Electronic transport characterization of silicon wafers by spatially resolved steady-state photocarrier radiometric imaging

Wang, Qian; Li, Bincheng

doi:10.1063/1.4931773

Cited by 6 publications

(1 citation statement)

References 22 publications

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“…Here, τ represents the diffusion of electrons into the solution (i.e., the relaxation time) and τ′ represents the diffusion of electrons on the surface of the silicon wafer, which is about 50 μs. 51 For clarity, the initial 70% of the descending edge is used for each pulse in this work. 46 Minimal Inhibitory Concentration Determination.…”

Section: Methodsmentioning

confidence: 99%

Assembly-Induced Membrane Selectivity of Artificial Model Peptides through Entropy–Enthalpy Competition

Wei,

Tu,

et al. 2024

ACS Nano

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Peptide design and drug development offer a promising solution for combating serious diseases or infections. In this study, using an AI−human negotiation approach, we have designed a class of minimal model peptides against tuberculosis (TB), among which K7W6 exhibits potent efficacy attributed to its assembly-induced function. Comprising lysine and tryptophan with an amphiphilic α-helical structure, the K7W6 sequence exhibits robust activity against various infectious bacteria causing TB (including clinically isolated and drug-resistant strains) both in vitro and in vivo. Moreover, it synergistically enhances the effectiveness of the first-line antibiotic rifampicin while displaying low potential for inducing drug resistance and minimal toxicity toward mammalian cells. Biophysical experiments and simulations elucidate that K7W6's exceptional performance can be ascribed to its highly selective and efficient membrane permeabilization activity induced by its distinctive self-assembly behavior. Additionally, these assemblies regulate the interplay between enthalpy and entropy during K7W6−membrane interaction, leading to the peptide's two-step mechanism of membrane interaction. These findings provide valuable insights into rational design principles for developing advanced peptide-based drugs while uncovering the functional role played by assembly.

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Section: Methodsmentioning

confidence: 99%

Assembly-Induced Membrane Selectivity of Artificial Model Peptides through Entropy–Enthalpy Competition

Wei,

Tu,

et al. 2024

ACS Nano

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Surface recombination property of silicon wafers determined accurately by self-normalized photocarrier radiometry

Wang

Luo

Gong

et al. 2022

Infrared Physics & Technology

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Accurate determination of electronic transport properties of silicon wafers by nonlinear photocarrier radiometry with multiple pump beam sizes

Wang

2015

Journal of Applied Physics

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In this paper, photocarrier radiometry (PCR) technique with multiple pump beam sizes is employed to determine simultaneously the electronic transport parameters (the carrier lifetime, the carrier diffusion coefficient, and the front surface recombination velocity) of silicon wafers. By employing the multiple pump beam sizes, the influence of instrumental frequency response on the multi-parameter estimation is totally eliminated. A nonlinear PCR model is developed to interpret the PCR signal. Theoretical simulations are performed to investigate the uncertainties of the estimated parameter values by investigating the dependence of a mean square variance on the corresponding transport parameters and compared to that obtained by the conventional frequency-scan method, in which only the frequency dependences of the PCR amplitude and phase are recorded at single pump beam size. Simulation results show that the proposed multiple-pump-beam-size method can improve significantly the accuracy of the determination of the electronic transport parameters. Comparative experiments with a p-type silicon wafer with resistivity 0.1–0.2 Ω·cm are performed, and the electronic transport properties are determined simultaneously. The estimated uncertainties of the carrier lifetime, diffusion coefficient, and front surface recombination velocity are approximately ±10.7%, ±8.6%, and ±35.4% by the proposed multiple-pump-beam-size method, which is much improved than ±15.9%, ±29.1%, and >±50% by the conventional frequency-scan method. The transport parameters determined by the proposed multiple-pump-beam-size PCR method are in good agreement with that obtained by a steady-state PCR imaging technique.

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Electronic transport characterization of silicon wafers by spatially resolved steady-state photocarrier radiometric imaging

Cited by 6 publications

References 22 publications

Assembly-Induced Membrane Selectivity of Artificial Model Peptides through Entropy–Enthalpy Competition

Assembly-Induced Membrane Selectivity of Artificial Model Peptides through Entropy–Enthalpy Competition

Surface recombination property of silicon wafers determined accurately by self-normalized photocarrier radiometry

Accurate determination of electronic transport properties of silicon wafers by nonlinear photocarrier radiometry with multiple pump beam sizes

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