Laser-induced dendritic structures on PET (polyethylene- terephthalate): the importance of redeposited ablation products

Klose, S.; Arenholz, E.; Heitz, J.; Bäuerle, D.

doi:10.1007/s003390051447

Cited by 17 publications

(12 citation statements)

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“…4 Surface structuring observed in the ablation regime is generally related to the backscattering of the ejected products in collisions with the surrounding atmosphere. 5 It is noteworthy that considerably less attention has been directed to studies of semiconductor surface modifications induced by irradiation at the intermediate-I regime, which produces high density of electronic excitation in the solid but leads to deposited energy that is well below the thermal ablation threshold. In this case surface modifications may appear as a result of local expulsion of neutrals and excited species at the nanoscale because of electronic energy transfer from excitons or electron-hole plasma (EHP).…”

Section: Introductionmentioning

confidence: 99%

Surface modification of monocrystalline zinc oxide induced by high-density electronic excitation

Museur

Manousaki

Anglos

et al. 2011

Journal of Applied Physics

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Strong modifications of semiconductors can be provoked by high-density electronic excitation. We report on surface structuring of monocrystalline wurtzite O-face (0001) ZnO excited by UV femtosecond laser pulses (248 nm) below the ablation threshold. At fluences above 11 mJ/cm 2 , nanoholes of D¼10 nm diameter appear quasi-periodically separated by a distance $30 nm (¼3 D). Dual-pulse (pump-pump) experiments permit estimation of the electronic excitation lifetime responsible for this nanostructuring, which is in agreement with the electron-hole plasma lifetime 220 ps. The nanostructuring results in a smaller monocrystalline domain of $0.1 lm size and increases the crystalline interplane c-distance by 0.11%. The excitonic luminescence of the irradiated sample is found to increase by about 10 times. The nanostructuring remains stable in a limited range of laser fluences: above 40 mJ/cm 2 the surface melts, which accelerates the photoinduced bonds breaking leading to surface erosion. We tentatively ascribe the related mechanism to the nucleation-growth of cluster vacancies at crystal dislocations accelerated by the non-thermal (electronic) melting of the surface layer. At fluences lower than 11 mJ/cm 2 , larger volcano-like features of 60-nm diameter were observed. The characteristic crater shape and irregular surface repartition permit their assignment to thermal explosion of impurities due to multiple exciton condensation. V

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Section: Introductionmentioning

confidence: 99%

Surface modification of monocrystalline zinc oxide induced by high-density electronic excitation

Museur

Manousaki

Anglos

et al. 2011

Journal of Applied Physics

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“…Firstly, the PET film was almost transparent at the laser excitation wavelength (355 nm), and the absorbed single photon energy (3.49 eV at 355 nm) was insufficient to break the polymer backbone bonds directly (3.69 eV for C-C). The photothermal mechanism dominated the laser processing or ablation process of the PET film, and the decomposition of the PET polymer chains was mainly pyrolysis [13,26,[33][34][35]. Secondly, regarding the laser irradiation and photothermal conversion, the PET polymer chains either decomposed into small molecules or short-chain polymers, or recomposed [13,26,36].…”

Section: Laser Ablation Mechanism Of Pet Filmmentioning

confidence: 99%

Temperature Field-Assisted Ultraviolet Nanosecond Pulse Laser Processing of Polyethylene Terephthalate (PET) Film

Rong

Liu

et al. 2021

Micromachines

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Understanding the mechanism of and how to improve the laser processing of polymer films have been important issues since the advent of the procedure. Due to the important role of a photothermal mechanism in the laser ablation of polymer films, especially in transparent polymer films, it is both important and effective to adjust the evolution of heat and temperature in time and space during laser processing by simply adjusting the ambient environment so as to improve and understand the mechanism of this procedure. In this work, studies on the pyrolysis of PET film and on temperature field-assisted ultraviolet nanosecond (UV-ns) pulse laser processing of polyethylene terephthalate (PET) film were performed to investigate the photothermal ablation mechanism and the effects of temperature on laser processing. The results showed that the UV-ns laser processing of PET film was dominated by the photothermal process, in which PET polymer chains decomposed, melted, recomposed and reacted with the ambient gases. The ambient temperature changed the heat transfer and temperature distribution in the laser processing. Low ambient temperature reduced the thermal effect and an increase in ambient temperature improved its efficiency (kerf width: 39.63 μm at −25 °C; 48.30 μm at 0 °C; 45.81 μm at 25 °C; 100.70 μm at 100 °C) but exacerbated the thermal effect.

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“…14.6) has been studied for most UV wavelengths (308 nm [91], 266 nm [92], 248 nm, 193 nm [93,94], and 157 nm [95]). At 157 nm, a low ablation threshold and mainly gaseous ablation products are observed, which suggests an ablation process that is dominated by photochemical reactions.…”

Section: Poly(ethylene Terephthalate)mentioning

confidence: 99%

Photoablation of Polymer Materials

Urech

Lippert

2010

Photochemistry and Photophysics of Polymer Materials

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Laser-induced dendritic structures on PET (polyethylene- terephthalate): the importance of redeposited ablation products

Cited by 17 publications

References 0 publications

Surface modification of monocrystalline zinc oxide induced by high-density electronic excitation

Surface modification of monocrystalline zinc oxide induced by high-density electronic excitation

Temperature Field-Assisted Ultraviolet Nanosecond Pulse Laser Processing of Polyethylene Terephthalate (PET) Film

Photoablation of Polymer Materials

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