Jump to main content
Jump to site search
PLANNED MAINTENANCE Close the message box

Scheduled maintenance work on Wednesday 27th March 2019 from 11:00 AM to 1:00 PM (GMT).

During this time our website performance may be temporarily affected. We apologise for any inconvenience this might cause and thank you for your patience.


Issue 22, 2016
Previous Article Next Article

Reduced leakage current and improved performance of an organic photodetector using an ytterbium cathode interlayer

Author affiliations

Abstract

We report the electron transport and hole-blocking properties of ytterbium, which make it suitable for use as the cathode interlayer for the poly(3-hexylthiophene-2,5-diyl) (P3HT):phenyl-C61-butyric acid methyl ester (PCBM) bulk heterojunction in organic photodetectors (OPDs). The final device structure consisting of ITO/NiOx/P3HT:PC60BM/Yb/Al is compared to devices with Ca as the cathode interlayer and without a cathode interlayer. The performance of OPDs is analyzed, and effective carrier extraction and hole blocking are confirmed through the dynamic characteristics of the devices. The use of a Yb layer in the OPDs improves the resistance, thereby improving the carrier extraction and decreasing the leakage current significantly. A figure of merit for the dynamic characteristics, namely the bandwidth of Yb, is improved owing to the fast response time. The bandwidth exceeds 100 kHz at a relatively low light intensity. Optical–electrical measurements are performed, and JV characteristics, impedance, and dynamic characteristics are analyzed. We investigate the effects of the Yb layer on the performance of the OPDs, focusing on its carrier extraction, leakage current, and resistance components.

Graphical abstract: Reduced leakage current and improved performance of an organic photodetector using an ytterbium cathode interlayer

Back to tab navigation

Supplementary files

Publication details

The article was received on 27 Jan 2016, accepted on 06 Apr 2016 and first published on 11 Apr 2016


Article type: Paper
DOI: 10.1039/C6TC00415F
Citation: J. Mater. Chem. C, 2016,4, 4920-4926

  •   Request permissions

    Reduced leakage current and improved performance of an organic photodetector using an ytterbium cathode interlayer

    S. B. Lim, C. H. Ji, I. S. Oh and S. Y. Oh, J. Mater. Chem. C, 2016, 4, 4920
    DOI: 10.1039/C6TC00415F

Search articles by author

Spotlight

Advertisements