Research On Photoelectric Characteristic Of Solar Cell Composite Of Smooth Crystalline Silicon-light Trapping Film

The solar cell is a semiconductor material device work of Photovoltaic Effect. The energy of sunlight can be directly converted into electrical energy. In recent years, with the support of positive policy in various of countries, the photovoltaic industry development fast. Crystalline silicon cells have occupied the mainstream position in photovoltaic market with advantages of low-cost. series of related research is conducted around the absorbance and photoelectric conversion efficiency of crystal silicon.smooth surface crystalline silicon is get with the chemical polishing processing,to remove the damage on the surface of the crystal silicon layer. Made battery with smooth crystal wafers, which has better Photovoltaic Effect, but with a high loss of light on the surface of smooth crystal cell about 30%.Crystalline silicon surface texturing although will reduce the reflection of sunlight loss, but also can cause the surface damage, especially large textured structure leads to increases adverse factors highlighted,such as the crystalline silicon cells high temperature diffusion inconsistent, lattice dislocation defects and the contact resistance increases, thereby limiting the photoelectric conversion efficiency of crystalline silicon cells further improved.To solve this problem,we presents a method to reduce the reflection of sunlight loss and to obtain high efficiency Photovoltaic Effect, namely, the smooth crystalline silicon-light trapping film composite.In this project,we will focus on the following work:1) A lot kinds of methods for texturing surface of crystal silicon and structure on surface of crystalline silicon are analyzed, to research the effect of micro-structure on the crystalline silicon solar cell to the optical properties and Photovoltaic Effect. Smooth surface crystalline silicon solar cell and textured surface crystalline silicon solar cells are made to observation the different size of micro-structure surface, absorption and conversion efficiency are tested. Apart from the effect of light absorption rate, the influence of different surface morphology of crystalline silicon solar cell Potovoltaic Effect is analyzed, obtained that the smooth crystal silicon cells have the best photovoltaic effect.2) light trapping principle of structure on the surface of crystalline silicon solar is analyzed, the surface morphology and structure of light trapping film is designed by the light trapping principle, and structural parameters are confirmed by theoretical calculation and software simulation and Optimization. According to the refractive index of crystal silicon and multilayer antireflection principle, the material and the processing technology of light trapping film are confirmed, the processing technology, a light trapping film is made to test the light trapping effect.3) Laminated composite technology and adhesive compound technology are researched, Considering the material of light trapping film and the structure of crystalline silicon cells, the structure of smooth crystalline silicon-light trapping film composite cell is optimized, to construct a high efficiency composite cell model. A smooth crystalline silicon-light trapping film composite cell is made to analysis the optical properties and electrical properties of composite cell.With the research above, the smooth surface crystalline silicon solar cells and the production process are determined, and the low loss reflection light trapping film is designed. Composite the light trapping film to smooth surface crystal silicon cell, the absorption of smooth surface crystal silicon cell is improved and a high conversion efficiency composite cell is obtained. With the conversion efficiency of 18.1%, the conversion efficiency of composite battery increase 1.6% compared with the common crystal silicon made of same material.