Investigation And Expanded Application Of Si/Conductive Polymer Hybrid Solar Cell

Recently,the Solar energy has attracted increasing attention from both industries and researchers,because of unsustainable and pollution problem of the traditional fossil-fuel sources.To obtain the highest power conversion efficiency(PCE)with the lowest cost is the chasing goal of solar cells.Mono-crystalline solar cell occupies a 49%share in the photovoltaic market,due to its high PCE.However,the fabrication of mono-crystalline solar cells needs some high energy cost processes,such as thermal diffusion,and ion implantation.By contrast,the hybrid solar cells(HSCs)made up of mono-crystalline solar cell and the organic conducting polymer have attracted a lot of attentions due to their potential to produce high-efficiency solar cells by a simple low cost process.In this work,a hybrid structure consisting of n-type crystalline Si with surface nanostructures and a poly(3,4-ethylenedioxythiophene):polystyrenesulfonate(PEDOT:PSS)hole transporting layer was investigated.The performance optimization and practical application of Si/PEDOT:PSS hybrid solar cell was investigated.After systematic investigation,we obtain the following results.Firstly,the Si/PEDOT:PSS hybrid solar cell was investigated systematically,a optimized PCE was obtained.The optimized gird electrode of PEDOT:PSS/Si solar cell is designed following the mechanism on power loss of solar cell for the first time.The effect of co-solvent on cell performance was investigated systemically.The low-cost metal-assisted etching was studied.With the analysis of reflectance spectra and J-V characteristics of the solar cell,the effect of the length of Si NW on cell performance was studied.The optimized performance would be obtained while the length of Si NW equal to 1um.The influence of the interface between Si NW/PEDOT:PSS on cell efficiency was investigated.With the passiviation of ultra thin film,a PCE of 12.4%was obtained for the Si NW/PEDOT:PSS hybrid solar cell.Secondly,the top electrode of Si NW/PEDOT:PSS hybrid solar cell was optimized by replacing the silver grid electrode with the random silver nanowire network.The short-circuit current was increased from 32.OmA/cm2 to 34.6mA/cm2.The fill factor was increased from the 54.3%to 56.7%,the PCE was increased from 9.4%to 10.4%,indicating the superiority of random silver nanowire network in increasing the light transmission and decreasing resistance.It was proved to be suitable for fabricating the high performance solar cell.Thirdly,a new self-charging power pack consisting of a SiNW/PEDOT:PSS solar cell and an LSG supercapacitor has been demonstrated.This device exhibited a superior capacitance characteristic when compared to other electrode materials used in integrated power pack systems.The overall efficiency of the power unit is 2.92%.The photo-induced energy conversion capability of the power pack under room light illustration has been demonstrated.Hence,this power pack could prove to be very useful for versatile,practical applications.In addition,a flexible mono-crystalline Si/PEDOT:PSS hybrid solar cell was obtained,the relationship between flexibility and the cell performance was investigated.An a-Si:H/PEDOT:PSS cell was fabricated,a PCE of 1.4%was obtained.In addition,two innovative and low-cost method to fabricate the flexible hybrid cell were proposed,some preliminary research progress has been made.Lastly,a Ge/PEDOT:PSS hybrid solar cell was fabricated,verifying its photoelectricity function.The contact problem between Ge/Al was investigated.With inserting an ultra thin amorphous layer between Ge/Al,the modulation of Schottky barrier height and an Ohmic contact were obtained.This investigation was a significant guidance for decreasing the power loss of hybrid solar cells.