Reduced graphene oxide - based multilayer transparent conductive electrodes
Marcela Socol, Nicoleta Preda, Andreea Costas, Anca Stănculescu, Oana Rasoga, Ionel Stavarache, Gabriela Petre, Gianina Popescu‐Pelin, Luiza Izabela Toderascu, C. Breazu, G. Socol
Abstract
In this work, we investigated the influence of reduced graphene oxide (RGO) on the electrical performances of ZnO/Ag multilayer transparent conductive electrodes. RGO flakes were successfully laser transferred by matrix assisted pulsed laser evaporation (MAPLE) using frozen targets obtained from suspensions of commercially chemically RGO powder dispersed in dimethyl sulfoxide (DMSO). The main deposition parameters such as RGO concentration, laser fluence, number of the laser pulses and deposition pressure were varied to identify the optimal morphological and optical characteristics. The laser transfer conditions for the RGO structures with the best transmittance were further employed in preparation of RGO/Ag/ZnO multilayer transparent conductive electrodes (MTCE). Thus, the MAPLE deposited RGO structures were covered with metal (Ag) by vacuum thermal evaporation (VTE) and subsequently with metal oxide (ZnO) by radio frequency magnetron sputtering (RF-MS). In comparison to the optical and electrical properties of a ZnO/Ag/ZnO reference structure, the results emphasize that the RGO/Ag/ZnO are featured by a similar transmittance (∼82–85 %) and improved sheet resistance (∼10.6 Ω/□, meaning up to 2-fold smaller). • Reduced graphene oxide flakes deposited by matrix assisted pulsed laser evaporation. • Multilayer transparent conductive electrodes based on RGO/Ag/ZnO were prepared. • The RGO/Ag/ZnO electrodes are suitable for optoelectronic applications.