Absolute work function measurement by using photoelectron spectroscopy

Work function (WF) of a material is not only an intrinsic characteristic of bulk but also a surface property. The measurement and control of WF have been of great concern in many electronic and optical devices as the WF governs charge transfer and charge injection/collection efficiency at interfaces...

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Bibliographic Details
Published in:Current applied physics Vol. 31; pp. 52 - 59
Main Authors: Kim, Jeong Won, Kim, Ansoon
Format: Journal Article
Language:English
Published: Elsevier B.V 01.11.2021
한국물리학회
Subjects:
Photoelectron spectroscopy
Surface electric dipole
Work function
물리학
Photoelectron spectroscopy
Work function
Surface electric dipole
ISSN:1567-1739, 1878-1675
Online Access:Get full text
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Summary:Work function (WF) of a material is not only an intrinsic characteristic of bulk but also a surface property. The measurement and control of WF have been of great concern in many electronic and optical devices as the WF governs charge transfer and charge injection/collection efficiency at interfaces and emission characteristics of conventional charged particle emitters. Photoelectron spectroscopy (PES) has been mainly used to determine surface electronic structure and chemical composition. Despite the common use of this technique to measure WF, there has been a lack of discussion on how to use the PES and what to be considered to determine the absolute WF. The main contribution of this review lies in the discussion of the causes of errors when measuring WF, and provides a guide for reliable WF measurement. Along with the limitations of current measurement technology, we propose future directions for absolute WF measurement. [Display omitted] •Definition of work function and applications in materials and devices.•Principles of absolute work function measurement by photoelectron spectroscopy.•Many factors to consider in measuring work function by PES.•Future expansion of the WF measurement technology.
Bibliography:https://www.sciencedirect.com/science/article/pii/S1567173921001796?via%3Dihub
ISSN:1567-1739
1878-1675
DOI:10.1016/j.cap.2021.07.018