Solar Junction Corporation

Vijit A Sabnis

Michael West Wiemer

Ting Liu

Homan Bernard Yuen

Pranob Misra

Michael J Sheldon

Onur Fidaner

Ferran Suarez

Rebecca Elizabeth Jones-Albertus

Ewelina Natalia Lucow

Daniel Derkacs

Micahel West Wiemer

A single-step wet etch process is provided to isolate multijunction solar cells on semiconductor substrates, wherein the wet etch chemistry removes semiconductor materials nonselectively without a major difference in etch rate between different heteroepitaxial layers. The solar cells thus formed comprise multiple heterogeneous semiconductor layers epitaxially grown on the semiconductor substrate.

Method for etching multi-layer epitaxial material

A multi junction solar cell is provided with a non-alloyed ohmic contact metallization stack by inversion of the top semiconductor layer from n-type to p-type and including the utilization of a tunnel junction. Alternatively, the non-alloyed ohmic contact can be achieved by changing the top semiconductor layer from a higher bandgap material to a lower bandgap material.

Non-alloyed contacts for III-V based solar cells

Multijunction solar cells having at least four subcells are disclosed, in which at least one of the subcells comprises a base layer formed of an alloy of one or more elements from group III on the periodic table, nitrogen, arsenic, and at least one element selected from the group consisting of Sb and Bi, and each of the subcells is substantially lattice matched. Methods of manufacturing solar cells and photovoltaic systems comprising at least one of the multijunction solar cells are also disclosed.

High efficiency multijunction solar cells

Growing community of inventors

Cupertino, CA, United States of America

Vijit A Sabnis