Fabricación y estudio de películas delgadas conductoras y transparentes de nano-hilos metálicos preparadas por spin coating

Abstract

Transparent conductive thin films on glass substrates from metal nano-wires were produced by the spin coating method by varying the speed of rotation between 1000 and 9000 RPM. Morphological and structural properties of the deposited layers were studied by Scanning Electron Microscopy (SEM). The electrical and optical properties were studied as a function of layer thickness by the Van Der Paw method and transmittance measurements in the range between 350 and 800 nm. A correlation between the thickness of the deposited layers and their electrical and optical properties is obtained, showing less sheet resistance to larger thickness while its transmittance decreases. Samples with sheet resistance of about 20 Ω/sq and with average 77% light transmittance at 550 nm were obtained. Keywords: Metal nano-wire, spin-coating, thin films, transparent conductors. ResumenSe fabricaron películas delgadas conductoras y transparentes sobre sustratos de vidrio a partir de nano-hilos metálicos por el método spin coating, variando la velocidad de rotación entre 1000 y 9000 revoluciones por minuto. De las capas depositadas se hizo un estudio de sus propiedades morfológicas y estructurales mediante microscopía electrónica de barrido (SEM). Las propiedades eléctricas y ópticas se estudiaron en función del espesor de las capas mediante el método de Van Der Paw y con medidas de transmitancia en el rango entre 350 y 800 nm. Se encuentra una correlación entre el espesor de las capas depositadas y sus propiedades eléctricas y ópticas, presentando menor resistencia de hoja a mayores espesores a la vez que su transmitancia disminuye. Se obtuvieron muestras con resistencia de hoja alrededor de 20 Ω/sq y transmitancia óptica promedio de 77% a 550 nm.

High Aspect Ratio and Post-Processing Free Silver Nanowires as Top Electrodes for Inverted-Structured Photodiodes

“…23,25,26,28,29 Besides that, the processing of Ag NW electrodes is cost-effective because Ag NWs can be processed in solution. 22,27,32,33,35…”

“…The device performances can be enhanced by using a transparent metal conducting material as the top electrode. Among transparent metal conducting materials available, silver NWs (Ag NWs) are widely used as transparent conducting bottom electrodes because of their highest electrical conductivity and ease in synthesizing ,− Ag NWs have been reported to be used in many applications such as organic light-emitting diodes (OLEDs), polymer LEDs, touch screens, solar cells, and transparent heaters. − , This is because Ag NW electrodes are exceptional in terms of transparency, conductivity, and flexibility and suitable to be applied in optoelectronic devices. ,,,, Besides that, the processing of Ag NW electrodes is cost-effective because Ag NWs can be processed in solution. ,,,, …”

“…23,25,26,28,29 Besides that, the processing of Ag NW electrodes is cost-effective because Ag NWs can be processed in solution. 22,27,32,33,35 Several studies have reported the application of Ag NWs as top electrodes but their Ag NWs mostly consist of a polyvinylpyrrolidone (PVP) layer. 35−40 Typically, post-processing procedures such as high temperature annealing, chemical annealing, light annealing, and tedious purification processes are required to remove the PVP layer in order to improve the conductivity and connectivity of the Ag NW network.…”