Light emission enhancement from ZnO nanostructured films grown on Gr/SiC substrates. (April 2016)

• Record Type: Journal Article
• Authors: Khranovskyy, V.; Shtepliuk, I.; Ivanov, I.G.; Tsiaoussis, I.; Yakimova, R.
• Is Part Of: Carbon. Volume 99(2016)
• Page Start: 295
• Page End: 301
• Publication Date: 2016-04
• Subjects: Carbon -- Periodicals; Carbone -- Périodiques; Koolstof; Toepassingen; Electronic journals; 546.681
• DOI: 10.1016/j.carbon.2015.12.010
• Languages: English
• ISSNs: 0008-6223

Abstract

Abstract: We report on the application of a single layer graphene substrates for the growth of polycrystalline ZnO films with advanced light emission properties. Unusually high ultraviolet (UV) and visible (VIS) photoluminesce was observed from the ZnO/Gr/SiC structures in comparison to identical samples without graphene. The photoluminescence intensity depends non-monotonically on the films thickness, reaching its maximum for 150 nm thick films. The phenomena observed is explained as due to the dual graphene role: i) the dangling bond free substrate, providing growth of relaxed thin ZnO layers ii) a back reflector active mirror of the Fabry-Perot cavity that is formed. The reported results demonstrate the potential of two-dimensional carbon materials integration with light emitting wide band gap semiconductors and can be of practical importance for the design of future optoelectronic devices.