Development of Cs-free ultraviolet III-nitride photocathodes

Date of Award

1-1-2018

Language

English

Document Type

Dissertation

Degree Name

Doctor of Philosophy (PhD)

College/School/Department

Department of Nanoscale Science and Engineering

Program

Nanoscale Engineering

Content Description

1 online resource (ix, 387 pages) : illustrations.

Dissertation/Thesis Chair

Fatemeh (Shadi) Shahedipour-Sandvik

Committee Members

Lloyd D Bell, Bradley Thiel, Eric Lifshin, Alex Xue

Keywords

Photocathodes, Ultraviolet detectors, Nitrides, Cesium coating, Nanostructured materials, Nanostructures

Subject Categories

Nanoscience and Nanotechnology

Abstract

III-nitride based photocathodes have been the subject of much research in photoemissive devices for ultraviolet (UV) detection in astronomy and defense applications. In order to achieve high quantum efficiency (QE), negative electron affinity (NEA) is necessary to allow for carriers that have relaxed to the conduction band minimum to escape. NEA in III-nitride UV photocathodes is conventionally reached via cesium-based surface treatment of p-type GaN. However, this treatment is highly reactive in air and photocathodes using this technology have been reported to suffer from chemical instability and QE degradation over time.

Comments

Requested ProQuest takedown; no end date

Additional Files
figure_permissions.zip (1073 kB)

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