Thermoacoustic and thermoreflectance imaging of biased integrated circuits: Voltage and temperature maps

E. Hernández-Rosales; E. Cedeño; J. Hernandez-Wong; J. B. Rojas-Trigos; E. Marin; F. C.G. Gandra; A. M. Mansanares

doi:10.1063/1.4959828

Thermoacoustic and thermoreflectance imaging of biased integrated circuits: Voltage and temperature maps

E. Hernández-Rosales, E. Cedeño, J. Hernandez-Wong, J. B. Rojas-Trigos, E. Marin, F. C.G. Gandra, A. M. Mansanares

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4 Scopus citations

Abstract

In this work a combined thermoacoustic and thermoreflectance set-up was designed for imaging biased microelectronic circuits. In particular, it was used with polycrystalline silicon resistive tracks grown on a monocrystalline Si substrate mounted on a test chip. Thermoreflectance images, obtained by scanning a probe laser beam on the sample surface, clearly show the regions periodically heated by Joule effect, which are associated to the electric current distribution in the circuit. The thermoacoustic signal, detected by a pyroelectric/piezoelectric sensor beneath the chip, also discloses the Joule contribution of the whole sample. However, additional information emerges when a non-modulated laser beam is focused on the sample surface in a raster scan mode allowing imaging of the sample. The distribution of this supplementary signal is related to the voltage distribution along the circuit.

Original language	English
Article number	041902
Journal	Applied Physics Letters
Volume	109
Issue number	4
DOIs	https://doi.org/10.1063/1.4959828
State	Published - 25 Jul 2016
Externally published	Yes

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title = "Thermoacoustic and thermoreflectance imaging of biased integrated circuits: Voltage and temperature maps",

abstract = "In this work a combined thermoacoustic and thermoreflectance set-up was designed for imaging biased microelectronic circuits. In particular, it was used with polycrystalline silicon resistive tracks grown on a monocrystalline Si substrate mounted on a test chip. Thermoreflectance images, obtained by scanning a probe laser beam on the sample surface, clearly show the regions periodically heated by Joule effect, which are associated to the electric current distribution in the circuit. The thermoacoustic signal, detected by a pyroelectric/piezoelectric sensor beneath the chip, also discloses the Joule contribution of the whole sample. However, additional information emerges when a non-modulated laser beam is focused on the sample surface in a raster scan mode allowing imaging of the sample. The distribution of this supplementary signal is related to the voltage distribution along the circuit.",

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AU - Hernández-Rosales, E.

AU - Cedeño, E.

AU - Hernandez-Wong, J.

AU - Rojas-Trigos, J. B.

AU - Marin, E.

AU - Gandra, F. C.G.

AU - Mansanares, A. M.

PY - 2016/7/25

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AB - In this work a combined thermoacoustic and thermoreflectance set-up was designed for imaging biased microelectronic circuits. In particular, it was used with polycrystalline silicon resistive tracks grown on a monocrystalline Si substrate mounted on a test chip. Thermoreflectance images, obtained by scanning a probe laser beam on the sample surface, clearly show the regions periodically heated by Joule effect, which are associated to the electric current distribution in the circuit. The thermoacoustic signal, detected by a pyroelectric/piezoelectric sensor beneath the chip, also discloses the Joule contribution of the whole sample. However, additional information emerges when a non-modulated laser beam is focused on the sample surface in a raster scan mode allowing imaging of the sample. The distribution of this supplementary signal is related to the voltage distribution along the circuit.

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Thermoacoustic and thermoreflectance imaging of biased integrated circuits: Voltage and temperature maps

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