Increase in the Shockley–Read–Hall recombination rate in InGaN/GaN QWs as the main mechanism of the efficiency droop in LEDs at high injection levels
| Autor: | Yu. G. Shreter, N. I. Bochkareva, Yu. T. Rebane |
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| Rok vydání: | 2015 |
| Předmět: |
Condensed Matter::Quantum Gases
Physics Condensed matter physics business.industry Condensed Matter Physics Capacitance Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials law.invention Tunnel effect law Hall effect Optoelectronics Voltage droop business Quantum tunnelling Quantum well Diode Light-emitting diode |
| Zdroj: | Semiconductors. 49:1665-1670 |
| ISSN: | 1090-6479 1063-7826 |
| DOI: | 10.1134/s1063782615120040 |
| Popis: | It is shown that the efficiency droop observed as the current through a GaN-based light-emitting diode increases is due to a decrease in the Shockley–Read–Hall nonradiative lifetime. The lifetime decreases with increasing current because a steadily growing number of traps in the density-of-states tails of InGaN/GaN quantum wells become nonradiative recombination centers upon the approach of quasi-Fermi levels to the band edges. This follows from the correlation between the efficiency droop and the appearance of negative differential capacitance, observed in the study. The correlation appears due to slow trap recharging via the trap-assisted tunneling of electrons through the n-type barrier of the quantum well and to the inductive nature of the diode-current variation with forward bias. |
| Databáze: | OpenAIRE |
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