This article is cited in
1 paper
Surface physics, thin films
Layered Ruddlesden–Popper perovskites with various thicknesses for stable solid-state solar cells
A. M. Bakhshayesha,
H. Abdizadehab,
M. Mirhosseinic,
N. Taghaviniac a School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, P.O. Box 14395-515, Tehran, Iran
b Center of Excellence for High Performance Materials, University of Tehran, P.O. Box 14395-515, Tehran, Iran
c Department of Physics, Sharif University of Technology, P.O. Box 11155-9161, Tehran, Iran
Abstract:
The present research comes up with optimizing the layers thickness of a Ruddlesden–Popper perovskite with the general formula of (S
$_{0.97}$S’
$_{0.03}$)
$_2$[Cs
$_{0.05}$(FA
$_{0.097}$MA
$_{0.03}$)
$_{0.95}$]
$_{n-1}$Pb
$_n$(I
$_{0.97}$Br
$_{0.03}$)
$_{3n+1}$ 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, CuInS
$_2$ 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
$\mu$s) as compared to all the fabricated cells. Moreover, this cell displayed a maximum external quantum efficiency of 82
Keywords:
ruddlesden Popper structure, 2D triple-cation perovskite, solar cells, tetra-$n$-octylammonium bromide. Received: 01.11.2019
Revised: 05.11.2019
Accepted: 08.11.2019
Language: English
Fulltext:
PDF file (33 kB)
