Electro-optic and thermal studies of multi-quantum well light emitting diodes in InGaN/GaN/sapphire structure

Jeong Park, Moo Whan Shin, Chin C. Lee

Research output: Contribution to journalConference articlepeer-review


We present an electrical model for quantum-well light emitting diodes (LEDs) with a current spreading layer. The LEDs studied have a Multi-Quantum Well (MQW) between p-GaN and the n-GaN grown on sapphire. The model consists of a diode connected with a series resistor resulting from the current spreading layer. Using the model, the I-V curve of the diode itself is extracted from the measured LED I-V curve. The model also includes a current equation for the diode itself which was subsequently sought to match the extracted I-V curve. In the seeking process, junction temperature (T j) rather than case temperature (T c) was used in the equation. The diode model allows one to calculate the reduction on conversion efficiency caused by the current spreading layer. Results show that the current spreading layer causes 20% of the efficiency reduction at T j = 107°C. The model can be used to optimize the conversion efficiency by balancing the transparency and the resistance of current spreading layer.

Original languageEnglish
Article numberE10.4
Pages (from-to)563-568
Number of pages6
JournalMaterials Research Society Symposium Proceedings
Publication statusPublished - 2005
Event2004 MRS Fall Meeting - Boston, MA, United States
Duration: 2004 Nov 292004 Dec 2

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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