Semiconductors

The effect of introducing monoethanolammonium cation into hybrid halide perovskite films on the nature of their low-temperature conductivity

M. K. Ovezov^a, A. A. Ryabko^a, P. A. Aleshin^a, A. N. Lodygin^a, I. A. Vrublevsky^b, V. A. Moshnikov^c, A. N. Aleshin<sup>a

a</sup> Ioffe Institute, St. Petersburg
^b Belarussian State University of Computer Science and Radioelectronic Engineering
^c Saint Petersburg Electrotechnical University "LETI"

Abstract: Hybrid organo-inorganic halide perovskites are promising materials for optoelectronic devices. In this work, it was shown that the introduction of the monoethanolammonium cation MEA into the hybrid perovskite MAPbI$_3$ leads to a change in the characteristic absorption peaks of FTIR spectroscopy, indicating chemical interaction of the monoethanolammonium cation with the hybrid perovskite. An increase in the proportion of the monoethanolammonium cation in the hybrid perovskite leads to an increase in the absorption edge energy of the perovskite and a significant change in the shape of the spectra, as well as to a change in the band diagram. Low-temperature conductivity (in the range of 200–100 K) is characterized by suppression of the ionic component, which is also accompanied by a significant decrease in the hysteresis of the current-voltage characteristics of the films. The results of measuring the temperature dependence of the current-voltage characteristics showed that the use of the monoethanolammonium cation in the hybrid perovskite leads to an increase in the activation energy of ionic conductivity and a decrease in hysteresis, which helps to reduce the degradation of devices based on hybrid perovskites.

Keywords: hybrid halide perovskites, monoethanolammonium cations, solar cells, low-temperature conductivity, hysteresis, I–V characteristics.

Received: 02.07.2025
Revised: 02.07.2025
Accepted: 03.07.2025

DOI: 10.61011/FTT.2025.08.61311.174-25

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