scholarly journals Modeling of diffusion motion of In nanoparticles in a CdTe crystal during laser-induced doping

2021 ◽  
Vol 22 (2) ◽  
pp. 301-306
Author(s):  
S.M. Levytskyi ◽  
T. Zhao ◽  
Z. Cao ◽  
A.V. Stronski
Keyword(s):  
Crystal Surface ◽  
Laser Pulses ◽  
Metal Electrode ◽  
Nanosecond Laser ◽  
Cdte Crystal ◽  
Thermal Evaporation Method ◽  
Crystal Sample ◽  
Diffusion Motion ◽  
Traveling Heater Method ◽  
P Type

In order to solve the problem of the ohmic contact between the crystal surface and the metal electrode in the manufacturing process of the X/γ-ray detector, this paper uses a laser to probe the doping process of In/CdTe crystals in different media. In this experiment, the Traveling Heater Method (THM) is used to obtain CdTe(111) crystals that meet the requirements (ρ >109Ω∙cm). In and Au materials are respectively coated on the surface of the crystal sample by the vacuum thermal evaporation method to obtain the crystal sample meeting the requirements. The high-resistance p-type CdTe crystal of a relatively thick In film is irradiated with nanosecond laser pulses, the In film is used as an n-type doping source and as an electrode after laser irradiation.

Photorefractive gratings formed in a Fe : CdTe crystal by nanosecond laser pulses

1998 ◽  
Vol 28 (1) ◽  
pp. 66-68
Author(s):  
A A Borshch ◽  
M S Brodin ◽  
V I Volkov ◽  
V I Rudenko
Keyword(s):  
Laser Pulses ◽  
Nanosecond Laser ◽  
Cdte Crystal ◽  
Nanosecond Laser Pulses

Laser-Induced Modification of Properties of CdZnTe Crystals

2015 ◽  
Vol 1117 ◽  
pp. 15-18 ◽  
Author(s):  
Volodymyr A. Gnatyuk ◽  
Oleksandr I. Vlasenko ◽  
Sergiy N. Levytskyi ◽  
Toru Aoki
Keyword(s):  
Crystal Surface ◽  
Structural Characteristics ◽  
Surface Region ◽  
Energy Shift ◽  
Laser Pulses ◽  
High Energy ◽  
Nanosecond Laser ◽  
Low Leakage ◽  
Low Leakage Current ◽  
Before And After

The photoconductivity (PC) spectra of CdZnTe (CZT) semiconductor solid solutions obtained from different manufacturers were investigated before and after irradiation with nanosecond laser pulses. Depending of energy density, irradiation of CZT crystals resulted in an increase in the photosensitivity, high-energy shift of the PC spectrum maximum and transformation of its profile. Laser processing with the certain energy densities improved homogeneity in the crystal surface area and provided equalization of structural characteristics in the surface region and bulk of the samples. Irradiation of CZT crystals pre-coated with an In electrode film caused rectification in the I-V characteristics because of the formation of a barrier structure. The application of the obtained In/CZT/Au diodes with low leakage current as X/γ-ray detectors is considered.

Formation of Periodical Sub-Micron Sized Structures on Silicon by Interfered Nanosecond Laser Pulses

2010 ◽  
Vol 97-101 ◽  
pp. 3803-3806
Author(s):  
Yong Xiang Hu ◽  
Heng Zhang ◽  
Zheng Qiang Yao
Keyword(s):  
Cost Effective ◽  
Laser Pulses ◽  
Laser Beams ◽  
Nanosecond Laser ◽  
Effective Technique ◽  
First Order ◽  
Direct Fabrication ◽  
Cost Effective Technique ◽  
Nanosecond Laser Pulses ◽  
Micro Structuring

Laser interference micro-structuring is a relatively efficient and cost-effective technique for fabricating periodical micro-nano-structuring surfaces. The direct fabrication of sub-micron sized dot array on silicon was performed by four interfering nanosecond laser beams with a diffractive beam splitter. The mechanism to form the dot array was analyzed and it was found that the obtained conical dot array had a negative shape of the interference pattern of four laser beams. A second-order peak between two first-order peaks also occurred due to the liquid-solid expansion.

scholarly journals Sputtering of Neutral Molecules and Molecular Ions From the Adenine Crystal Surface Induced by the UV Picosecond Laser Pulse

1982 ◽  
Vol 1 (1) ◽  
pp. 37-43 ◽  
Author(s):  
V. S. Antonov ◽  
V. S. Letokhov ◽  
Yu. A. Matveyets ◽  
A. N. Shibanov
Keyword(s):  
Laser Radiation ◽  
Kinetic Energy ◽  
Crystal Surface ◽  
Picosecond Laser ◽  
Laser Pulses ◽  
Molecular Ions ◽  
Laser Radiation Intensity ◽  
Ion Sputtering ◽  
Absorbed Energy ◽  
Picosecond Laser Pulse

This paper presents the results of observation of sputtering of neutral molecules and ions from the crystal adenine surface induced by fourth-harmonic Nd:YAG laser radiation with a pulse duration of 30 ps. The energy fluence of laser pulses was in the region (1–3) × 10−4 J/cm2. The kinetic energy distribution of the sputtered molecules spreads up to 0.7 eV. The experiment shows that the threshold of adenine molecular ion sputtering is connected with absorbed energy density in upper layers of the crystal surface but not by laser radiation intensity.

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