Effect of donor on the performance of self-powered UV photodiodes based on solution-processed TPD:Alq3 and NPD:Alq3 active layers

Mahmoud, Alaa Y. and Sulaiman, Khaulah and Bahabry, Rabab R. and Alzahrani, Hanan (2021) Effect of donor on the performance of self-powered UV photodiodes based on solution-processed TPD:Alq3 and NPD:Alq3 active layers. Optik, 244. ISSN 0030-4026, DOI https://doi.org/10.1016/j.ijleo.2021.167538.

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Abstract

In this work, the impact of donor material on the optical and photodiode response is revealed by comparing the performance of self-powered photodiodes based on D:Alq3 (D=TPD or NPD) composite. The active layers were fabricated from solution-processed composites using the wellknown spin coating technique, followed by their optical and electrical characterizations. The photodiodes were utilized for the UV light detection in a self-powered mode, in which no external power is required, but it is generated through the photovoltaic effect. Results showed that the NPD film has provided a broader and more intensive optical absorption towards the UV light compared to that of TPD. Also, photoluminescence quenching in the NPD:Alq3 composite was found to highly outperform that of the TPD:Alq3. These were ascribed to the effect of extra pi conjugated bonds present in the NPD, which are originated from the aromatic rings. Consequently, the NPD:Alq3 photodiodes presented a respective sensitivity, responsivity and detectivity of 1.3x105, 1.07 mA/W and 5.25x1011 Jones at 0 V. Moreover, the response (0.34 s) and recovery time (0.28 s) of these devices were found to be smaller compared to those reported in literature.

Item Type: Article
Funders: UNSPECIFIED
Uncontrolled Keywords: Photodiode; Self-powered; Sensitivity; Detectivity
Subjects: Q Science > QC Physics
Divisions: Faculty of Science > Department of Physics
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 28 Feb 2022 06:29
Last Modified: 28 Feb 2022 06:29
URI: http://eprints.um.edu.my/id/eprint/26415

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