Mechanically stacked multijunction solar cells are provided. In one embodiment, a mechanically stacked, multijunction solar cell comprises: a first solar cell having a first bandgap; a second solar cell having a second bandgap; and a plurality of spaced apart metal pillars sandwiched between the first solar cell and the second solar cell.
GOVERNMENT LICENSE RIGHTS
 The United States Government has rights in this invention under Contract No. DE-AC36-08GO28308 between the United States Department of Energy and the Alliance for Sustainable Energy, LLC, the Manager and Operator of the National Renewable Energy Laboratory.