The use of electro-deoxidation in molten salts to reduce the energy consumption of solar grade silicon and increase the output of PV solar cells  

作　　者：Paul R.Coxon Michael Coto Eimutis Juzeliunas Derek J.Fray 

机构地区：[1]Department of Materials Science&Metallurgy,University of Cambridge [2]Institute of Chemistry,Centre for Physical Sciences&Technology [3]Klaipeda University

出　　处：《Progress in Natural Science:Materials International》2015年第6期583-590,共8页自然科学进展·国际材料（英文版）

基　　金：support from Tavarua International Ltd grant number RG-67575

摘　　要：Solar photovoltaics,based upon silicon,are the most popular form of solar cell with efficiencies around 20%.These efficiencies can be further increased by employing light trapping schemes to minimise optical losses through scattering and reflection which enhances the amount of light absorbed and number of photo-carriers generated.Typical approaches employ antireflection coatings(ARCs) or texturise the surface of the silicon disks,so that the structure consists of an array of needles which can absorb most of the light.Usually,these structures are created by leaching the silicon with hydrofluoric-based acids or by reactive ion etching(RIE) methods.This paper reviews some of the methods for improving the energy efficiency of silicon production,and describes the use of electro-deoxidation of SiO_2 layers,on silicon,in molten calcium chloride to form nanoporous black silicon(b-Si) structures.By coating b-Si surface with TiO_2,a common ARC,extremely black surfaces with negligible reflectance of about 0.1%,are produced,which can have applications for low-cost high efficiency solar cells.Solar photovoltaics, based upon silicon, are the most popular form of solar cell with efficiencies around 20%. These efficiencies can be further increased by employing light trapping schemes to minimise optical losses through scattering and reflection which enhances the amount of light absorbed and number of photo-carriers generated. Typical approaches employ antireflection coatings (ARCs) or texturise the surface of the silicon disks, so that the structure consists of an array of needles which can absorb most of the light. Usually, these structures are created by leaching the silicon with hydrofluoric-based acids or by reactive ion etching (RIE) methods. This paper reviews some of the methods for improving the energy efficiency of silicon production, and describes the use of electro-deoxidation of SiO2 layers, on silicon, in molten calcium chloride to form nano porous black silicon (b-Si) structures. By coating b-Si surface with TiO2, a common ARC, extremely black surfaces with negligible reflectance of about 0.1%, are produced, which can have applications for low-cost high efficiency solar cells. Crown Copyright (C) 2015 Production and hosting by Elsevier B.V. on behalf of Chinese Materials Research Society.

关 键 词：Black silicon Solar cell photovoltaics Silicon molten salt ELECTROCHEMISTRY 

分 类 号：TM914.4[电气工程—电力电子与电力传动]