Crystal Orientation Dynamics of Collective Zn dots before Preferential Nucleation

Chun Chu Liu, Jun Han Huang, Ching Shun Ku, Shang Jui Chiu, Jay Ghatak, Sanjaya Brahma, Chung Wei Liu, Chuan Pu Liu, Kuang Yao Lo

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The island nucleation in the context of heterogeneous thin film growth is often complicated by the growth kinetics involved in the subsequent thermodynamics. We show how the evolution of sputtered Zn island nucleation on Si(111) by magnetron sputtering in a large area can be completely understood as a model system by combining reflective second harmonic generation (RSHG), a 2D pole figure with synchrotron X-ray diffraction. Zn dots are then oxidized on the surfaces when exposed to the atmosphere as Zn/ZnO dots. Derived from the RSHG patterns of Zn dots at different growth times, the Zn dots grow following a unique transition from kinetic to thermodynamic control. Under kinetic-favoring growth, tiny Zn dots prefer arranging themselves with a tilted c-axis to the Si(111) substrate toward any of the sixfold in-plane Si<110> directions. Upon growth, the Zn dots subsequently evolve themselves to a metastable state with a smaller tilting angle toward selective <110> directions. As the Zn dots grow over a critical size, they become most thermodynamically stable with the c-axis vertical to the Si(111) substrate. For a system with large lattice mismatch, small volume dots take kinetic pathways with insignificant deviations in energy barriers.

Original languageEnglish
Article number12533
JournalScientific reports
Volume5
DOIs
Publication statusPublished - 2015 Jul 27

All Science Journal Classification (ASJC) codes

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