Research On The Light Trapping Design And Device Performance Of Silicon-based Hybrid Solar Cells

As one of the most significant application of solar energy,photovoltaic solar cells are great guarantee for utility of solar resource effectively and cleanly.The traditional silicon solar cells are high-cost and with complex fabrication process,meanwhile fragile during bending,which limit its further development and application.The novel silicon organic-inorganic hybrid solar cells have the advantages of low cost and simple process.However the efficiency of hybrid solar cells are constrained by poor light absorption of silicon substrate surface.The surface texture technique is often used as light trapping structure in silicon-based solar cells.In addition,metal nanoparticles are widely applied for light absorption in mesoporous and thin film solar cells due to their unique surface plasmon effect.In this paper,targeting the problem of poor light trapping ability of silicon-based hybrid solar cells,the main research work is as follows:As hole transport material,the P type organic conductive polymer PEDOT:PSS often combines with N type monocrystalline silicon substrate to fabricate planar Si/PEDOT:PSS hybrid solar cells.Then we take advantage of the surface plasmon effect of the gold nanoparticles for light trapping and efficiency improvement of hybrid solar cells.Firstly the hydrothermal chemical reduction method was introduced to fabricate gold nanoparticles with different size and surface morphology and we analyze its light absorption performance.The result is that there is a strong absorption peak at 520 nm wavelength,which is considered to have potential possibility for light absorption enhancement in hybrid solar cells.We insert the gold nanoparticles into contact surface between the silicon substrate and PEDOT:the PSS layer and improve the contact property by adjusting the spinning coating rotation and annealing condition to optimize the surface plasmon effect.The efficiency of hybrid solar cells adopted gold nanoparticles were 11.84%,which is 14.2%higher compared with that of non-adopted gold nanoparticles.Using metal assisted chemical etching process to fabricate SiNWs with effective light trapping on silicon substrate.Meanwhile,we fabricated the SiNWs/PEDOT:PSS hybrid solar cells to explore the optimization of the efficiency caused by high-efficient light absorption of SiNWs.The external pressure process is conducted to improve the wettability of PEDOT:PSS inside the SiNWs to optimize the quality of hybrid heterojunction interface contact.Moreover,the high temperature pure oxygen oxidation modification process of SiNWs is introduced to fabricate a partial oxidized SiNWs for light trapping improvement and explore its application in the novel type of hybrid solar cells based on selective etching structure.Finally,we compared two light trapping methods based on the surface plasmon effect of the gold nanoparticles and the high-efficient light absorption of SiNWs and explore the optimization of the light trapping structure for hybrid solar cells.