Photoelectrical characterization of a new low molecular weight compound

18th International School on Condensed Matter Physics: "Challenges of Nanoscale Science: Theory, Materials, Applications"

Siderov, V.^1 ; Dobrikov, G.H.^2 ; Zhivkov, I.^1,3 ; Dobrikov, G.M.^4 ; Georgiev, Y.^2 ; Yordanov, R.^2 ; Honova, J.^1 ; Weiter, M.^1

Faculty of Chemistry, Centre for Materials Research, Brno University of Technology, Purkynova 118, Brno

612 00, Czech Republic^1

Faculty of Electronic Engineering and Technologies, Department of Microelectronics, Technical University of Sofia, Kl. Ochridski Blvd. 8, Sofia

1756, Bulgaria^2

Institute of Optical Materials and Technologies Acad. J. Malinowski, Bulgarian Academy of Sciences, Acad. G. Bonchev Str. bl. 101/109, Sofia

1113, Bulgaria^3

Institute of Organic Chemistry with Center of Phytochemistry, Bulgarian Academy of Sciences, Acad. G. Bonchev Str. 9, Sofia

1113, Bulgaria^4

关键词: Charge carrier photogeneration;    Charge carrier recombination;    Chemical formulae;    Dark current-voltage;    Low molecular weight compounds;    Photovoltaic parameters;    Series resistances;    Spectral dependences;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/558/1/012064/pdf
DOI  :  10.1088/1742-6596/558/1/012064

来源: IOP

【 摘 要 】

Photoelectrical characterization of a newly synthesized low molecular weight compound was carried out. 1,8-naphtalimide (chemical formula C32H34N4O5S) was originally synthesized and analyzed by NMR spectroscopy. Thin films were deposited in vacuum on commercially pre-patterned ITO covered glass substrates and the samples were prepared in clean room environment. The films deposited were characterized by SEM. Photoelectrical characteristics of the samples prepared were estimated by dark current-voltage measurement, spectral dependence of the photoconductivity and measurement under exposure with light, produced by solar simulator. Finally electroluminescence measurements were performed. It was found that the samples exhibit diode behaviour. The low values characterizing photovoltaic parameters obtained could be connected with the relative higher series resistance (Rseries). The predominant influence of Rseriesis assumed as the relative high photoluminescence, measured from solution should be related to a relatively strong charge carrier photogeneration. This result is supported by electroluminescent measurement. Another reason for the low values of the photovoltaic parameters measured could be the non-optimized film thickness leading to a non-optimal light absorption and increased charge carrier recombination. The assumption for the predominant influence of Rseriesis supported by the electroluminescent measurements.