Patent ID: 8143511
Filing Date: 2012-03-27
Classification: H01L,Y02E,Y02P

Abstract:
1. A composite structure comprising: a cleaved layer of photovoltaic material having a first layer and a second layer of porous semiconductor crystalline material, both layers comprised of a plurality of wormhole structures wherein density distribution of the wormhole structures in the first layer ranges from 10 10 /cm 3 to 10 20 /cm 3 and density distribution of the wormhole structures in the second layer ranges from 10/cm 3 to 10 10 /cm 3 , wherein the second layer is in between the first layer and a support, the cleaved layer comprised of a cleaved surface being textured with a surface roughness configured to capture photons illuminated thereon, the surface roughness being greater than about 100 nanometers to cause less than about 25% reflection from a total amount of illuminated photons in a wavelength ranging from about 0.1 micron to about 5 microns, the cleaved surface extending along the entire layer of photovoltaic material and the cleaved surface being configured and positioned to receive the photons by facing in a direction of the illuminating photons while the second layer of the cleaved layer faces in a direction away from an incident light source; one or more photovoltaic devices formed in the cleaved layer; the support comprising a glue layer overlying a surface of the second layer; and a permeable membrane structure selected from a mesh structure or a textile structure overlying the glue layer, the permeable membrane structure having a plurality of pores with a size ranging from about one micron to about one hundred microns and configured to facilitate outgassing of any volatile species in the glue layer to allow the glue layer to bind the permeable membrane structure to the surface of the second layer of the cleaved layer of photovoltaic material; a backplane overlying a backside of the permeable membrane structure.