Aerosol flow homogenization in the spray polyphenylene vinylene thin film deposition

18th International Summer School on Vacuum, Electron and Ion Technologies

Milenkov, V.^1 ; Honova, J.^1 ; Zhivkov, I.^1,2 ; Yordanov, R.^3 ; Vala, M.^1 ; Mladenova, D.^1,2 ; Weiter, M.^1

Faculty of Chemistry, Center for Materials Research, Brno University of Technology, 118 Purkynova, 612 00 Brno, Czech Republic^1

Acad. J. Malinowski Institute of Optical Materials and Technologies, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 109, 1113 Sofia, Bulgaria^2

Faculty of Electronic Engineering and Technologies, Department of Microelectronics, Technical University of Sofia, 8 Kl. Ochridski Blvd., 1756 Sofia, Bulgaria^3

关键词: IV characteristics;    Optical micrographs;    Orders of magnitude;    Photovoltaic applications;    Photovoltaic conversion;    Spectral dependences;    Thin-film depositions;    Toluene solution;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/514/1/012006/pdf
DOI  :  10.1088/1742-6596/514/1/012006

来源: IOP

【 摘 要 】

Two different spray deposition (SD) techniques-SD and homogenized SD (h-SD), were compared in the case of poly[2-methoxy-5-(3,7-dimethyloctyloxy)-1, 4-phenylene vinylene] (MDMO-PPV) used as a model material. The h-SD setup includes a homogenizer (a chamber) for homogenization of the spray flow. The homogenizer allows droplet size control and spraying at a low air pressure. Films of about thickness were prepared by SD and h-SD from a toluene solution with a concentration of 0.5 g l-1. Optical micrograph images show that using h-SD results in obtaining uniform films without a distinguishable structure. Imaging by polarized light reveals the typical discs observed often in the spray deposition experiments. The spectral dependence of the photocurrent consists of two peaks. This property makes the structures with h-SD films more attractive for a photovoltaic application since this enhances the photovoltaic conversion in a wider visible light range. The I-V characteristics measured on samples with h-SD films show that exposure to white light increases the current by two orders of magnitude. One can thus conclude that the ITO|MDMO-PPV|Al structures with h-SD MDMO-PPV films behave as a photovoltaic cell.