We studied the influence of experimental parameters on the surface morphology of nanowires and finally found the best experimental parameter when the nanowires had relatively regular morphology and low reflectance.（2）We produced the PEDOT:PSS film on the quartz substrate by spin coating and doped different kinds of organic solvents in it.Then we selected the optimal organic solvent which based on film morphology and transmittance（DMSO）.On the basis of it,we studied the influence of different annealing temperatures and spin coating times on the transmittance of PEDOT:PSS films.Moreover we analyzed the influence of DMSO doping content on the PEDOT:PSS film conductivity.The mechanism of the change in the conductivity was analyzed by UV spectrophotometer and atomic force microscope.The result was that the doped DMSO did not react with PEDOT:PSS（benzoquinone transition）.The doped DMSO leaded to the phase separation of PEDOT and left excess PSS in the PEDOT:PSS,increased the average grain size,reduced insulation barrier between the grains,improved the conductivity.（3）We immersed the SINWs arrays in the TMAH solution to make the gaps between the nanowires larger and the SINWs arrays sparser.So it is easier for the PEDOT:PSS solution to penetrate into the SINWs arrays to form excellent heterojunction.At the same time,the reflectance of SINWs arrays that spin-coated with PEDOT:PSS was slightly lower than SINWs arrays that were not spin-coated.The series resistance between the interfaces became smaller,and the open circuit voltage and fill factor of the device increased significantly after immersing in the TMAH solution.By the treatment of TMAH solution,both the surface defect state and specific surface area are reduced,therefore it reduced the surface charge recombination speed,prolonged the minority carrier lifetime,retained good antireflection performance,and improved the device performance. |
