Patent ID: 7056808

Claim:
A method of forming substrates, the method comprising: providing a donor substrate; forming a cleave layer comprising a cleave plane on the donor substrate, the cleave layer comprising silicon germanium; forming a device layer on the cleave layer, the device layer comprising epitaxial silicon; introducing particles into the cleave layer to add stress to the cleave plane, where the particles are introduced in a manner substantially free from microbubble or microcavity formation of the particles along the cleave plane within the cleave layer; redistributing a portion of the particles within the cleave layer to form a higher concentration region of the particles in a region in a vicinity of the cleave plane, where the distribution is carried out in a manner substantially free from microbubble or microcavity formation of the particles along the cleave plane within the cleave layer; providing selected energy to the donor substrate to cleave the device layer at the cleave plane, whereupon the selected energy is applied to create a controlled cleaving action to remove the device layer from a portion of the cleave layer in a controlled manner.