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Enhancing the open-circuit voltage of perovskite solar cells by up to 120 mv using π-extended phosphoniumfluorene electrolytes as hole blocking layers

Four π-extended phosphoniumfluorene electrolytes (π-PFEs) are introduced as hole-blocking layers (HBL) in inverted architecture planar perovskite solar cells with the structure of ITO/PEDOT:PSS/MAPbI3/PCBM/HBL/Ag. The deep-lying highest occupied molecular orbital energy level of the π-PFEs effective...

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Bibliographic Details
Main Authors: An, Qingzhi (Author) , Sun, Qing (Author) , Weu, Andreas (Author) , Becker-Koch, David (Author) , Paulus, Fabian (Author) , Arndt, Sebastian (Author) , Stuck, Fabian (Author) , Hashmi, A. Stephen K. (Author) , Vaynzof, Yana (Author)
Format: Article (Journal)
Language:English
Published: June 19, 2019
In: Advanced energy materials
Year: 2019, Volume: 9, Issue: 33
ISSN:1614-6840
DOI:10.1002/aenm.201901257
Online Access:Resolving-System, Volltext: https://doi.org/10.1002/aenm.201901257
Verlag: https://onlinelibrary.wiley.com/doi/abs/10.1002/aenm.201901257
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Author Notes:Qingzhi An, Qing Sun, Andreas Weu, David Becker‐Koch, Fabian Paulus, Sebastian Arndt, Fabian Stuck, A. Stephen K. Hashmi, Nir Tessler, and Yana Vaynzof
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Summary:Four π-extended phosphoniumfluorene electrolytes (π-PFEs) are introduced as hole-blocking layers (HBL) in inverted architecture planar perovskite solar cells with the structure of ITO/PEDOT:PSS/MAPbI3/PCBM/HBL/Ag. The deep-lying highest occupied molecular orbital energy level of the π-PFEs effectively blocks holes, decreasing contact recombination. It is demonstrated that the incorporation of π-PFEs introduces a dipole moment at the PCBM/Ag interface, resulting in significant enhancement of the built-in potential of the device. This enhancement results in an increase in the open-circuit voltage of the device by up to 120 mV, when compared to the commonly used bathocuproine HBL. The results are confirmed both experimentally and by numerical simulation. This work demonstrates that interfacial engineering of the transport layer/contact interface by small molecule electrolytes is a promising route to suppress nonradiative recombination in perovskite devices and compensates for a nonideal energetic alignment at the hole-transport layer/perovskite interface.
Item Description:Gesehen am 08.11.2019
Physical Description:Online Resource
ISSN:1614-6840
DOI:10.1002/aenm.201901257

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