Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 5, Issue 17, Pages 7811-7815Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ta01718a
Keywords
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Funding
- SNSF NRP 70 project, Solaronix, Aubonne, Switzerland [407040_154056, CTI 15864.2 PFNM-NM]
- European Commission [H2020-ICT-2014-1]
- SOLEDLIGHT project [643791]
- Swiss State Secretariat for Education, Research and Innovation (SERI)
- NPRP award from the Qatar National Research Fund [NPRP 6-175-2-070]
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Through judicious molecular engineering, novel dopant-free star-shaped D-pi-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(3))(0.85)(MAPbBr)(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, p-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.
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