Incubation and nanostructure formation on n- and p-type Si(1 0 0) and Si(1 1 1) at various doping levels induced by sub-nanojoule femto- and picosecond near-infrared laser pulses
Incubation and nanostructure formation on n- and p-type Si(1 0 0) and Si(1 1 1) at various doping levels induced by sub-nanojoule femto- and picosecond near-infrared laser pulses
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亚纳焦飞秒和皮秒近红外激光脉冲诱导不同掺杂浓度的 n 型和 p 型 Si(1 0 0) 和 Si(1 1 1) 上的孵化和纳米结构形成
DOI:
10.1016/j.apsusc.2014.06.140
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发表时间:
2014
影响因子:
6.7
通讯作者:
M. Straub
中科院分区:
文献类型:
--
作者:
M. Schüle;M. Afshar;D. Feili;H. Seidel;K. König;M. Straub
N- and p-doped Si(1 0 0) and Si(1 1 1) surfaces with dopant concentrations of 2 × 1014–1 × 1019cm−3were irradiated by tightly focused 85-MHz repetition rate Ti:sapphire laser light (central wavelength 800 nm, bandwidth 120 nm) at pulse durations of 12 fs to 1.6 ps. Dependent on pulse peak intensity and exposure time nanorifts, ripples of period 130 nm as well as sponge-like randomly nanoporous surface structures were generated with water immersion and, thereafter, laid bare by etching off aggregated oxide nanoparticles. The same structure types emerged in air or water with transform-limited 100-fs pulses. At a pulse length of 12 fs pronounced incubation occurred with incubation coefficientsS= 0.66–0.85, whereas incubation was diminished for picosecond pulses (S> 0.95). The ablation threshold strongly rose with dopant concentration. At similar doping level it was higher for n-type than for p-type samples and for Si(1 0 0) compared to Si(1 1 1) surfaces. These observations are attributed to laser-induced defect states in the bandgap which participate in photoexcitation, deactivation of dopants by complex formation, and different densities of interface states at the boundary with the ultrathin native silicon dioxide surface layer. The threshold increase with pulse length revealed predominant single-photon excitation as well as multiphoton absorption.
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DOI:
--
发表时间:
1994
期刊:
影响因子:
--
作者:
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通讯作者:
H. Löhneysen
DOI:
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发表时间:
2005
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作者:
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通讯作者:
J. Kanasaki
影响因子:
3.2
作者:
M. Straub;M. Afshar;D. Feili;H. Seidel;K. König
通讯作者:
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DOI:
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发表时间:
2009
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作者:
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通讯作者:
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DOI:
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发表时间:
1977
期刊:
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--
作者:
Y. Cheng
通讯作者:
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