News

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

Last year Julia Stähler and I were invited by Chemical Physics to write a Perspective article on our work on hybrid inorganic-organic systems (HIOS). This work is part of the collaborative research center HIOS in Berlin (https://www.physik.hu-berlin.de/de/sfb951). Read more at http://www.sciencedirect.com/science/article/pii/S0301010416306784 .

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. Read more here

  • Published:
  • Updated:
Share
URL copied!

Related news

Metsähovi Radio Observatory, Joni Tammi
Research & Art Published:

Three fascinating facts about space – which mystery would space researcher Joni Tammi like to understand?

When Joni Tammi was on the first grade, he gave his first school presentation about stars. It started a journey that led to a career in space research. But what was the brainwave he got during his studies on a course taught by astronomer Esko Valtaoja?
computer illustration of a cut away of the donut-shaped fusion reactor, showing that it much larger tha human
Cooperation, Research & Art Published:

Aalto nuclear fusion expert becomes ITER Scientist Fellow

Dr Antti Snicker becomes the first Finnish Scientist Fellow at ITER, modelling transport of fast particles in tokamak plasmas
Marium Durrani
Research & Art, Studies Published:

Revival of garment mending: communal reskilling addresses global issues of textile waste

Dissertation of the month: Mending clothes, one of the oldest practices known to humankind, nowadays stands for global awareness of the textile waste problem.

Ääniaalto Festival III
Research & Art Published:

ÄÄNIAALTO V OPEN CALL

ÄÄNIAALTO is an annual festival of audio-visual oddity. It aims to nurture and expand the sound/new media scene in Helsinki, and provide an open culture that is accessible to anybody interested.