Research of charge carrier transfer processes in films of colloidal quantum dots of CsPbBr3 perovskites by pump-probe spectroscopy

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Abstract

Colloidal quantum dots of CsPbBr₃ perovskites have been synthesised. The average size and polydispersity of the nanocrystals were determined to be 8.3 nm and 16%, respectively. The nanocrystals were employed in the fabrication of thin films via two distinct methods: drop casting and spin coating. The process of charge carrier transport was investigated through the use of laser femtosecond pump-probe spectroscopy. A proposed interpretation of the time-dependent shift of the lumen peak is presented. The Einstein–Smoluchowski equation was employed to estimate the mobility of charge carriers in the films.

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About the authors

A. A. Galyshko

Moscow Institute of Physics and Technology (National Research University)

Email: pevtsov.dn@mipt.ru
Russian Federation, Dolgoprudnyi

G. A. Lochin

Federal Research Center for Problems of Chemical Physics and Medicinal Chemistry, Russian Academy of Sciences; Moscow Institute of Physics and Technology (National Research University)

Email: pevtsov.dn@mipt.ru
Russian Federation, Chernogolovka; Dolgoprudnyi

D. N. Pevtsov

Federal Research Center for Problems of Chemical Physics and Medicinal Chemistry, Russian Academy of Sciences; Moscow Institute of Physics and Technology (National Research University)

Author for correspondence.
Email: pevtsov.dn@mipt.ru
Russian Federation, Chernogolovka; Dolgoprudnyi

A. V. Aybush

Federal Research Centre for Chemical Physics named after N.N. Semenov, Russian Academy of Sciences

Email: pevtsov.dn@mipt.ru
Russian Federation, Moscow

F. E. Gostev

Federal Research Centre for Chemical Physics named after N.N. Semenov, Russian Academy of Sciences

Email: pevtsov.dn@mipt.ru
Russian Federation, Moscow

I. V. Shelaev

Federal Research Centre for Chemical Physics named after N.N. Semenov, Russian Academy of Sciences

Email: pevtsov.dn@mipt.ru
Russian Federation, Moscow

V. A. Nadtochenko

Federal Research Centre for Chemical Physics named after N.N. Semenov, Russian Academy of Sciences; Lomonosov Moscow State University

Email: pevtsov.dn@mipt.ru

Department of Chemistry

Russian Federation, Moscow; Moscow

S. B. Brichkin

Federal Research Center for Problems of Chemical Physics and Medicinal Chemistry, Russian Academy of Sciences; Moscow Institute of Physics and Technology (National Research University)

Email: pevtsov.dn@mipt.ru
Russian Federation, Chernogolovka; Dolgoprudnyi

V. F. Razumov

Federal Research Center for Problems of Chemical Physics and Medicinal Chemistry, Russian Academy of Sciences; Moscow Institute of Physics and Technology (National Research University)

Email: pevtsov.dn@mipt.ru
Russian Federation, Chernogolovka; Dolgoprudnyi

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Supplementary files

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2. Fig. 1. Absorption and luminescence spectra of CsPbBr3 CCT solution.

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3. Fig. 2. The “excitation-luminescence” matrix of the CCT CsPbBr3 solution.

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4. Fig. 3. Time resolution of the CsPbBr3 CT differential absorption matrix at a pumping energy of 45 NJ of a sample produced by (a) drop-casting; (b) spin-coating. The solid red line shows the offset of the peak of illumination relative to the red dotted line indicating the initial position of the peak.

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5. 4. Spectral dependence of the optical density difference at different delay times and the dependence of the energies of the illumination peak position on the delay time. Points (a) and (b) are for a sample made by drop-casting; (c) and (d) are for a sample made by spin–coating. All dependences are given for the pumping energy of 45 NJ. In Figures (b) and (d), the purple and red curves represent the shift of the illumination peak for the sample produced by drop–casting and spin-coating, respectively, while the black curve represents the approximation by bi-exponential decay.

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6. Fig. 5. Dependence of the characteristic process time on the pumping energy: (a) “slow” and “fast” processes for a sample produced by drop-casting; (b) “slow” and “fast” processes for a sample produced by spin-coating; (c) “slow” process for two samples. Dotted lines represent a “fast” process, solid lines indicate a “slow” process for each of the samples.

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7. Fig. 6. Dependence of the diffusion coefficient and mobility on the pumping energy for samples produced by spin-coating and drop-casting.

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