An integrated solar thermal and photovoltaic apparatus. The apparatus includes a solar thermal module, and a photovoltaic module comprising a plurality of solar cells configured in a polymeric material. The apparatus has an amorphous material configured between the thermal solar module and the photovoltaic module. The amorphous material has a semi-viscous, thermally conductive, and mastic characteristic to allow for thermal expansion and contraction of either or both the photovoltaic module or the solar thermal module during an operating time. The apparatus has an aperture region provided on a first side of the photovoltaic module and the solar thermal module is overlying a second side of the photovoltaic module. The thermal solar module, the photovoltaic module, and the amorphous material form an integrated thermal solar module.
 This invention was made by support of the U.S. Government Alliance for Sustainable Energy, LLC Management and Operating Contractor For the National Renewable Energy Laboratory ("NREL") under Subcontract No. AEU-2-22001-01, and the U.S. Government may have certain rights in this invention.