  Modern opto-electronic devices are based on semiconductor heterostructures
employing the process of electron-hole pair annihilation. In particular polar
materials enable a variety of classic and even quantum light sources, whose
on-going optimisation endeavours challenge generations of researchers. However,
the key challenge - the inherent electric crystal polarisation of such
materials - remains unsolved and deteriorates the electron-hole pair
annihilation rate. Here, our approach introduces a sequence of reverse
interfaces to compensate these polarisation effects, while the polar, natural
crystal growth direction is maintained provoking a boost in device performance.
Former research approaches like growth on less-polar crystal planes or even the
stabilization of unnatural phases never reached industrial maturity. In
contrast, our solution allows the adaptation of all established industrial
processes, while the polarisation becomes adjustable; even across zero. Hence,
our approach marks the onset of an entire class of ultra-fast and efficient
devices based on any polar material.
