Wisconsin Alumni Research Foundation

Hongyi Mi

Zhenqiang Ma

Shaoqin Gong

Jung-Hun Seo

Tzu-Hsuan Chang

Yunming Wang

Kanglin Xiong

Tandem solar cells comprising two or more solar cells connected in a solar cell stack via pn diode tunnel junctions and methods for fabricating the tandem solar cells using epitaxial lift off and transfer printing are provided. The tandem solar cells have improved tunnel junction structures comprising a current tunneling layer integrated between the p and n layers of the pn diode tunnel junction that connects the solar cells.

Hybrid tandem solar cells with improved tunnel junction structures

Piezoresistive composite materials comprising electrically conductive particles in a polymeric phase change material are provided. Also provided are strain sensors incorporating the composites and methods for detecting mechanical strain using the composites.

Piezoresistive strain sensors comprising electrically conducting networks in polymeric phase change materials

Composite materials comprising electrically conductive particles in a form-stable phase change materials (PCMs) are provided. Also provided as radiation sensors incorporating the composites and methods for detecting radiation using the composites. The PCMs comprise crosslinked polyether polyol that undergoes a reversible solid-solid phase change upon heating. Prior to the phase change, the crosslinked polyether polyol comprises microscopic crystalline domains. When the PCM is heated beyond its phase transition temperature these microscopic crystalline domains melt. However, the form-stable PCMs retain their solid form at the macroscopic level.

Growing community of inventors

Madison, WI, United States of America

Hongyi Mi