Utilizing Surface Hierarchical Antireflection Structure on Industrial-scale Crystalline Si Solar Cells
Date Issued
2015
Date
2015
Author(s)
Hsu, Chien-Hsiung
Abstract
In order to solve the energy crisis, many renewable energy resources rise, such as hydro, wind, solar cells. Among so many renewable energy , the best advantage of solar cell is not limited by place .Solar cells are divided into many types ,such as silicon ,III-V ,dye-sensitized ,CIGS solar cells, etc., Silicon base solar cells is the mainstream, so the silicon base solar cells with low cost , mature production technology and high yield , so how to reduce its costs continually is an important issue. This thesis topic is using a simple and mass-produced way to etch hierarchical antireflection structure on industrial silicon based solar cells. However ,this thesis propose that using metal-assisted chemical etching to etch different size nanopores on micro-scale pyramid texture to form hierarchical antireflection structure. This structure enable incident light absorption effectively and low reflectance in 400 nm to 1000 nm. So base on this concept ,we discuss the different nanopores size how to impact the reflectance in 400 nm to 1000 nm ,I-V property and its morphology. The nanopores process can be divided into two parts .First, deposition Ag thin film with thickness 20 nm by E-gun evaporation system ,and then use rapid thermal annealing system to form the bigger Ag particle ,called two step metal-assisted chemical etching. We discuss the relationship between nanopores size and reflectance in this part. Second, We use AgNO3 and HF ,called one step metal-assisted chemical etching, to etch the smaller nanopores on micro-scale pyramid texture. We discuss the relationship between nanopores size and reflectance, I-V property. We use the low-cost metal-assisted etching process, making the surface hierarchical antireflective structure, showing very excellent reflectance performance, and can effectively make mass-produced solar cells.
Subjects
Industrial-scale
Crystalline Si Solar Cells
Hierarchical Antireflection Structure
SDGs
Type
thesis