Ab initio Calculations of Deep-Level Carrier Nonradiative Recombination Rates in Bulk Semiconductors

<div class="aps-abstractbox"><p>Nonradiative carrier recombination is of both applied and fundamental interest. Here a novel algorithm is introduced to calculate such a deep level nonradiative recombination rate using the <span style="font-style: italic">ab&nbsp;initio</span> density functional theory. This algorithm can calculate the electron-phonon coupling constants all at once. An approximation is presented to calculate the phonon modes for one impurity in a large supercell. The neutral Zn impurity site together with a N vacancy is considered as the carrier-capturing deep impurity level in bulk GaN. Its capture coefficient is calculated as 5.57&times;10^-10&thinsp;&thinsp;cm³/s at 300&nbsp;K. We found that there is no apparent onset of such a nonradiative process as a function of temperature.</p>