Abstract
The effects of the white-light X-ray and 170-keV proton beam irradiation on the electrical and optical characteristics of the InGaN/GaN multiple quantum wells (MQWs) light-emitting diodes (LEDs) are analyzed and compared. Different from the negative effects of the proton irradiation, the X-ray irradiation shows positive effects on the LEDs' performance. In detail, after the 100 Mrad(Si) X-ray irradiation, the p-n junction resistance decreases from the original 2.51 to 2.08Ω , the light output power increases from 170 to 203 mW (at a forward voltage of 3.2 V), and the maximal external quantum efficiency (EQE) increases from 56.7% to 61.8%. Based on the ABC model fittings, both the Shockley-Read-Hall recombination rate and the radiative recombination rate in the MQWs are improved by the X-ray irradiation. The Hall effect measurements reveal the chemical bond breaking of the Mg-H complex in the p-type GaN. Therefore, the improvement of the LED by the X-ray irradiation should be caused by the chemical bond variations of the defect-related complex in the MQWs and the Mg-H complex in the p-type GaN.
| Original language | English |
|---|---|
| Article number | 9003180 |
| Pages (from-to) | 1345-1350 |
| Number of pages | 6 |
| Journal | IEEE Transactions on Nuclear Science |
| Volume | 67 |
| Issue number | 7 |
| DOIs | |
| State | Published - Jul 2020 |
| Externally published | Yes |
Keywords
- ABC model
- InGaN/GaN multiple quantum wells (MQWs)
- Mg-H
- X-ray
- external quantum efficiency (EQE)
- hall measurement
- p-type GaN
- proton
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