Ultrafast laser heating for controlling the optoelectronic properties of sulfur hyperdoped black silicon

材料科学 光电子学 激光器 黑硅 超短脉冲 退火(玻璃) 带隙 光学 复合材料 物理
作者
Patrick Mc Kearney,Sören Schäfer,Simon Paulus,Michael Roser,Fabian Piermaier,Ingo Lebershausen,Stefan Kontermann
出处
期刊:Journal of Applied Physics [American Institute of Physics]
卷期号:133 (1) 被引量:6
标识
DOI:10.1063/5.0130743
摘要

Ultrashort pulse laser processed sulfur hyperdoped black silicon represents a promising silicon-based material for infrared optoelectronic applications due to its high sub-bandgap optical absorptance. Non-thermal melting and resolidification processes associated with such laser processing, however, result in amorphous and polycrystalline phases which may be detrimental for this purpose. Furthermore, the sulfur impurities are electrically inactive, impeding the formation of a rectifying junction. This work demonstrates an ultrafast laser heating process based on heat accumulation with laser pulses of 10 ps pulse duration at high repetition rates of 41 MHz and peak fluences between 33% and 66% of the ablation threshold as a method to (i) recrystallize the material and (ii) electrically activate the sulfur dopants while (iii) maintaining the sub-bandgap absorption. Furthermore, laser heating recovers the optical activity of sulfur states that have been previously deactivated by thermal annealing. The demonstrated process can have versatile applications in material functionalization due to its highly localized heat input accompanied by high cooling rates.
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