Effect of the surface-plasmon–exciton coupling and charge transfer process on the photoluminescence of metal–semiconductor nanostructures

Autor:	Changqing Chen, Yanyan Fang, Jing Li, Jun Yin, Yashu Zang, Chuang Yue, Jinchai Li, Hao-Chung Kuo, Zhihao Wu, Ching Hsueh Chiu
Rok vydání:	2013
Předmět:	Materials science Photoluminescence Nanostructure business.industry Exciton Surface plasmon Nanoparticle Nanotechnology engineering.material Coupling (electronics) Coating engineering Optoelectronics General Materials Science Nanorod business
Zdroj:	Nanoscale. 5:4436
ISSN:	2040-3372 2040-3364
DOI:	10.1039/c3nr00920c
Popis:	The effect of direct metal coating on the photoluminescence (PL) properties of ZnO nanorods (NRs) has been investigated in detail in this work. The direct coating of Ag nanoparticles (NPs) induces remarkable enhancement of the surface exciton (SX) emissions from the ZnO NRs. Meanwhile, the charge transfer process between ZnO and Ag also leads to notable increment of blue and violet emissions from Zn interstitial defects. A thin SiO2 blocking layer inserted between the ZnO and Ag has been demonstrated to be able to efficiently suppress the defect emission enhancement caused by the direct contact of metal-semiconductor, without weakening the surface-plasmon-exciton coupling effect. A theoretical model considering the type of contacts formed between metals, ZnO and blocking layer is proposed to interpret the change of the PL spectra.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0478fdcc367f2f09db2fc7e1fc59bff6 https://doi.org/10.1039/c3nr00920c Zobrazit plný text záznamu