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Current-induced degradation behaviors of InGaN/GaN multiple quantum well UV photodetectors: Role of electrically active defects by Pradip Dalapati; Abdulaziz Almalki; Sultan Alhassan; Saud Alotaibi; Maryam Al Huwayz; Taiki Nakabayashi; Takashi Egawa; Makoto Miyoshi; Mohamed Henini is a Engineering article available to read on EtoBox.
What is Current-induced degradation behaviors of InGaN/GaN multiple quantum well UV photodetectors: Role of electrically active defects about?
To examine the critical role of electrically active defects and surface states in InGaN/GaN multiple quantum well (MQW) ultraviolet photodetectors (UV-PDs), the study of degradation mechanisms in such devices is very important. In this work, we have fabricated InGaN/GaN MQW UV-PDs with a thick passivation layer of Al2O3 and studied their degradation behaviors by applying high current stress. The origin of degradation processes has been investigated intensively by employing different combined optical and electrical measurements. As a consequence of stress, we noticed that (i) the electroluminescence intensity decreases distinctly (∼ 48 %), suggesting that more of the charge carriers are captured by the newly induced defects in the active region; (ii) the open circuit voltage is mostly accountable for the degradation of photovoltaic properties in treated PDs; (iii) the parasitic current leakage paths increase significantly which in turn reduce the photocurrent generation process largely; (iv) within the temperature range of 100–440 K, the values of the ideality factor and barrier height are found to be always higher and lower in treated PDs, respectively, indicating the presence of g
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- Author
- Pradip Dalapati; Abdulaziz Almalki; Sultan Alhassan; Saud Alotaibi; Maryam Al Huwayz; Taiki Nakabayashi; Takashi Egawa; Makoto Miyoshi; Mohamed Henini
- Publisher
- Elsevier BV
- Published
- 2022
- Language
- EN
- Field
- Engineering (Physical Sciences)