'Green processing' of thin film with top-hat lasers and applications in photovoltaic

摘要

In this paper we will discuss the fundamental aspect of ablation processes by using laser beams of different intensity profiles and cross sections. For characterizing the efficiency of pulse energy for the ablation process the effective energy efficiency and the effective overall efficiency can be used. The effective energy efficiency and effective overall efficiency of laser beams with circular Gaussian profile and two dimensional top-hat profile will be given. The circular Gaussian profile with a maximum effective overall efficiency of 30% is the most inefficient beam for ablation process. Ideal two dimensional top-hat profile has 100% effective overall efficiency and is the most efficient choice for thin film ablation process. Also the lowest influence of waste energy during ablation process with two dimensional top-hat profile is expected. In the talk energy and cost effective system concepts for "green processing" at high through put and application results in photovoltaic will be discussed.