New iridium complex as additive to the spiro-OMeTAD in perovskite solar cells with enhanced stability

Laura Badia,Juan Bisquert,Rafael S Sánchez,Eva M Barea,Elena Mas-Marzá,Iván Mora-Seró

doi:10.1063/1.4890545

Laura Badia, Juan Bisquert + Show 4 more

Open Access

https://doi.org/10.1063/1.4890545

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Journal: APL materials	Publication Date: Jul 23, 2014
Citations: 60	License type: CC BY 4.0

Affiliation: Jaume I University, King Abdulaziz University

Abstract

A new iridium complex, IrCp*Cl(PyPyz)[TFSI], has been synthesized and used as additive for the hole transporter material, spiro-OMeTAD, in perovskite solar cells. The cells prepared with this Ir additive present higher efficiency than reference cells, and similar to cells prepared with Co additive. We have determined that the presence of metal complexes as additives decreases the recombination rate, as it has been observed by impedance spectroscopy. Very interestingly, while the efficiency after 3 months decreases by 22% and 70% for reference cell and cell with Co additive, respectively, the efficiency of devices containing the Ir additive is only decreased by a 4%.

Highlights

Perovskites Solar Cells (PSCs) have attracted an enormous attention due to their impressive light to power conversion efficiency, easy manufacturing with low temperature processes, and simple layer deposition by solution methods.[1]
PSCs were firstly prepared in sensitized configuration using liquid electrolyte obtaining promising results,[2] the undoubtedly major breakthrough was achieved when the all-solid configuration was exploited in 2012.3,4 Nowadays, efficiency of PSCs has broadly surpassed 17%,5 and many groups worldwide are in a competition to reach higher efficiencies and stabilities
The most commonly used hole transporter material (HTM) in PSCs is spiro-OMeTAD (2,2,7,7 -tetrakis(N,N -di-p-methoxyphenylamine)-9,9 -spirobifluorene).[14]. It is well known from the previous experience in Dye Sensitized Solar Cells (DSCs) that the solar cell performance is increased significantly when additives as 4-tert-butylpyridine and lithium bis(trifluoromethylsulphonyl)imide are added to the spiro-OMeTAD layer.[18]

Summary

Introduction

Perovskites Solar Cells (PSCs) have attracted an enormous attention due to their impressive light to power conversion efficiency, easy manufacturing with low temperature processes, and simple layer deposition by solution methods.[1]. New iridium complex as additive to the spiro-OMeTAD in perovskite solar cells with enhanced stability

Results

Conclusion