Electronic excitation and secondary electron emission studies by low-energy electrons backscattered from thin polystyrene film surfaces

Rego, A.M. Botelho do; Vilar, M. Rei; Silva, J.Lopes Da; Heyman, M.; Schott, M.

doi:10.1016/0039-6028(86)90313-4

Cited by 18 publications

(2 citation statements)

References 8 publications

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“…These groups should contribute to the optical and electronic properties of the material by introducing internal transition level, depicted as (5) in figure 18. The photoemission threshold is at about 7 eV, but electron energy losses appear in the 4-7 eV range presumably due to electronic excitation as revealed by low energy backscattered electron spectroscopy [195]. Because of the narrow bands for extended states characteristic of inorganic materials, on the one hand, and of the disorder introduced in the material, the cross-section spectrum can be something different from the one plotted in figure 19.…”

Section: Difference Between Thermal and Optical Excitation Techniquesmentioning

confidence: 92%

Charge trap spectroscopy in polymer dielectrics: a critical review

Teyssèdre¹,

Zheng²,

Boudou³

et al. 2021

J. Phys. D: Appl. Phys.

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Trapping phenomena are essential features controlling the transport properties of insulating materials. Depending on the energy depth, traps can either assist transport or lead to long-lasting storage of charges. The consequences of charge trapping are non-linear phenomena and electric field distribution distortion in the dielectric bulk. The important characteristics about traps are the nature of the levels, their depth in energy, and their density. In this review, we discuss the different techniques available to probe the energetics of traps, particularly in insulating polymers. The methods implemented for approaching the characteristics of traps range from atomistic simulation based on known physical/chemical defects, identification by spectroscopic techniques, and coupled opticalelectrical or thermal-electrical techniques. The review is focused on methods involving thermal or optical excitation coupled to detection using electrical or luminescence response with questioning about the physical hypotheses behind the analysis and the difference in response obtained through the various approaches. The technical implementation of these methods is described, along with examples of application. The differences in trap depth estimation from optical and thermal methods is discussed as well as the impact of having distributed trap depths. The input of luminescence techniques, which provide a fingerprint of chemical groups involved in charge recombination, is put forward.

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Section: Difference Between Thermal and Optical Excitation Techniquesmentioning

confidence: 92%

Charge trap spectroscopy in polymer dielectrics: a critical review

Teyssèdre¹,

Zheng²,

Boudou³

et al. 2021

J. Phys. D: Appl. Phys.

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“…3,10) Also, surface activation by electron irradiation could induce secondary electrons of very low energy, which could be used in surface spectroscopy inspection 15,16) or induce electronic excitation and=or ionization, which in turn make appreciable changes in the modified material. 17,18) CR-39 and Makrofol polycarbonate plastics are popular examples of PNTDs that had been studied extensively under the influence of different types of radiations and energies. [19][20][21][22] These two PNTDs detect neutrons and different kinds of charged particles effectively.…”

Section: Introductionmentioning

confidence: 99%

Optical and chemical behaviors of CR-39 and Makrofol plastics under low-energy electron beam irradiation

El-Saftawy

Aal

Hassan

et al. 2016

Jpn. J. Appl. Phys.

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In this study, CR-39 and Makrofol plastic nuclear track detectors were irradiated with low-energy electron beams to study the effect of the induced changes on their optical and chemical properties. Surface chemical changes were recorded by Fourier transform infrared (FTIR) spectroscopy, which showed successive degradation and crosslinking for CR-39 and decomposition for Makrofol. The optical band gap was determined by UVvis spectroscopy. Also, the parameters of carbon cluster formation and disordering (Urbach's energy) occurring on plastic surfaces were examined. The intrinsic viscosity changes were investigated as well. As a result, low-energy electron beams were found to be useful for the control of many properties of the surfaces of the investigated detectors.

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