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journal article·2014-08-01Open access

Energy level alignment at the methylammonium lead iodide/copper phthalocyanine interface

Shi Chen, Teck Wee Goh, Dharani Sabba, Julianto Chua, Nripan Mathews, Cheng Hon Alfred Huan, Tze Chien Sum

APL Materials· Volume 2· Issue 8
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Source abstract

Abstract

The energy level alignment at the CH3NH3PbI3/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 CH3NH3PbI3, facilitating hole transfer from CH3NH3PbI3 to CuPc. However, subsequent hole extraction from CuPc may be impeded by the downward band bending in the CuPc layer.
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Research context

OpenAlex topics: Perovskite Materials and Applications · Quantum Dots Synthesis And Properties · Chalcogenide Semiconductor Thin Films

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Nanyang Technological University 1 Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, , 21 Nanyang Link, Singapore 637371, Singapore

Research Techno Plaza 2 Energy Research Institute @NTU (ERI@N), , X-Frontier Block, Level 5, 50 Nanyang Drive, Singapore 637553, Singapore

Nanyang Technological University 3 School of Materials Science and Engineering, , Nanyang Avenue, Singapore 639798, Singapore

Institute of High Performance Computing 4 , 1 Fusionopolis Way, #16–16 Connexis, Singapore 138632, Singapore

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