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Molecular engineering of face-on oriented dopant-free hole transporting material for perovskite solar cells with 19% PCE

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Abstract

Through judicious molecular engineering, novel dopant-free star-shaped D–π–A type hole transporting materials coded KR355, KR321, and KR353 were systematically designed, synthesized and characterized. KR321 has been revealed to form a particular face-on organization on perovskite films favoring vertical charge carrier transport and for the first time, we show that this particular molecular stacking feature resulted in a power conversion efficiency over 19% in combination with mixed-perovskite (FAPbI3)0.85(MAPbBr3)0.15. The obtained 19% efficiency using a pristine hole transporting layer without any chemical additives or doping is the highest, establishing that the molecular engineering of a planar donor core, π-spacer and periphery acceptor leads to high mobility, and the design provides useful insight into the synthesis of next-generation HTMs for perovskite solar cells and optoelectronic applications.

Graphical abstract: Molecular engineering of face-on oriented dopant-free hole transporting material for perovskite solar cells with 19% PCE

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Publication details

The article was received on 24 Feb 2017, accepted on 29 Mar 2017 and first published on 29 Mar 2017


Article type: Communication
DOI: 10.1039/C7TA01718A
Citation: J. Mater. Chem. A, 2017, Advance Article
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    Molecular engineering of face-on oriented dopant-free hole transporting material for perovskite solar cells with 19% PCE

    K. Rakstys, S. Paek, P. Gao, P. Gratia, T. Marszalek, G. Grancini, K. T. Cho, K. Genevicius, V. Jankauskas, W. Pisula and M. K. Nazeeruddin, J. Mater. Chem. A, 2017, Advance Article , DOI: 10.1039/C7TA01718A

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