Methods and devices for increase power output from solar devices. In one embodiment, the technique enables the front hot solar panel surface to be cooled by attachment of a thermoelectric multilayer stack to the back solar panel surface. The thermoelectric stack cools the solar panel front surface by drawing heat from the front to the back of the panel. That heat is transformed into mechanical vibrations using an inverse Peltier effect and that mechanical energy then transformed into electrical energy using a piezoelectric effect. Power output is first increased by lower operating temperature on front, resulting in a higher power conversion efficiency for the photovoltaic effect taking place in the CIGS/CdS active layers or other thin films, then from an additional power output from secondary electrical energy created from mechanical arising from the temperature-gradient driven occurrence of the thermoelectric effect.