Location

Brunswick, ME

Start Date

1-1-1997 12:00 AM

Description

The common feature of all previous photothermal studies of semiconductors is that only electronically homogeneous materials have been assumed. Correspondingly, both carrier lifetime (τ) and diffusivity (D n ) values have been usually taken to be the bulk characteristics of semiconductor and no experimental works or theoretical models have addressed the problem of τ and D n depth profile reconstructions. For continuously inhomogeneous solids the treatment of the thermal-wave propagation problem using a Hamilton-Jacobi formalism of the thermal oscillating field has been presented [1] and the concept of the thermal harmonic oscillator (THO) has been successfully used for the thermal difiusivity profile reconstruction [2,3]. The present work is the result of the realization that an electron-hole photoexcited plasma also behaves like a carrier density diffusive wave [4], and, therefore, it can be theoretically treated as a plasma harmonic oscillator (PHO).

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

16A

Chapter

Chapter 1: Standard Techniques

Section

Thermal Waves

Pages

371-378

DOI

10.1007/978-1-4615-5947-4_49

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Noncontact Lifetime Reconstruction in Continuously Inhomogeneous Semiconductors: Generalized Theory and Experimental Photothermal Results for Ion-Implanted Si

Brunswick, ME

The common feature of all previous photothermal studies of semiconductors is that only electronically homogeneous materials have been assumed. Correspondingly, both carrier lifetime (τ) and diffusivity (D n ) values have been usually taken to be the bulk characteristics of semiconductor and no experimental works or theoretical models have addressed the problem of τ and D n depth profile reconstructions. For continuously inhomogeneous solids the treatment of the thermal-wave propagation problem using a Hamilton-Jacobi formalism of the thermal oscillating field has been presented [1] and the concept of the thermal harmonic oscillator (THO) has been successfully used for the thermal difiusivity profile reconstruction [2,3]. The present work is the result of the realization that an electron-hole photoexcited plasma also behaves like a carrier density diffusive wave [4], and, therefore, it can be theoretically treated as a plasma harmonic oscillator (PHO).