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

Authors :
Rakstys, Kasparas
Paek, Sanghyun
Gao, Peng
Gratia, Paul
Marszalek, Tomasz
Grancini, Giulia
Cho, Kyung Taek
Genevicius, Kristijonas
Jankauskas, Vygintas
Pisula, Wojciech
Nazeeruddin, Mohammad Khaja
Source :
Journal of Materials Chemistry A; 5/7/2017, Vol. 5 Issue 17, p7811-7815, 5p
Publication Year :
2017

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 (FAPbI<subscript>3</subscript>)<subscript>0.85</subscript>(MAPbBr<subscript>3</subscript>)<subscript>0.15</subscript>. 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. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
20507488
Volume :
5
Issue :
17
Database :
Complementary Index
Journal :
Journal of Materials Chemistry A
Publication Type :
Academic Journal
Accession number :
122863376
Full Text :
https://doi.org/10.1039/c7ta01718a