Skip to main content

13 Result(s)

within Y.M. Li Remove this filter Materials Engineering Remove this filter

and

  1. No Access

    Article

    Effects of Interfaces on the a-Si:H Schottky Barrier Characteristics

    A detailed study of hydrogenated amorphous silicon (a-Si:H) surfaces during etching and subsequent low temperature (T≤200°C) oxidation was carried out using in-situ and spectroscopic ellipsometry (SE). The micros...

    Y. M. Li, C. Malone, S. Kumar, C. R. Wronski… in MRS Online Proceedings Library (1990)

  2. No Access

    Article

    Surface Microstructural Evolution of Ultrathin films by Real time Spectroscopic Elupsometry

    Vapor deposition of smooth, microstructurally uniform amorphous films on dissimilar substrates requires coalescence of clusters that form during initial nucleation. We have developed techniques that provide su...

    R. W. Collins, Ilsinan An, Y. M. Li, C. R. Wronski in MRS Online Proceedings Library (1991)

  3. No Access

    Article

    Comments on the Determination of Defect Density in a-Si:H Alloys by Integrating the Sub-Bandgap Optical Absorption Coefficient

    The validity of determining the defect density in a-Si:H and its alloys by integrating the sub-bandgap optical absorption coefficient is examined. It is shown that a formula derived for estimating Si-Hbonddens...

    Y.-M. Li, W. Paul in MRS Online Proceedings Library (1991)

  4. No Access

    Article

    Optical Properties of Hydrogenated Amorphous Silicon, Silicon-Germanium and Silicon-Carbon Thin Films

    The optical properties of solar cell grade hydrogenated amorphous silicon (a-Si:H), silicon germanium (a-SiGe:H) and silicon carbon (a-SiC:H) alloy thin films have been investigated over a wide photon energy r...

    R. M. Dawson, Y. M. Li, M. Gunes, D. Heller, S. Nag… in MRS Online Proceedings Library (1992)

  5. No Access

    Article

    The Mechanism for Defect Generation Studied by Photodegradation of A-Si:H Solar Cells Under Electrical Bias

    The light induced degradation of a-Si:H p-i-n solar cells under electrical bias has been systematically studied. By comparing the results with the light intensity dependence of cell degradation under open circ...

    Liyou Yang, L. Chen, J. Y. Hou, Y. M. Li in MRS Online Proceedings Library (1992)

  6. No Access

    Article

    Optoelectronic Properties of Plasma CVD a-Si:H Modified by Filament-Generated Atomic H

    We have studied a-Si:H prepared by alternating plasma deposition with atomic H treatments performed with a heated W filament. Real time spectroscopie ellipsometry provides the evolution of film thickness, opti...

    Y. M. Li, I. An, M. Gunes, R. M. Dawson, R. W. Collins… in MRS Online Proceedings Library (1992)

  7. No Access

    Article

    Experimental Determination of the Dark Fermi Level in Hydrogenated Amorphous Silicon.

    The position of the dark fermi level in hydrogenated amorphous silicon (a-Si:H) is important in determining its electrical properties and is a key parameter in the detailed modelling of materials and devices. ...

    R. M. Dawson, S. Nag, M. Gunes, C.R. Wronski, M. Bennett… in MRS Online Proceedings Library (1992)

  8. No Access

    Article

    Photocarrier Transport and Recombination in Amorphous Silicon

    The effect of microstructure in undoped a-Si:H films on carrier transport, recombination, densities of midgap states and solar cell characteristics has been investigated. Extended state mobilities of electrons...

    C. R. Wronski, R. M. Dawson, M. Gunes, Y. M. Li… in MRS Online Proceedings Library (1993)

  9. No Access

    Article

    Sub-Surface Equilibration of Hydrogen with the a-Si:H Network Under Film Growth Conditions

    In this study we characterize hydrogen diffusion and reaction processes in the near-surface (top 200 Å) of a-Si:H that lead to network equilibration under standard conditions of plasma-enhanced chemical vapor ...

    Ilsin An, Y.M. Li, C.R. Wronski, R.W. Collins in MRS Online Proceedings Library (1993)

  10. No Access

    Article

    An Exploratory Survey of p-Layers for a-Si:H Solar Cells

    The window layer (p-layer) critically affects the conversion efficiency of a-Si:H based p-i-n type solar cells. This paper surveys possible alternative window materials in comparison with the standard boron doped...

    Y.-M. Li, F. Jackson, L. Yang, B. F. Fieselmann… in MRS Online Proceedings Library (1994)

  11. No Access

    Article

    The Staebler-Wronski Effect and the Thermal Equilibration of Defect and Carrier Concentrations

    Light induced degradation of intrinsic Amorphous silicon (a-Si:H) is investigated as a function of temperature. Previous work described an equilibrium framework for the high temperature behavior of dangling bo...

    R. M. A. Dawson, C. M. Fortmann, Y. M. Li, C. R. Wronski in MRS Online Proceedings Library (1994)

  12. No Access

    Article

    A Comprehensive Study of Plasma Enhanced Crystallization of a-Si:H Films on Glass

    An extensive study is reported here on plasma enhanced crystallization of a-Si:H films on glass. Both electron cyclotron resonance (ECR) helium plasma exposures and ECR oxygen plasma exposures were investigate...

    Aiguo Yin, Stephen J. Fonash, D. M. Reber, Y. M. Li… in MRS Online Proceedings Library (1994)

  13. No Access

    Article

    Experimental study on the effect of alternating ageing and sea corrosion on laminated natural rubber bearing’s tension-shear property

    The laminated natural rubber bearings (NRBs) used in offshore or sea-crossing bridges, are subjected to marine environments over an extended period and therefore vulnerable to the effect of alternating ageing ...

    Y. M. Li, Y. H. Ma, G. F. Zhao, F. L. Zhou in Journal of Rubber Research (2020)