Density of states of Cs3Sb calculated using density-functional theory for modeling photoemission

Daniel Finkenstadt; Samuel G. Lambrakos; Kevin L. Jensen; Andrew Shabaev; Nathan A. Moody

doi:10.1117/12.2272759

6 September 2017 Density of states of Cs₃Sb calculated using density-functional theory for modeling photoemission

Daniel Finkenstadt, Samuel G. Lambrakos, Kevin L. Jensen, Andrew Shabaev, Nathan A. Moody

Proceedings Volume 10374, Optical Modeling and Performance Predictions IX; 103740L (2017) https://doi.org/10.1117/12.2272759
Event: SPIE Optical Engineering + Applications, 2017, San Diego, California, United States

Abstract

An analysis is presented that provides a density of states (DOS or D(E)) factor for Cs₃Sb in the calculation of its quantum efficiency QE and emittance ε_n;rms using a Moments Approach. The analysis is based on density functional theory (DFT) adapted for the practical application of treating photoemission from bulk metal and semiconductor materials, and the interfaces between them. The Moments approach treats the processes of absorption, transmission and emission separately, for which DFT affects parameters and processes associated with each step, of which D, the optical constants n and k, and materials parameters such as effective mass m_n and band gap E_g are paramount. Such factors are required to provide the components of an evaluation similar to the Tsu-Esaki formula for calculating current density over and through and over barriers, and will become more important when a proper quantum mechanical treatment of the emission barrier is considered beyond the simplistic thermal model (transmission probability is unity only for energy levels in excess of the barrier height and zero otherwise). Such features are expected to be far more consequential if the barrier supports resonant levels, e.g., heterostructures.

Citation Download Citation

Daniel Finkenstadt, Samuel G. Lambrakos, Kevin L. Jensen, Andrew Shabaev, and Nathan A. Moody "Density of states of Cs₃Sb calculated using density-functional theory for modeling photoemission", Proc. SPIE 10374, Optical Modeling and Performance Predictions IX, 103740L (6 September 2017); https://doi.org/10.1117/12.2272759

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available