A 3D simulation comparison of carrier transport in green and blue c-plane multi-quantum well nitride light emitting diodes
Abstract
Until recently, the electrical efficiency of green nitride light-emitting diodes (LEDs) was considerably lower than that of blue LEDs. This is particularly surprising as one would expect a reduced forward voltage with increasing emission wavelength. In this paper, we theoretically investigated the impact of the number of quantum wells on the forward voltage of III-nitride LEDs with x = 0.15 (blue) and x = 0.24 (green) InxGa1–xN QWs. The simulated dependence of current density (J) on applied diode bias (V) shows a significant increase of 1.9 V in the forward voltage between one and five quantum well (QW) c-plane green LED structures. Artificially turning off the polarization fields in the simulation does not entirely suppress this effect. Due to the large band offsets in the green LED multiple QW stack, simulations indicate a sequential band filling of the QW sequence. Furthermore, this mechanism should not be limited to c-plane LEDs and could also be present in nonpolar or semipolar devices.
- Authors:
-
- Univ. of California, Santa Barbara, CA (United States)
- National Taiwan Univ., Taipei (Taiwan)
- Univ. of California, Santa Barbara, CA (United States); Ecole Polytechnique, Palaiseau Cedex (France)
- Publication Date:
- Research Org.:
- Univ. of California, Santa Barbara, CA (United States)
- Sponsoring Org.:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Building Technologies Office; National Science Foundation (NSF); Ministry of Science and Technology
- OSTI Identifier:
- 1740009
- Alternate Identifier(s):
- OSTI ID: 1737845
- Grant/Contract Number:
- EE0008204; DMS-1839077; MOST 108-2628-E-002-010-MY3; MOST 110-2923-E-002-002
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Applied Physics
- Additional Journal Information:
- Journal Volume: 128; Journal Issue: 23; Journal ID: ISSN 0021-8979
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Nitrides; Light emitting diodes; Quantum wells; Electronic transport; Semiconductor device modeling
Citation Formats
Lheureux, Guillaume, Lynsky, Cheyenne, Wu, Yuh-Renn, Speck, James S., and Weisbuch, Claude. A 3D simulation comparison of carrier transport in green and blue c-plane multi-quantum well nitride light emitting diodes. United States: N. p., 2020.
Web. doi:10.1063/1.5143276.
Lheureux, Guillaume, Lynsky, Cheyenne, Wu, Yuh-Renn, Speck, James S., & Weisbuch, Claude. A 3D simulation comparison of carrier transport in green and blue c-plane multi-quantum well nitride light emitting diodes. United States. https://doi.org/10.1063/1.5143276
Lheureux, Guillaume, Lynsky, Cheyenne, Wu, Yuh-Renn, Speck, James S., and Weisbuch, Claude. Thu .
"A 3D simulation comparison of carrier transport in green and blue c-plane multi-quantum well nitride light emitting diodes". United States. https://doi.org/10.1063/1.5143276. https://www.osti.gov/servlets/purl/1740009.
@article{osti_1740009,
title = {A 3D simulation comparison of carrier transport in green and blue c-plane multi-quantum well nitride light emitting diodes},
author = {Lheureux, Guillaume and Lynsky, Cheyenne and Wu, Yuh-Renn and Speck, James S. and Weisbuch, Claude},
abstractNote = {Until recently, the electrical efficiency of green nitride light-emitting diodes (LEDs) was considerably lower than that of blue LEDs. This is particularly surprising as one would expect a reduced forward voltage with increasing emission wavelength. In this paper, we theoretically investigated the impact of the number of quantum wells on the forward voltage of III-nitride LEDs with x = 0.15 (blue) and x = 0.24 (green) InxGa1–xN QWs. The simulated dependence of current density (J) on applied diode bias (V) shows a significant increase of 1.9 V in the forward voltage between one and five quantum well (QW) c-plane green LED structures. Artificially turning off the polarization fields in the simulation does not entirely suppress this effect. Due to the large band offsets in the green LED multiple QW stack, simulations indicate a sequential band filling of the QW sequence. Furthermore, this mechanism should not be limited to c-plane LEDs and could also be present in nonpolar or semipolar devices.},
doi = {10.1063/1.5143276},
journal = {Journal of Applied Physics},
number = 23,
volume = 128,
place = {United States},
year = {Thu Dec 17 00:00:00 EST 2020},
month = {Thu Dec 17 00:00:00 EST 2020}
}
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