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Energy level alignment at the methylammonium lead iodide/copper phthalocyanine interface
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/content/aip/journal/aplmater/2/8/10.1063/1.4889844
2014-08-05
2014-12-25

Abstract

The energy level alignment at the CHNHPbI/copper phthalocyanine (CuPc) interface is investigated by X-ray photoelectron spectroscopy (XPS) and ultraviolet photoelectron spectroscopy (UPS). XPS reveal a 0.3 eV downward band bending in the CuPc film. UPS validate this finding and further reveal negligible interfacial dipole formation – verifying the viability of vacuum level alignment. The highest occupied molecular orbital of CuPc is found to be closer to the Fermi level than the valance band maximum of CHNHPbI, facilitating hole transfer from CHNHPbI to CuPc. However, subsequent hole extraction from CuPc may be impeded by the downward band bending in the CuPc layer.

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Scitation: Energy level alignment at the methylammonium lead iodide/copper phthalocyanine interface
http://aip.metastore.ingenta.com/content/aip/journal/aplmater/2/8/10.1063/1.4889844
10.1063/1.4889844
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