T/ZSA 39-2020 Abolished Group standards

T/ZSA 39-2020 Graphene testing method: Determination of work function using ultraviolet photoelectron spectroscopy

Publish Date: 2020-12-17 Implement Date: 2020-12-18 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

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Basic Information

Standard Code: T/ZSA 39-2020

Standard Type: Group standards

Standard Status: Abolished

is_force_gb: no

CCS Name: Oxides, elemental substances

ICS Name: Electrician and electronic testing

Publish Date: 2020-12-17

Implement Date: 2020-12-18

Scope

Scope: This document specifies the terms and definitions, principles, test conditions, instruments and equipment, samples, test procedures, and test reports for measuring the work function of graphene films by ultraviolet photoelectron spectroscopy (UPS). This document is applicable to the determination of the work function of graphene. The determination of the work function of other transparent conductive film materials can be carried out with reference to this document. Main technical content: The determination of the work function of conductive films plays a crucial role in the application of display devices. With the mass production of flexible displays based on new materials such as graphene, there is an increasing demand for accurately determining the work function of graphene flexible conductive films in the industrialization process. So far, the mainstream method for determining the work function is the Kelvin Probe Force Microscopy (KPFM) method. This method is accurate and can simultaneously obtain information about the morphology of materials within the test range, so it is widely used in the market to test the work function of indium tin oxide (ITO) glass in the previous generation of non-flexible display devices. The disadvantage of the KPFM method is that the test time is relatively long and the test range is small, typically ranging from tens to hundreds of square micrometers. Due to the high defect density of graphene films, the uniformity of the work function distribution in the film is lower than that in ITO glass. At this point, the advantages of using ultraviolet photoelectron spectroscopy (UPS) to determine the work function gradually become apparent. Firstly, the maximum test range of UPS can reach 2 mm2, which to some extent avoids the overly microscopic characteristics of KPFM. Secondly, UPS testing is convenient and fast, and the test results can be obtained within a few minutes. In addition, UPS can also simultaneously obtain the band s