Methods of Surface Analysis

Overview

Class Central Tips

There is a vast variety of contemporary surface analysis methods that you can use for your research. If you are not sure which one is right for you, or if you want to obtain the right information about different surface analysis techniques, then this course is for you!

This course describes the most widely used analysis methods in contemporary surface science. It presents the strengths and weaknesses of each method so that you can choose the one that provides you with the information you need. It also reviews what each method cannot give to you, as well as how to interpret the results obtained from each method.

This course is filled with examples to help you become familiar with the graphs and figures obtained from common surface analysis methods.

Each method is described in a similar way: basic principle, apparatus scheme, example results, special features, and actual device examples.

Syllabus

Introduction

Module 1 gets the students familiar with the main features of modern surface analysis methods and values, which they could provide. Question-answer concept. An interesting correlation between analytical spot size and composition accuracy is shown and explained.

Particle Diagnostics. Secondary Ion Mass Spectrometry (SIMS)

This module deals with methods which utilize heavy particles (protons and other ions) as primary bombarding particles. In SIMS sputtering yield is being analyzed, giving great information on surface composition.

Particle Diagnostics. Rutherford Backscattering

This module deals with methods which utilize heavy particles (protons and other ions) as primary bombarding particles. In a family of RBS, ERD and partially NRA methods simple Newtonian laws of elastic collisions lead to a precise knowledge of surface composition. A tiny bit of nuclear physics is present in the NRA method though it shares basic principles with RBS and ERD.

Electron Diagnostics. Spectroscopy

These methods use an electron beam as primary. Knowing the all the atoms have their signature band structure on can use that knowledge to identify the elements with AES and EDS methods. They both need a primary electron beam and they both rely on creating vacancies in the core energy leveles and filling of these vacancies with higher level electrons. In AES Auger electron energies are measured as they are emitted from the specimen. In EDS characteristic X-ray photon energies are measured. Both give information on the sample composition though in a different way, yet having the same starting processes.

Electron Diagnostics. Microscopy

One could not mention electron microscopes when talking about electron diagnostics. TEM and SEM are discussed, and their basic principles exposed. Methods of obtaining better quality images are shown.

X-ray Diagnostics

Of many X-ray diagnostics XPS stands out as the most popular. This powerful tool utilizes the photo-emission effect. A primary X-ray beam leads to the emission of photo-electrons from the sample. By measuring of their energy one can precisely obtain elemental and even chemical composition of the sample.