IFGARD (Internal Field Guarded Active Region Device)
Patent 16007/TUB

This invention comprises a so-called semiconductor layer sequence, which can be used in LEDs, for example.

  1. Boost of the decay rate of radiation exciton
  2. Establishing of the electrical potential as a tunable parameter
  3. Decoupled detrimental effects of crystal Polarization
  4. Useable for quantum light sources
Possible Applications

The system can be used in edge emitting lasers, in LEDs, in single photon sources with various wave lengths or in any other (quantum-) light sources.


Modern opto-electronic devises are based on semiconductor hetero- structures employing the process of electron-hole pair annihilation. In particular polar materials enable to create a variety of classic and even quantum light sources. However, the key challenge – the inherent electrical crystal polarization of such materials – remains unsolved and thus deteriorates the electron-hole pair annihilation rate. The invention presented here introduces a new approach to adjusting those polarization effects. It marks the onset of an entire new class of ultra-fast and efficient devices based on any polar material.

Technical Description

Former research in this field had focused on less-polar crystal planes or even on the stabilization of unnatural phases, but never was able to gain industrial maturity. The new approach introduces a sequence of reverse interfaces to compensate for these polarization effects, while the natural polar crystal growth direction is maintained. This specific approach is provoking a boost in the performance of the device. This approach allows for an adaptation in all established industrial processes, while the polarization becomes adjustable, even below zero.

As a result, not only the radiative exciton decay rates are being significantly increased, even so the electric potential as a tunable parameter could be established. Hence we soon can expect the creation of, e.g. (quantum-) light sources based on polar heterostructures. The optical signatures of such light sources are decoupled from the detrimental effects of crystal polarization.

Contact Us

Ina Krüger

Technology Transfer Manager

+49 (0)30 314-75916

Technology Readiness Level

Technology validated in relevant environment

Property Rights

approved: CN, DE, FR, GB, US

Patent Holder

Technische Universität Berlin

Possible Cooperation
  • R&D Cooperation
  • Licensing
  • Patent Purchase