Experimental Determination of the Dominant Type of Auger Recombination in InGaN Quantum Wells

Abstract

We investigate theoretically the influence of type and density of background carriers in the active region on the quantum efficiency of InGaN-based light emitters using an extension of the ABC rate model. A method to determine experimentally whether a certain type of Auger recombination is relevant in InGaN quantum wells is derived from these considerations. Using this approach, we show that the physical process which is the dominant cause for the efficiency droop is superlinear in the electron density and can thus be assigned to nnp-Auger recombination.

Towards quantification of the crucial impact of auger recombination for the efficiency droop in (AlInGa)N quantum well structures

“…In this letter, we increase the fraction of droop which can be ascribed to Auger processes to at least 15 % by applying the approach by Binder et al to optimized test structures. Furthermore, we experimentally confirm that C nnp exceeds C npp [10,11] in contrast to many theoretical calculations [6,12] and additionally quantify the ratio to 1 < C nnp /C npp ≤ 12.…”

“…Increasing one type of Auger recombination rate more than the other can be realized by introducing background carriers in the green QWs as will be shown by the following evaluations using an extended ABC rate equation model [10].…”

Solid-State Lighting Based on Light Emitting Diode Technology

“…5.13). Solving the 'green gap' and 'efficiency droop' problems is currently a key focus for research both in academia and industry [12, [50][51][52][53][54][55][56].…”

Determination of recombination coefficients in InGaN quantum-well light-emitting diodes by small-signal time-resolved photoluminescence

“…the reduction of efficiency with increasing drive current, 1,2) which has been discussed widely in literature and has been attributed to Auger recombination [3][4][5] experimentally. In addition, an extension of the emission wavelength into the "Green Gap" 1,6) has proven to be challenging.…”