Electronic Processes in Thin-Film PV Materials: Final Report

Research output: NRELSubcontract Report

Abstract

The electronic and optical processes in an important class of thin-film PV materials, hydrogenated amorphous silicon (a-Si:H) and related alloys, have been investigated using several experimental techniques designed for thin-film geometries. The experimental techniques include various magnetic resonance and optical spectroscopies and combinations of these two spectroscopies. Two-step opticalexcitation processes through the manifold of silicon dangling bond states have been identified as important at low-excitation energies. Local hydrogen motion has been studied using nuclear magnetic resonance (NMR) techniques and found to be more rapid than long-range diffusion as measured by secondary-ion mass spectroscopy. A new metastable effect has been found in a-Si:H films alloyed withsulfur. Spin-one optically excited states have been unambiguously identified using optically detected electron spin resonance. Local hydrogen bonding in microcrystalline silicon films has been studied using NMR.
Original languageAmerican English
Number of pages146
StatePublished - 1998

Bibliographical note

Work performed by University of Utah, Salt Lake City, Utah

NREL Publication Number

  • NREL/SR-520-24840

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