| Solar light trapping structure design is an important part of the solar cell research, in which metal plasmon light trapping structure is an important means to enhance solar absorption. In this study, based on the metal surface plasmon, in combination with other light trapping structures, four kinds of light trapping structures were designed and optimized for a-Si solar cell, the main work includes:First, bonding a metal reflector and an antireflective layer, the first nano-dome solar cell structure was designed. The study optimized the width and height of roof structure were and carefully investigated the light absorption enhancement mechanism, the optimal structure of the short circuit current was obtained, as21.9016mA/cm2.Second, combining a metal grating with an antireflective layer, the second nano-dome solar cell structure was designed. We mainly researched the width, height and period of the metal grating.the active layer thickness of optimal structure was only26nm, while the average absorption was as large as71.3%. We also studied the influence of asymmetry and incident angle to the solar cell absorption.Thirdly, we analyzed influence of the material, shape and size of the metal internal electrode in nanowire array solar cells to the short circuit current and found the optimal structure had a short-circuit current up to26.2833mA/cm2,when the metal electrode was silver triangle and the half-height and half-width were70nm.Fourthly, we design a wind-wheel shaped solar cell composed by seven isosceles triangle blades and a metal core. We firstly optimized the corner of blades and found that the average absorption is as large as89.12%when the corner is29°. Based on this optimal structure, we optimized the cylindrical metal electrode and found the absorption is largest when the radius is20nm. |
