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Proceedings Paper

Laser processing and in-situ diagnostics for crystallization: from thin films to nanostructures
Author(s): Jae-Hyuck Yoo; Jung Bin In; Andy Cheng Zheng; Sang-Gil Ryu; David J. Hwang; Bin Xiang; Andrew M. Minor; Costas P. Grigoropoulos
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Paper Abstract

Recent work on laser-induced crystallization of thin films and nanostructures is presented. Characterization of the morphology of the crystallized area reveals the optimum conditions for sequential lateral growth in a-Si thin films under high-pulsed laser irradiation. Silicon crystal grains of several micrometers in lateral dimensions can be obtained reproducibly. Laser-induced grain morphology change is observed in silicon nanopillars under a transmission electron microscopy (TEM) environment. The TEM is coupled with a near-field scanning optical microscopy (NSOM) pulsed laser processing system. This combination enables immediate scrutiny on the grain morphologies that the pulsed laser irradiation produces. The tip of the amorphous or polycrystalline silicon pillar is transformed into a single crystalline domain via melt-mediated crystallization. The microscopic observation provides a fundamental basis for laser-induced conversion of amorphous nanostructures into coarse-grained crystals. A laser beam shaping strategy is introduced to control the stochastic dewetting of ultrathin silicon film on a foreign substrate under thermal stimulation. Upon a single pulse irradiation of the shaped laser beam, the thermodynamically unstable ultrathin silicon film is dewetted from the glass substrate and transformed to a nanodome. The results suggest that the laser beam shaping strategy for the thermocapillary-induced de-wetting combined with the isotropic etching is a simple alternative for scalable manufacturing of array of nanostructures.

Paper Details

Date Published: 8 October 2014
PDF: 11 pages
Proc. SPIE 9180, Laser Processing and Fabrication for Solar, Displays, and Optoelectronic Devices III, 91800D (8 October 2014); doi: 10.1117/12.2064278
Show Author Affiliations
Jae-Hyuck Yoo, Univ. of California, Berkeley (United States)
Jung Bin In, Univ. of California, Berkeley (United States)
Korea Institute of Machinery and Materials (Korea, Republic of)
Andy Cheng Zheng, Univ. of California, Berkeley (United States)
Sang-Gil Ryu, Univ. of California, Berkeley (United States)
David J. Hwang, Stony Brook Univ. (United States)
Bin Xiang, Univ. of California, Berkeley (United States)
Univ. of Science and Technology of China (China)
Andrew M. Minor, Univ. of California, Berkeley (United States)
Costas P. Grigoropoulos, Univ. of California, Berkeley (United States)


Published in SPIE Proceedings Vol. 9180:
Laser Processing and Fabrication for Solar, Displays, and Optoelectronic Devices III
Edward W. Reutzel, Editor(s)

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