[en] Silver nanowire (AgNW) networks offer excellent electrical and optical properties and have emerged as one of the most attractive alternatives to transparent conductive oxides to be used in flexible optoelectronic applications. However, AgNW networks still suffer from chemical, thermal and electrical instabilities which in some cases can hinder their efficient integration as transparent electrodes in devices such as solar cells, transparent heaters, touch screens or organic light emitting diodes (OLEDs). We have used atmospheric pressure spatial atomic layer deposition (AP-SALD) to fabricate hybrid transparent electrode materials in which the AgNW network is protected by a conformal thin zinc oxide layer. The choice of AP-SALD allows to maintain the low-cost and scalable processing of AgNW based transparent electrodes. The effects of the ZnO coating thickness on the physical properties of AgNW networks are presented. The composite electrodes show a drastic enhancement of both thermal and electrical stabilities. We found that bare AgNWs were stable only up to 300 °C when subjected to thermal ramps while the ZnO coating improved stability up to 500 °C. Similarly, ZnO coated AgNWs exhibited an increase of a 100 % in electrical stability with respect to bare networks, withstanding up to 18 V. A simple physical model shows that the origin of the stability improvement is the result of hindered silver atomic diffusion thanks to the presence of the thin oxide layer and the quality of the interfaces of hybrid electrodes. The effects of ZnO coating on both the network adhesion and optical transparency are also discussed. Finally, we show that the AP-SALD ZnO-coated AgNW networks can be effectively used as very stable transparent heaters.
Research center :
CESAM - Complex and Entangled Systems from Atoms to Materials - ULiège
Disciplines :
Physics
Author, co-author :
Khan, Afzal; Université de Grenoble Alpes > Laboratoire des Matériaux et du Génie Physique
Nguyen, Viet Huong; Université de Grenoble Alpes > Laboratoire des Matériaux et du Génie Physique
Munoz-Rojas, David; Université de Grenoble Alpes > Laboratoire des Matériaux et du Génie Physique
Aghazadehchors, Sara ; Université de Liège - ULiège > Form. doct. sc. (phys. - Paysage)
Jimenez, Carmen; Université de Grenoble Alpes > Laboratoire des Matériaux et du Génie Physique
Nguyen, Ngoc Duy ; Université de Liège - ULiège > Département de physique > Physique des solides, interfaces et nanostructures
Bellet, Daniel; Université de Grenoble Alpes > Laboratoire des Matériaux et du Génie Physique
Language :
English
Title :
Stability enhancement of silver nanowire networks with conformal ZnO coatings deposited by atmospheric pressure spatial atomic layer deposition
Publication date :
2018
Journal title :
ACS Applied Materials and Interfaces
ISSN :
1944-8244
eISSN :
1944-8252
Publisher :
American Chemical Society, United States - District of Columbia
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