Wisconsin Alumni Research Foundation

University of Chicago

Tzu-Hsuan Chang

Zhenqiang Ma

Shaoqin Gong

Jung-Hun Seo

Hongyi Mi

Kanglin Xiong

Paul Franklin Nealey

Michael Scott Arnold

Yei Hwan Jung

Robert Michael Jacobberger

Shisheng 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

Radiation detectors based on high electron mobility transistors (HEMTs) are provided. Methods for detecting ultraviolet radiation using the HEMTs are also provided. The transistors are constructed from an intrinsic high bandgap semiconductor material with a built-in polarization field sandwiched between graphene and a two-dimensional electron gas (2DEG).

High performance, high electron mobility transistors with graphene hole extraction contacts

Provided herein are methods of directed self-assembly (DSA) on atomic layer chemical patterns and related compositions. The atomic layer chemical patterns may be formed from two-dimensional materials such as graphene. The atomic layer chemical patterns provide high resolution, low defect directed self-assembly. For example, DSA on a graphene pattern can be used achieve ten times the resolution of DSA that is achievable on a three-dimensional pattern such as a polymer brush. Assembly of block copolymers on the atomic layer chemical patterns may also facilitate subsequent etch, as the atomic layer chemical patterns are easier to etch than conventional pattern materials.

Atomic layer chemical patterns for block copolymer assembly

Substantially biodegradable microwave integrated circuits and method for making the microwave integrated circuits are provided. The integrated circuits, which have applications in high performance flexible microwave and digital electronics, utilize biobased, biodegradable cellulose nanofibril films as a substrate and comprise only very small amounts of potentially toxic inorganic materials.

Biodegradable microwave electronic devices

Growing community of inventors

Madison, WI, United States of America

Tzu-Hsuan Chang