Highly charged ion interactions with thin insulating films

Pomeroy, Joshua M.; Lake, Russell; Sosolik, C. E.

doi:10.1016/j.nimb.2010.11.006

Cited by 9 publications

(6 citation statements)

References 21 publications

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“…Electron tunneling spectroscopy and resistance-temperature measurements confirm that devices remain tunneling after irradiation of the barriers [12]. Extensive dI/dV measurements of irradiated devices indicate that impacts do not cause a significant decrease in barrier height φ [26,27]. Furthermore, the four decade span of σ c (Q) with no saturation in conductance demonstrates that charge state dependent cratering decreases the barrier thickness and drives a tunneling conductance increase.…”

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confidence: 90%

Charge State Dependent Energy Deposition by Ion Impact

et al. 2011

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We report on a measurement of craters in thin dielectric films formed by Xe(Q+) (26 ≤ Q ≤ 44) projectiles. Tunnel junction devices with ion-irradiated barriers were used to amplify the effect of charge-dependent cratering through the exponential dependence of tunneling conductance on barrier thickness. Electrical conductance of a crater σ(c)(Q) increased by 4 orders of magnitude (7.9 × 10(-4) μS to 6.1 μS) as Q increased, corresponding to crater depths ranging from 2 to 11 Å. By employing a heated spike model, we determine that the energy required to produce the craters spans from 8 to 25 keV over the investigated charge states. Considering energy from preequilibrium nuclear and electronic stopping as well as neutralization, we find that at least (27 ± 2)% of available projectile neutralization energy is deposited into the thin film during impact.

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confidence: 90%

Charge State Dependent Energy Deposition by Ion Impact

et al. 2011

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“…Recent experimental work on nanostructure formation due to HCI impact on insulating surfaces indicates that the main part of the potential energy is released within the first nm of the solid [6,23,24]. Direct transmission measurements of HCI through 1 nm thick carbon nanomembranes showed [16] that the charge exchange is bimodal, namely one part of the ions stabilize only very few electrons during transmission and therefore deposit almost no potential energy in the target material.…”

Section: Energy Loss and Charge Exchangementioning

confidence: 99%

Highly charged ion induced nanostructures at surfaces by strong electronic excitations

Wilhelm¹,

El-Said²,

Heller³

et al. 2015

Progress in Surface Science

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a b s t r a c tNanostructure formation by single slow highly charged ion impacts can be associated with high density of electronic excitations at the impact points of the ions. Experimental results show that depending on the target material these electronic excitations may lead to very large desorption yields in the order of a few 1000 atoms per ion or the formation of nanohillocks at the impact site. Even in ultra-thin insulating membranes the formation of nanometer sized pores is observed after ion impact. In this paper, we show recent results on nanostructure formation by highly charged ions and compare them to structures and defects observed after intense electron and light ion irradiation of ionic crystals and graphene. Additional data on energy loss, charge exchange and secondary electron emission of highly charged ions clearly show that the ion charge dominates the defect formation at the surface.

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“…Therefore, the interaction of HCI with surfaces may not be described in terms of an equilibrium charge state dependent stopping force. Furthermore, due to the localization of the energy deposition slow HCI can be used as an efficient tool for surface nano-structuring [13][14][15][16][17][18][19][20][21][22][23][24] and tuning of the electrical properties of materials [25], as well as a probe for surface energy deposition processes [26,27]. Recently, it has been shown that slow HCI can create pores in 1 nm thick carbon nanomembranes (CNM) [28,29] mainly by deposition of their potential energy [30].…”

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Charge Exchange and Energy Loss of Slow Highly Charged Ions in 1 nm Thick Carbon Nanomembranes

et al. 2014

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Experimental charge exchange and energy loss data for the transmission of slow highly charged Xe ions through ultra-thin polymeric carbon membranes are presented. Surprisingly, two distinct exit charge state distributions accompanied by charge exchange dependent energy losses are observed. The energy loss for ions exhibiting large charge loss shows a quadratic dependency on the incident charge state indicating that equilibrium stopping force values do not apply in this case. Additional angle resolved transmission measurements point on a significant contribution of elastic energy loss. The observations show that regimes of different impact parameters can be separated and thus a particle's energy deposition in an ultra-thin solid target may not be described in terms of an averaged energy loss per unit length. Modern approaches in ion and electron irradiation of solids such as nano-structuring of thin films or even structuring of free-standing monolayers such as graphene [1][2][3] or MoS 2 [4, 5] rely on models for structural and electronic defect formation. Most important for processes during ion-solid interaction is the amount of deposited energy and its dissipation channels [6]. We show that the energy loss and charge exchange of ions in very thin films, such as 2D-materials, show significant differences to solids with reduced thickness. The understanding of these differences is not only of importance for ion beam analysis of 2D-materials but in particular for manipulating and tailoring their properties. [7]. To probe interaction processes in very thin target materials slow highly charged ions (HCI) are ideal tools due to their energy deposition confinement to shallow surface regions. Besides the well known near-surface potential energy deposition [8,9] also an expected increased pre-equilibrium kinetic energy loss (stopping force) [10] is confined to a few nm at the surface. In the conventional description of both contributions to the stopping force, i.e. nuclear and electronic stopping, the charge state of an ion is identified with its equilibrium charge state by Bohr's stripping criterion [11,12]. The equilibrium charge state by Bohr is given as Q eq = Z 1/3 v/v 0 and describes the (average) charge state of an ion passing through a solid at a given velocity v (v 0 : Bohr's velocity, Z: nuclear charge of the ion). The charge state Q of slow highly charged ions is much higher than the equilibrium charge state Q eq (Q eq Q < ∼ Z). Therefore, the interaction of HCI with surfaces may not be described in terms of an equilibrium charge state dependent stopping force. Furthermore, due to the localization of the energy deposition slow HCI can be used as an efficient tool for surface nano-structuring [13][14][15][16][17][18][19][20][21][22][23][24] and tuning of the electrical properties of materials [25], as well as a probe for surface energy deposition processes [26,27]. Recently, it has been shown that slow HCI can create pores in 1 nm thick carbon nanomembranes (CNM) [28,29] mainly by deposition of their potential ...

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Highly charged ion interactions with thin insulating films

Cited by 9 publications

References 21 publications

Charge State Dependent Energy Deposition by Ion Impact

Charge State Dependent Energy Deposition by Ion Impact

Highly charged ion induced nanostructures at surfaces by strong electronic excitations

Charge Exchange and Energy Loss of Slow Highly Charged Ions in 1 nm Thick Carbon Nanomembranes

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