Reducing the quantum confined Stark effect through unidirectional graded quantum well for high luminescence intensity 280-nm deep-ultraviolet light-emitting diode

• Main Authors: Hairol Aman, Mohammad Amirul, Ahmad Fajri, Faris Azim, Ahmad Noorden, Ahmad Fakhrurrazi, Abdul Aziz, Azni, Danial, Wan Hazman, Abdul Kadir@Jaafar, Muhammad Zamzuri
• Format: Article
• Language: English
• Published: Institut Fizik Malaysia 2024
• Subjects: QC Physics
• Online Access: http://irep.iium.edu.my/114345/7/114345_%20Reducing%20the%20quantum%20confined%20stark%20effect%20through%20unidirectional.pdf; http://irep.iium.edu.my/114345/; https://jfm.ifm.org.my/vol_iss/20

Research on Deep-ultraviolet light-emitting diode (DUV-LED) has become prominent recently due to the demand for purifying and disinfecting the COVID-19 virus in the 2021 pandemic. Unfortunately, the performance of the DUV-LED has been hindered by the Quantum Confined Stark Effect (QCSE) which reduces the recombination of electrons and holes in the quantum wells, thus deteriorating the luminescence intensity. In this research, two epi-structures with different types of quantum wells grading have been investigated and compared with the conventional quantum wells. The analysis covers several important optoelectronics properties such as the band diagram, carrier concentration, electric field, wavefunction of the carrier and luminescence spectrum. It is found that one of the graded quantum wells provides 31% enhancements for luminescence intensity relative to the conventional quantum well and the emission wavelength shifted around 1 nm only.