Global and local aspects of the surface potential landscape for energy level alignment at organic-ZnO interfaces

Julia Stähler, Patrick Rinke

Research output: Contribution to journalArticleScientificpeer-review

14 Citations (Scopus)

Abstract

Hybrid systems of organic and inorganic semiconductors are a promising route for the development of novel opto-electronic and light-harvesting devices. A key ingredient for achieving a superior functionality by means of a hybrid system is the right relative position of energy levels at the interfaces of the two material classes. In this Perspective, we address the sensitivity of the potential energy landscape at various ZnO surfaces, a key ingredient for interfacial energy level alignment, by combining one- and two-photon photoelectron spectroscopy with density-functional theory calculations (DFT). We show that even very large work function changes (>2.5 eV) do not necessarily have to be accompanied by surface band bending in ZnO. Band bending – if it does occur – may be localized to few Å or extend over hundreds of nanometers with very different results for the surface work function and energy level alignment. Managing the delicate balance of different interface manipulation mechanisms in organic–inorganic hybrid systems will be a major challenge towards future applications.

Original languageEnglish
Pages (from-to)149-165
Number of pages17
JournalChemical Physics
Volume485-486
DOIs
Publication statusPublished - 1 Mar 2017
MoE publication typeA1 Journal article-refereed

Keywords

  • Density-functional theory
  • Electronic structure theory
  • Energy level alignment
  • Inorganic/organic hybrid systems
  • Surface band bending
  • Transparent conductive oxides
  • Ultrafast spectroscopy
  • Zinc oxide

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