tailieunhanh - Báo cáo hóa học: " Cohesive strength of nanocrystalline ZnO:Ga thin films deposited at room temperature"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Cohesive strength of nanocrystalline ZnO:Ga thin films deposited at room temperature | Samantilleke et al. Nanoscale Research Letters 2011 6 309 http content 6 1 309 o Nanoscale Research Letters a SpringerOpen Journal NANO REVIEW Open Access Cohesive strength of nanocrystalline ZnO Ga thin films deposited at room temperature Anura Priyajith Samantilleke1 Luis Manuel Fernandes Rebouta1 Vitor Garim1 Luis Rubio-Pena2 Senetxu Lanceros-Mendez1 Pedro Alpuim1 Sandra Carvalho1 Alexey V Kudrin3 and Yury A Danilov3 Abstract In this study transparent conducting nanocrystalline ZnO Ga GZO films were deposited by dc magnetron sputtering at room temperature on polymers and glass for comparison . Electrical resistivities of X 10-4 and X 10-3 Q cm were obtained for films deposited on glass and polymers respectively. The crack onset strain COS and the cohesive strength of the coatings were investigated by means of tensile testing. The COS is similar for different GZO coatings and occurs for nominal strains approx. 1 . The cohesive strength of coatings which was evaluated from the initial part of the crack density evolution was found to be between and GPa. For these calculations a Young s modulus of 112 GPa was used evaluated by nanoindentation. Introduction Doped ZnO thin films are widely used as transparent electrodes in optoelectronic and electro-optic devices such as solar cells and flat panel displays 1-3 because of their unique properties specifically low electrical resistivity and high transmittance in the visible spectral region 4 . These properties are obtained using substrate temperatures higher than 200 C but growing interest in flexible substrates has led to the use of polymeric alternatives which require the deposition of films at low temperature 5 . Furthermore the deposition on polymeric substrates decreases the quality of the film properties 6 therefore the pursuit toward an understanding of the structural electromechanical and electro-optical properties of nanocrystalline nc thin films is crucial for device .