Leland Stanford Junior University

Garrett J Hayes

Bruce M Clemens

Alberto Salleo

James Randy Groves

Bingrui Joel Li

A biaxially textured crystalline layer formed on a substrate using ion beam assisted deposition (IBAD) is provided. The biaxially textured crystalline layer includes an oriented CaFcrystalline layer having crystalline grains oriented in both in-plane and out-of-plane directions, where the out-of-plane orientation is a (111) out-of-plane orientation. The oriented CaFcrystalline layer is disposed for growth of a subsequent epitaxial layer and the CaFcrystalline layer is an IBAD CaFlayer. The biaxially textured CaFlayer can be used in a photovoltaic cell, an electronic or optoelectronic device, an integrated circuit, an optical sensor, or a magnetic device.

Depositing calcium fluoride template layers for solar cells

This work provides a new approach for epitaxial liftoff. Instead of using a sacrificial layer that is selectively etched chemically, the sacrificial layer selectively absorbs light that is not absorbed by other parts of the structure. Under sufficiently intense illumination with such light, the sacrificial layer is mechanically weakened, melted and/or destroyed, thereby enabling epitaxial liftoff. The perimeter of the semiconductor region to be released is defined (partially or completely) by lateral patterning, and the part to be released is also adhered to a support member prior to laser irradiation. The end result is a semiconductor region removed from its substrate and adhered to the support member.

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Livermore, CA, United States of America

Garrett J Hayes