Fabrication Of Anti-reflecting And Photovoltaic Materials On The Basis Of Self-assembled Colloidal Crystals

Optical anti-reflection, or in other words the loss of reflection, attract more and more attention and investigation for the potential application.In this paper, to explain the basic principles of anti-reflection, we introduce several anti-reflect phenomenon in nature. We illuminate single-layer coating, double-layer coating, multilayer coating and gradient refractive index coating theories. We particular give some way to fabricate anti-reflecting metrials. For we need to apply the anti-reflection to improve the performance of solar cells, we specially introduce the basic principle and development status. And the detailed job in this paper main contain these two aspect below.First, in the second part of this paper, we synthesize monic distributing polystyrene sphere in nano scale. Later we deposit the polystyrene sphere onto the surface of single crystal silicon periodically by self-assemble. We treat the polystyrene sphere as template and etch the surface of silicon by plasma instrument. To investigate the surface shape, we obtain the surface and section image by SEM. We also test the reflect property of RIE treated silicon. We find that with the increasing of etching time, the surface shape of silicon from round stage to column, and then to conical column. Contrast to the reflect spectrum of untried silicon, we found that the etched silicon can reduce the reflection significantly. Especially increase the etching time to 12min or longer, almost in entire visible light area, the reflection ratio will lower then 5%. Prove that the structure fabricated by RIE have excellent anti-reflect performance. We also fabricate large area nanoware (post) structure on the surface of silicon by wet etching way. To test the shape of nanoware (post) by SEM and obtain the reflect spectrum, we ensure that the structure was what we expected and the surface has brilliant anti-reflection performance.The third part of this paper mainly introduce a way to apply the anti-reflect technique to improve the performance of Photovoltaic Materials. We first establish an appropriate way to treat high conductivity single crystal silicon by RIE. Then we drop boron into structured silicon, and the P-N junction formed. After the step of plating electrode, a simple silicon solar cell formed. To test the electric performance, obtain the i-v curve, contrast to the apparatus fabricated by plat single crystal silicon, we confirm that the anti-reflection structure fabricated by RIE put up a palmary action to improve the capability of silicon Photovoltaic Materials.With the limit of technics, the absolute value of the Photovoltaic Materials'data not very excellent, only have a relative better value. And we expect to study a better route to amend the performance of Photovoltaic Materials.