Abstract
The effect of spontaneous and piezoelectric polarizations on optical characteristics of blue InGaN light-emitting diodes (LEDs) is investigated in this work with the APSYS simulation program. Specifically, the band diagram, carrier distribution, radiative recombination current, and light-current performance curves are discussed for various polarization situations. According to the simulation results, the amount of polarization charges is dominated by piezoelectric polarization. Therefore, the band diagram and overlap between electrons and holes in quantum wells are improved effectively and the light-current performance is raised apparently as the piezoelectric polarization is removed and only the spontaneous polarization is taken into account. The possible reason is that the influence of piezoelectric polarization due to lattice constant mismatch on optical properties is severe than the spontaneous polarization due to asymmetry of the wurtzite structure along the c-axis. Moreover, the simulation results suggest that the blue InGaN LED structures with spontaneous polarization may provide higher output power but are more sensitive to temperature, in a range from 300 K to 350 K, when compared to the LED structures with piezoelectric polarization.
| Original language | English |
|---|---|
| Title of host publication | Seventh International Conference on Solid State Lighting |
| DOIs | |
| Publication status | Published - 2007 Dec 1 |
| Event | 7th International Conference on Solid State Lighting - San Diego, CA, United States Duration: 2007 Aug 27 → 2007 Aug 29 |
Publication series
| Name | Proceedings of SPIE - The International Society for Optical Engineering |
|---|---|
| Volume | 6669 |
| ISSN (Print) | 0277-786X |
Other
| Other | 7th International Conference on Solid State Lighting |
|---|---|
| Country | United States |
| City | San Diego, CA |
| Period | 07-08-27 → 07-08-29 |
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All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Computer Science Applications
- Applied Mathematics
- Electrical and Electronic Engineering
Cite this
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Effect of spontaneous and piezoelectric polarization on the optical characteristics of blue light-emitting diodes. / Kuo, Yen Kuang; Yen, Sheng Horng; Tsai, Miao Chan; Liou, Bo Ting.
Seventh International Conference on Solid State Lighting. 2007. 66691I (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 6669).Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
TY - GEN
T1 - Effect of spontaneous and piezoelectric polarization on the optical characteristics of blue light-emitting diodes
AU - Kuo, Yen Kuang
AU - Yen, Sheng Horng
AU - Tsai, Miao Chan
AU - Liou, Bo Ting
PY - 2007/12/1
Y1 - 2007/12/1
N2 - The effect of spontaneous and piezoelectric polarizations on optical characteristics of blue InGaN light-emitting diodes (LEDs) is investigated in this work with the APSYS simulation program. Specifically, the band diagram, carrier distribution, radiative recombination current, and light-current performance curves are discussed for various polarization situations. According to the simulation results, the amount of polarization charges is dominated by piezoelectric polarization. Therefore, the band diagram and overlap between electrons and holes in quantum wells are improved effectively and the light-current performance is raised apparently as the piezoelectric polarization is removed and only the spontaneous polarization is taken into account. The possible reason is that the influence of piezoelectric polarization due to lattice constant mismatch on optical properties is severe than the spontaneous polarization due to asymmetry of the wurtzite structure along the c-axis. Moreover, the simulation results suggest that the blue InGaN LED structures with spontaneous polarization may provide higher output power but are more sensitive to temperature, in a range from 300 K to 350 K, when compared to the LED structures with piezoelectric polarization.
AB - The effect of spontaneous and piezoelectric polarizations on optical characteristics of blue InGaN light-emitting diodes (LEDs) is investigated in this work with the APSYS simulation program. Specifically, the band diagram, carrier distribution, radiative recombination current, and light-current performance curves are discussed for various polarization situations. According to the simulation results, the amount of polarization charges is dominated by piezoelectric polarization. Therefore, the band diagram and overlap between electrons and holes in quantum wells are improved effectively and the light-current performance is raised apparently as the piezoelectric polarization is removed and only the spontaneous polarization is taken into account. The possible reason is that the influence of piezoelectric polarization due to lattice constant mismatch on optical properties is severe than the spontaneous polarization due to asymmetry of the wurtzite structure along the c-axis. Moreover, the simulation results suggest that the blue InGaN LED structures with spontaneous polarization may provide higher output power but are more sensitive to temperature, in a range from 300 K to 350 K, when compared to the LED structures with piezoelectric polarization.
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UR - http://www.scopus.com/inward/citedby.url?scp=42149102536&partnerID=8YFLogxK
U2 - 10.1117/12.733860
DO - 10.1117/12.733860
M3 - Conference contribution
AN - SCOPUS:42149102536
SN - 9780819468178
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - Seventh International Conference on Solid State Lighting
ER -