Direct observation of amophization in load rate dependent nanoindentation studies of crystalline Si

Das, C. R.; Dhara, Sandip; Jeng, Yeau-Ren; Tsai, Ping Chi; Hsu, Hsu Cheng; Raj, Baldev; Bhaduri, A.K.; Albert, S. K.; Tyagi, A.K.; Chen, L. C.; Chen, K. H.

doi:10.1063/1.3456380

Cited by 24 publications

(8 citation statements)

References 20 publications

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“…1). The observed A and B load-declines mark pop-in events registered in depth-controlled experiments [3,9], similarly to the multiple pop-in phenomenon reported in early silicon research [12,15,25]. , concurring with a number of previous findings, e.g., [14], while remains at odds with others, e.g., [12,18].…”

supporting

confidence: 72%

Origin of a Nanoindentation Pop-in Event in Silicon Crystal

2017

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supporting

confidence: 72%

Origin of a Nanoindentation Pop-in Event in Silicon Crystal

2017

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“…The parameter values for P(VDF-TrFE) were taken from the reported piezoelectric constants evaluated experimentally based on converse piezoelectric method 22 23 while the properties for other materials including c-Si, Pt and PUA were taken from the literature 14 24 25 . A constant load was applied while the voltage was changed from 0 V to 5 V as shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Vertically aligned P(VDF-TrFE) core-shell structures on flexible pillar arrays

Choi

Yun

Qaiser

et al. 2015

Sci Rep

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PVDF and P(VDF-TrFE) nano- and micro- structures have been widely used due to their potential applications in several fields, including sensors, actuators, vital sign transducers, and energy harvesters. In this study, we developed vertically aligned P(VDF-TrFE) core-shell structures using high modulus polyurethane acrylate (PUA) pillars as the support structure to maintain the structural integrity. In addition, we were able to improve the piezoelectric effect by 1.85 times from 40 ± 2 to 74 ± 2 pm/V when compared to the thin film counterpart, which contributes to the more efficient current generation under a given stress, by making an effective use of the P(VDF-TrFE) thin top layer as well as the side walls. We attribute the enhancement of piezoelectric effects to the contributions from the shell component and the strain confinement effect, which was supported by our modeling results. We envision that these organic-based P(VDF-TrFE) core-shell structures will be used widely as 3D sensors and power generators because they are optimized for current generations by utilizing all surface areas, including the side walls of core-shell structures.

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“…The observation of dislocation plasticity was attributed to a special effect of free surface dislocation nucleation being favored in their test system. Alternatively, Das, Dhara, Jeng, Tsai, Hsu, Raj, Bhaduri, Albert, Tyagi, L. Chen and K. Chen [233] report direct observation of amorphization of p-type silicon under an indentation by means of accompanying in-situ Raman spectroscopy measurements at ~1 micrometer spatial resolution of the probing laser beam. Load-indentation depth curves were obtained under different low rate loading conditions, including pop-in observations and "pop-out" steps in the unloading curves.…”

Section: Electron Microscopymentioning

confidence: 99%

Elastic, Plastic, Cracking Aspects of the Hardness of Materials

Armstrong

Elban

Walley

2013

Int. J. Mod. Phys. B

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The hardness properties of materials are tracked from early history until the present time. Emphasis is placed on the hardness test being a useful probe for determining the local elastic, plastic and cracking properties of single crystal, polycrystalline, polyphase or amorphous materials. Beginning from connection made between individual hardness pressure measurements and the conventional stress–strain properties of polycrystalline materials, the newer consideration is described of directly specifying a hardness-type stress–strain relationship based on a continuous loading curve, particularly, as obtained with a spherical indenter. Such effort has received impetus from order-of-magnitude improvements in load and displacement measuring capabilities that are demonstrated for nanoindentation testing. Details of metrology assessments involved in various types of hardness tests are reviewed. A compilation of measurements is presented for the separate aspects of Hertzian elastic, dislocation-mechanics-based plasticity and indentation-fracture-mechanics-based cracking behaviors of materials, including elastic and plastic deformation rate effects. A number of test applications are reviewed, most notably involving the hardness of thin film materials and coatings.

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Direct observation of amophization in load rate dependent nanoindentation studies of crystalline Si

Cited by 24 publications

References 20 publications

Origin of a Nanoindentation Pop-in Event in Silicon Crystal

Origin of a Nanoindentation Pop-in Event in Silicon Crystal

Vertically aligned P(VDF-TrFE) core-shell structures on flexible pillar arrays

Elastic, Plastic, Cracking Aspects of the Hardness of Materials

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