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An Efficient and Thickness Insensitive Cathode Interface Material for High Performance Inverted Perovskite Solar Cells with 17.27 % Efficiency

Abstract

In inverted planar heterojunction (PHJ) perovskite solar cells (PSCs), the interface layer between the electron transporting layer and cathode plays a very important role to achieve high power efficiency. Herein, we present the synthesis of a new water/alcohol soluble small molecular cationic compound based on naphthalene diimide functionalized pyridinium salt N,N'-Bis(1-n-hexylpyridinium-4-ylmethyl)-1,4,5,8-naphthalenetetracarboxydiimide (PN6). PN6 exhibits a large band gap (2.95 eV), high electron mobility (7.1×10-5 cm2/Vs), deep LUMO energy level (-4.07 eV) and can easily form highly transparent thin films. By introducing it as cathode interface layer in PHJ PSCs, PN6 can effectively decrease the work function of the cathode, boosting all the photovoltaic parameters of the fabricated devices. By using PN6 in ITO/NiOx/Perovskite/PC61BM/PN6/Ag device structure, a power conversion efficiency (PCE) of 17.27 % is obtained. Moreover, it is observed that the performance of PHJ PSCs with PN6 interface layer is insensitive to the interlayer thickness and even at a thickness of 30 nm; the PCE of the device can still reach up to 15.37 %, which makes it compatible with large-area roll-to-roll processing technology. These results demonstrate that the naphthalene diimide functionalized pyridinium salt can be a new category of water/alcohol soluble cathode interface material for high performance PHJ PSCs.

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Publication details

The article was received on 28 Feb 2017, accepted on 15 May 2017 and first published on 16 May 2017


Article type: Paper
DOI: 10.1039/C7TC00882A
Citation: J. Mater. Chem. C, 2017, Accepted Manuscript
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    An Efficient and Thickness Insensitive Cathode Interface Material for High Performance Inverted Perovskite Solar Cells with 17.27 % Efficiency

    S. Peng, J. Miao, I. Murtaza, L. Zhao, Z. Hu, M. Liu, T. Yang, Y. Liang, H. Meng and W. Huang, J. Mater. Chem. C, 2017, Accepted Manuscript , DOI: 10.1039/C7TC00882A

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