Issue 32, 2021

Fluoroarene derivative based passivation of perovskite solar cells exhibiting excellent ambient and thermo-stability achieving efficiency >20%

Abstract

Hybrid perovskite solar cells (PVSCs) are extremely susceptible to moisture and heat, which restricts their commercial viability. Herein, three multifunctional fluoroaromatic amine additives i.e. 4-fluoroaniline (FA), 2,4,6-trifluoroaniline (TFA) and 2,3,4,5,6-pentafluoroaniline (PFA) are utilized as passivating additives to enhance the stability of the perovskite films, thereby improving the efficiency of PVSCs. Among these fluorinated aromatic amines, PFA most proficiently improved the efficiency along with the moisture and thermo-stability of MAPbI3 based PVSCs. PFA significantly passivated the defects and assisted better charge transport in the devices. The power conversion efficiency (PCE) was enhanced beyond 20% for the PFA passivated device, compared to the 15.08% of the pristine device without any passivation. Moreover, the PFA passivated device retained up to 87% PCE, compared to 26% for the pristine device when exposed to relative humidity ∼50% for 1000 h. The fluorine atoms attached to the passivation additives were able to provide protection to the PVSCs against moisture induced erosion. Moreover, only 10% efficiency was maintained by the pristine device in comparison to 82% for the PFA based device after 20 h of heating at 100 °C inside a glovebox. Thus this work presented a generic approach to improve the overall stability and performances of PVSCs, thereby widening the possibility towards practical applications.

Graphical abstract: Fluoroarene derivative based passivation of perovskite solar cells exhibiting excellent ambient and thermo-stability achieving efficiency >20%

Supplementary files

Article information

Article type
Paper
Submitted
20 Cax 2021
Accepted
12 Qad 2021
First published
12 Qad 2021

J. Mater. Chem. C, 2021,9, 10406-10413

Fluoroarene derivative based passivation of perovskite solar cells exhibiting excellent ambient and thermo-stability achieving efficiency >20%

M. Hossain, R. Garai, R. K. Gupta, R. N. Arunagirinathan and P. K. Iyer, J. Mater. Chem. C, 2021, 9, 10406 DOI: 10.1039/D1TC02335G

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