Journal
NANOTECHNOLOGY
Volume 28, Issue 34, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-6528/aa7ba0
Keywords
silver nanowires; work function; transparent conductive electrode; OLED
Funding
- Global Leading Technology Program of the Office of Strategic R&D Planning (OSP) - Ministry of Knowledge Economy, Republic of Korea [10042537]
- National Research Council of Science & Technology (NST) - the Korea government (MSIP) [CAP-15-04KITECH]
- National Research Council of Science & Technology (NST), Republic of Korea [CAP-15-04-KITECH] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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This study proposes a simple method of Au coating on silver nanowires (Ag NWs) transparent conductive films as the anode of organic light emitting diodes (OLED) to increase the work function of the film and thus enhance hole transport. We carefully engineer the process conditions (pretreatment, solution concentrations, and coating number) of the coating using a diluted HAuCl4 solution on the Ag NWs film to minimize etching damage on Ag NWs accompanying the galvanic replacement reaction. Ultraviolet photoelectron spectroscopy and Kelvin probe force microscopy show work function increase of Ag NWs upon Au coating. OLED devices based on Au-coated Ag NWs show a lower turn-on voltage and higher luminance, compared with pristine Ag NWs device. Although the Ag NWs device displays poor efficiencies in the low luminance range due to a high leakage, some of the Au-coated Ag NWs devices showed efficiencies higher than those of the ITO device in a high luminance.
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