UPM Institutional Repository

Johnson noise and optical characteristics of polymer nanocomposites based on colloidal quantum dots and in-situ nanoparticles formation


Naning @ Zin, Fatin Hana and Malik, Syed Abdul and Koo, Lee Feng and Wong, Tze Jin and Yiu, Pang Hung (2020) Johnson noise and optical characteristics of polymer nanocomposites based on colloidal quantum dots and in-situ nanoparticles formation. Advances in Science, Technology and Engineering Systems, 5 (5). 750 - 756. ISSN 2415-6698


Electrical and optical properties of polymer nanocomposite thin films have been analyzed to study their reliability and competency as a component for optoelectronic devices such as LED and solar cells. Polymer nanocomposite encounters various challenges, such as the dispersion of nanoparticles in the matrix that hinders their efficiency for potential devices. In this paper, two types of polymer nanocomposites have been fabricated, and their Johnson noise, current density-voltage, and optical have been measured. The first type of nanocomposite produced through an in-situ method, that is by impregnating CdS or CdSe nanoparticles in conjugated polymer, P3HT (NP-CdX:P3HT). The nucleation of the nanoparticles was done using gas exposure. The second type is by directly adding CdS or CdSe quantum dots into P3HT (QD-CdX:P3HT). Both kinds of polymer nanocomposite thin films were fabricated using modified Langmuir-Blodgett technique. Results showed that for frequency above 10 Hz, the Johnson noise was less than 1× 10-27 A2/Hz, regardless of the quantity of quantum dots or nanoparticles. The J-V results show (NP-CdX:P3HT) electrical performance compared with QD-CdX:P3HT. High polymer crystallization of NP-CdX:P3HT thin films is revealed by UV-Vis absorbance spectra. The quantum confinement effect is evidence through peak shifting and depreciation of absorption. The photoluminescence intensity of thin films decreased when they were exposed to the gas. It can be concluded that the NP-CdX:P3HT nanocomposites can be further studied as they have greater potential to be exploited in optoelectronic devices.

Download File

[img] Text
Johnson noise.pdf

Download (8kB)
Official URL or Download Paper: https://astesj.com/v05/i05/p91/

Additional Metadata

Item Type: Article
Divisions: Faculty of Agriculture and Food Sciences
DOI Number: https://doi.org/10.25046/aj050591
Publisher: ASTES Publishers
Keywords: Johnson noise; Polymer nanocomposite; Cadmium sulfide
Depositing User: Ms. Nuraida Ibrahim
Date Deposited: 16 Aug 2021 22:52
Last Modified: 16 Aug 2021 22:52
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.25046/aj050591
URI: http://psasir.upm.edu.my/id/eprint/89495
Statistic Details: View Download Statistic

Actions (login required)

View Item View Item