Study of the influence of the composition on the crystalline structure, the optical properties and the lifetime of photogenerated current carriers in AgxCu1–xGaSe2 (0 ≤ x ≤ 1) solid solutions

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Abstract

In this paper, a series of AgxCu1–xGaSe2 (0 ≤ x ≤ 1) solid solution powders were prepared by solid-phase synthesis. The single-phase tetragonal structure of the samples (space group I-42d) was determined by a combination of X-ray phase analysis and Raman spectroscopy. It is shown that their lattice parameters do not conform to the Vegard's law up to x ≈ 0.4. It is found that the width of the forbidden band of the samples also changes nonlinearly: first decreases and then increases. The study of the spectra of low-temperature luminescence and microwave photoconductivity decay has shown that for a series of samples with x from 0 to ≈0.4, and then at the section with x > 0.4, an increase in the lifetime of photogenerated current carriers in AgxCu1–xGaSe2 powders is characteristic. The observed phenomenon seems to be due to the replacement of deep traps for charge carriers, such as selenium vacancies, by smaller cationic vacancies.

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About the authors

V. V. Rakitin

Federal Research Center for Problems of Chemical Physics and Medicinal Chemistry, RAS

Email: gmw1@mail.ru
Russian Federation, Chernogolovka

M. V. Gapanovich

Federal Research Center for Problems of Chemical Physics and Medicinal Chemistry, RAS; Moscow State University

Author for correspondence.
Email: gmw1@mail.ru
Russian Federation, Chernogolovka; Moscow

D. S. Lutsenko

Federal Research Center for Problems of Chemical Physics and Medicinal Chemistry, RAS; Moscow State University

Email: gmw1@mail.ru
Russian Federation, Chernogolovka; Moscow

V. B. Nazarov

Federal Research Center for Problems of Chemical Physics and Medicinal Chemistry, RAS

Email: gmw1@mail.ru
Russian Federation, Chernogolovka

A. V. Stanchik

State Scientific and Production Association, Scientific-Practical Materials Research Center of the National Academy of Sciences of Belarus

Email: gmw1@mail.ru
Belarus, Minsk

V. F. Gremenok

State Scientific and Production Association, Scientific-Practical Materials Research Center of the National Academy of Sciences of Belarus

Email: gmw1@mail.ru
Belarus, Minsk

A. V. Kobylyatskiy

State Scientific and Production Association, Scientific-Practical Materials Research Center of the National Academy of Sciences of Belarus

Email: gmw1@mail.ru
Belarus, Minsk

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2. 1. Diffractograms of AgxCu1–xGaSe2 powders (a) and the dependence of the crystal lattice parameters a, c, and V on the silver content (b).

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3. Fig. 2. Raman spectra for AgxCu1–xGaSe2 powders.

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4. 3. Reflection spectra (a) and absorption spectra in Taut coordinates (b): 1 – CuGaSe2, 2 – Ag0.3Cu0.7GaSe2, 3 – Ag0.46Cu0.54GaSe2, 4 – Ag0.63Cu0.37GaSe2, 5 – AgGaSe2. Dependences of the band gap width Eg and unit cell volume V on the silver content in AgxCu1–xGaSe2 powders (b).

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5. Рис. 4. Luminescence spectra at T = 77 K for AgxCu1–xGaSe2: 1 - CuGaSe2, 2 – Ag0.3Cu0.7GaSe2, 3 – Ag0.46Cu0.54GaSe2, 4 – Ag0.63Cu0.37GaSe2, 5 - AgGaSe2.

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6. Fig. 5. Dependences of the maximum of the E2 peak at 77 K from the table. 1 and the band gap U, determined from the reflection spectra at room temperature, on the silver content in AgxCu1–xGaSe2 powders.

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