Innovation

PIN Diodes for Fast Photodetection, and High-Speed, High-Resolution Imaging and Sensing

Wisconsin Alumni Research Foundation (University of Wisconsin)
posted on 04/25/2008

PIN diodes are semiconductor devices that include an undoped intrinsic semiconductor region between the p-type and n-type regions. These diodes are commonly integrated as photodetectors on silicon CMOS chips for imaging sensing in digital cameras. Silicon CMOS technology offers several advantages, including ease of processing and large-scale integration; however, the speed of silicon-based PIN diodes tends to be slow. Germanium and silicon-germanium (SiGe) alloys offer promising alternative materials for high-quality, CMOS-compatible photodetectors, but the large lattice mismatch between Si and Ge has so far limited their use. By employing improved methods for integrating Si and Ge in thin multilayer structures, or “nanomembranes” (see WARF reference number P04286US), the inventors have created PIN diodes in which the intrinsic layer is Ge or SiGe and the p-type and n-type layers are silicon. In some applications, these nanomembrane PIN diodes are fabricated on a solid silicon-on-insulator support. In others, the nanomembranes are released from the support and transferred to flexible substrates, such as plastic films.

Advantages

  • Promises to increase the resolution and readout speed of digital imaging technologies such as digital cameras and video cameras
  • Germanium absorbs light more efficiently over a wider spectrum than silicon
  • Nanomembranes can be transferred to plastic films and other flexible substrates to provide flexible photodetectors and image sensors
  • Fully compatible with silicon CMOS technology
  • Fabrication technique achieves desired strain levels in device layers without introducing defects

Innovation Details

IP Protection


License Online

This innovation currently is not available for online licensing. Please contact Christine Najdowski at Wisconsin Alumni Research Foundation (University of Wisconsin) for more information.

Request more info via email request more info
People

Case Manager:

Christine  Najdowski Christine Najdowski

Innovations (763)


Download Technology Brief (PDF)


Followed By

Follow this innovation



No one is following this innovation.

Organization
Communities
Profile
Related Tags

Find more innovations


February 11, 2009

12,949 members 17,272 innovations 176 organizations

Browse

Linda L. Restifo, M.D., Ph.D. - University of Arizona

"I want to say again how happy I am about the iBridge Network mechanism. This seems ideal for NeuronMetrics and I'm very pleased we will be part of this venture."  read more...