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Boosting Inverted Perovskite Solar Cells Performance by Using Functionalized 9,9-bis(4-diphenylaminophenyl)fluorenes with Triphenylamine as Dopant-free Hole Transporting Materials

Abstract

In this study, two newly developed small molecules based on functionalized 9,9-bis(4-diphenylaminophenyl)fluorenes and triphenylamine moieties, namely TPA-2,7-FLTPA-TPA and TPA-3,6-FLTPA-TPA are designed, synthesized and fully characterized successfully. The electrochemical, optical and thermal properties of both materials are investigated using various techniques. Afterwards, these materials are employed as dopant-free hole transporting materials (HTMs) in planar inverted perovskite solar cell devices with the aim of determining the device performance and studying their stability in comparison with the standard N4,N4,N4’’,N4’’-tetra([1,10-biphenyl]-4-yl)-[1,1’:4’,1’’-terphenyl]-4,4’’-diamine (TaTm) based devices. Under 1 sun condition, the TPA-3,6-FLTPA-TPA based devices achieve a power conversion efficiency (PCE) of 13.9% whereas TPA-2,7-FLTPA-TPA exhibits the highest PCE of 17.1% mainly due to an improvement in the fill factor (FF). Meanwhile, the devices prepared using TaTm as reference HTM exhibit an overall efficiency of 15.9%. In addition to the higher efficiency, our newly developed HTM TPA-2,7-FLTPA-TPA-based devices demonstrate better stability which is comparable to that with TaTm using similar aging test conditions.

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Publication details

The article was received on 14 Feb 2019, accepted on 15 Apr 2019 and first published on 15 Apr 2019


Article type: Paper
DOI: 10.1039/C9TA01681C
Citation: J. Mater. Chem. A, 2019, Accepted Manuscript

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    Boosting Inverted Perovskite Solar Cells Performance by Using Functionalized 9,9-bis(4-diphenylaminophenyl)fluorenes with Triphenylamine as Dopant-free Hole Transporting Materials

    P. M. Sonar, H. Pham, L. Gil-Escrig, K. Feron, S. Manzhos, H. J. Bolink and S. Albrecht, J. Mater. Chem. A, 2019, Accepted Manuscript , DOI: 10.1039/C9TA01681C

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