Вышедшие номера
Layered Ruddlesden Popper Perovskites with Various Thicknesses for Stable Solid-State Solar Cells
Полная версия: 10.1134/S1063783420030051
Bakhshayesh A.M.1, Abdizadeh H.1,2, Mirhosseini M.3, Taghavinia N.3
1School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, P.O. Box-515, Tehran, Iran
2Center of Excellence for High Performance Materials, University of Tehran, P.O. Box-515, Tehran, Iran
3Department of Physics, Sharif University of Technology, P.O. Box, Tehran, Iran
Email: abdizade@ut.ac.ir
Поступила в редакцию: 1 ноября 2019 г.
Выставление онлайн: 18 февраля 2020 г.

The present research comes up with optimizing the layers thickness of a Ruddlesden-Popper perovskite with the general formula of (S0.97S'0.03)2[Cs0.05 (FA0.097MA0.03)0.95]n-1 Pbn(I0.97Br0.03)3n+1 for efficient, stable solar cell applications. Such a triple-cation quasi-two-dimensional (2D) structure simultaneously contains two spacers, namely 5-ammonium valeric acid iodide (S) and tetra-n-octylammonium bromide (S'). Systematic studies showed that morphology, crystal structure, optical properties, photovoltaic performance, and internal resistances of this compound depended upon the value of the n integer. Field emission scanning electron microscopy set forth that the deposited films were composed of various morphologies depending on the n value. An increase in the n value resulted in improving the light absorption, reducing the band gap energy, and blue-shifting the photoluminescence peak. So as to fabricate solar cells, CuInS2 nanoparticles were employed as a novel hole-transporting material. The device based on the film having n=4 value showed the highest power conversion efficiency of 10.2%. Electrochemical impedance spectroscopy demonstrated that the improved performance of this cell was mainly thanks to its low series resistance (11.68 Omega), high charge recombination resistance (922.35 Omega), and long electron lifetime (8.05 μs) as compared to all the fabricated cells. Moreover, this cell displayed a maximum external quantum efficiency of 82% among all the devices. The un-encapsulated solar cells showed that the output reduction directly depended on the n value so that the cell based on the n=4 reached 82% of its initial power over 2500 h in ambient conditions. Keywords: ruddlesden Popper structure, 2D triple-cation perovskite, solar cells, tetra-n-octylammonium bromide.

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