Journal
ADVANCED ENERGY MATERIALS
Volume 9, Issue 33, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201901257
Keywords
electrolytes; hole-blocking layers; interfacial engineering; perovskite solar cells
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Funding
- Deutsche Forschungsgemeinschaft (DFG) [SFB 1249]
- European Research Council (ERC) under the European Union [714067]
- European Research Council (ERC) [714067] Funding Source: European Research Council (ERC)
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Four pi-extended phosphoniumfluorene electrolytes (pi-PFEs) are introduced as hole-blocking layers (HBL) in inverted architecture planar perovskite solar cells with the structure of ITO/PEDOT:PSS/MAPbI(3)/PCBM/HBL/Ag. The deeplying highest occupied molecular orbital energy level of the p-PFEs effectively blocks holes, decreasing contact recombination. It is demonstrated that the incorporation of pi-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 non-radiative recombination in perovskite devices and compensates for a nonideal energetic alignment at the hole-transport layer/perovskite interface.
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