CC BY
13LD-PS-5
Optical properties of polymer semiconductor
V. Krasovskii1, S. Rasmagin1
1Prokhorov General Physics Institute- Russian Academy of Sciences, Laser physics, Moscow, Russian Federation
Currently, along with the use of inorganic semiconductors in microelectronics, organic semiconductors, such as the PEDOT - PSS copolymer, are being successfully developed and investigated [1]. In this work, we investigated the optical and electrophysical properties of a high-molecular-weight semiconductor polyvinyl chloride-polyacetylene (PVC-PAC) in order to create organic solar cells. PVC-PAC films prepared as a result of heat treatment of the initial PVC solution in acetophenone solvent at a temperature t = 195°C and different heating times were prepared [2]. The film thickness was 300 p,m. A study was conducted of the effect of the number of conjugated double bonds of carbon and the associated n-n* electronic transitions on the photoluminescence spectra and the resistivity of PVC-PAC. cm) decreases, and the peak of the photoluminescence spectra (SF) of the films shift to the long wavelength region. It was found that with an increase in the number of conjugated double bonds of carbon (an increase in heat treatment time), the resistivity of films to the semiconducting state (103-104 Q*cm) decreases, and the peak of the photoluminescence spectra of the films shift to the long wavelength region. The maximum SF peak shift was 70 nm. The length of the conjugation chain is determined by the number of conjugated double bonds of carbon. As the conjugation chain length increases (-CH= CH-)n in the range 3.3-4.5 nm, the photoluminescence emission quantum decreases from 2.3 to 2 eV, where n=5-7. Thus, it is possible to shift the peak of the photoluminescence spectrum by changing the length of the conjugation chain in the PVC-PAC polymer semiconductor.
This work was supported by Russan Foundation of Basic Research Grant No 18-02-00786 and Program of RAS presidium I.7P.
400 500 600 700 800 900
X, nm
Fig.1. Photoluminescence spectra: 1 - PVC-PAC film heat treatment 60 min; 2 - PVC-PAC film heat treatment 180
min; 3 - PVC-PAC film heat treatment 240 min.
The following results were obtained: by changing the number of conjugated carbon double bonds (the length of the conjugation chain), one can regulate the peak of the photoluminescence spectrum in the range of 537-607 nm and the specific resistance in the range 103-104 Q*cm. This work was supported by Russan Foundation of Basic Research Grant No 18-02-00786 and Program of RAS presidium I.7P.
References
[1] Nardes A. M., Kemerink M., Janssen R. A. J. Anisotropic hopping conduction in spin-coated PEDOT:PSS thin films, Physical review B76, 085208 (2007).
[2] Kryshtob V.I., Rasmagin S.I. Analysis of the properties of dehydrochlorinated polyvinyl chloride films, The Russian Journal of Applied Physics, 62 (11) 1689-1691 (2017).
