Photoelectric response in sandwich structures based on condensed layers of Ag2S quantum dots passivated with thioglycolic acid

Vladimir S. Gurchenko; Alim S. Mazinov; Mikhail S. Smirnov; Irina G. Grevtseva; Lolita P. Nesterenko; Oleg V. Ovchinnikov

doi:10.17308/kcmf.2023.25/11100

Vladimir S. Gurchenko V. I. Vernadsky Crimean Federal University, 4 prospekt Vernadskogo, Simferopol 295007, Republic of Crimea, Russian Federation https://orcid.org/0000-0002-8270-3820
Alim S. Mazinov V. I. Vernadsky Crimean Federal University, 4 prospekt Vernadskogo, Simferopol 295007, Republic of Crimea, Russian Federation https://orcid.org/0000-0003-0834-2390
Mikhail S. Smirnov Voronezh State University, 1 Universitetskaya pl., Voronezh, 394018, Russian Federation https://orcid.org/0000-0001-8765-0986
Irina G. Grevtseva Voronezh State University, 1 Universitetskaya pl., Voronezh 394018, Russian Federation https://orcid.org/0000-0002-1964-1233
Lolita P. Nesterenko Voronezh State University, 1 Universitetskaya pl., Voronezh 394018, Russian Federation
Oleg V. Ovchinnikov Voronezh State University, 1 Universitetskaya pl., Voronezh 394018, Russian Federation https://orcid.org/0000-0001-6032-9295

DOI: https://doi.org/10.17308/kcmf.2023.25/11100

Keywords: Silver sulfide, Activation energy, Charge carrier mobility, Conduction mechanisms, Schottky barrier

Abstract

The study is aimed at developing a technique for forming a structure with a Schottky barrier in the form of a mltilayer Al-Ag₂S-ITO sandwich structure, which includes a condensate of colloidal Ag₂S quantum dots passivated with thioglycolic acid molecules (Ag₂S/TGA QDs).
The spectral properties were studied using a USB2000+ spectrometer (Ocean Optics, USA) with a USB-DT light source (Ocean Optics, USA). Electrophysical and photoelectric properties of the structures were studied using a Keysight B1500A semiconductor device analyzer (Keysight tech, USA). The study of the temperature dependences of the properties in the temperature range from 300 to 360 K was carried out in a Shielded room (Faraday cage) placed in a muffle furnace. It was found that the conductivity of the Al-Ag₂S-ITO structure is mostly governed by the Schottky barrier at the Al-condensed Ag₂S QDs film junction.
At the junction between the condensed Ag₂S QDs film and Al, signs of the formation of a rectifying contact were found.
Under the action of the optical radiation with a wavelength of 650 nm and less, which corresponds to the most probable exciton transition in the UV-Vis absorption of Ag₂S/TGA QDs, an increase in the current was found for the negative branch of the J-V curve.

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Author Biographies

Vladimir S. Gurchenko, V. I. Vernadsky Crimean Federal University, 4 prospekt Vernadskogo, Simferopol 295007, Republic of Crimea, Russian Federation

postgraduate student of the
Department of Radiophysics and Electronics, Institute
of Physics and Technology, V. I. Vernadsky Crimean
Federal University (Simferopol, Republic of Crimea,
Russian Federation).

Alim S. Mazinov, V. I. Vernadsky Crimean Federal University, 4 prospekt Vernadskogo, Simferopol 295007, Republic of Crimea, Russian Federation

Dr. Sci. (Phys.–Math.)., Associate
Professor, Head of the Department of Radiophysics
and Electronics, Institute of Physics and Technology,
V. I. Vernadsky Crimean Federal University (Simferopol,
Republic of Crimea, Russian Federation).

Mikhail S. Smirnov, Voronezh State University, 1 Universitetskaya pl., Voronezh, 394018, Russian Federation

Dr. Sci. (Phys.–Math.).,
Associate Professor, Department of Optics and
Spectroscopy, Voronezh State University (Voronezh,
Russian Federation).

Irina G. Grevtseva, Voronezh State University, 1 Universitetskaya pl., Voronezh 394018, Russian Federation

Cand. Sci. (Phys.–Math.)., Senior
Lecturer at the Department of Optics and Spectroscopy,
Voronezh State University, Voronezh, Russian
Federation.

Lolita P. Nesterenko, Voronezh State University, 1 Universitetskaya pl., Voronezh 394018, Russian Federation

Cand. Sci. (Phys.–Math.).,
Associate Professor, Department of Experimental
Physics, Voronezh State University (Voronezh, Russian
Federation).

Oleg V. Ovchinnikov, Voronezh State University, 1 Universitetskaya pl., Voronezh 394018, Russian Federation

Dr. Sci. (Phys.–Math.)., Full
Professor, Head of the Department of Optics and
Spectroscopy, Voronezh State University (Voronezh,
Russian Federation).

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