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!

Read more news

Tummaan paitaan pukeutunut vaalea lyhyttukkainen nainen seisoo kädet ristissä rinnan edessä, taustalla korkeakoulun tiloja
Appointments, Research & Art, University Published:

Professor Arja Karhumaa: ‘We need to better understand how texts are viewed’

Introducing our tenured professors: professor Arja Karhumaa explores the relationship between language and the visual form of a text –how a text looks at any given moment, and how it affects us as human beings.
Konsta Laakso and Elsi Sloan act in the short film of Oasis of Radical Wellbeing
Research & Art Published:

The short film filmed in Aalto tells about a student's difficult choice

The shooting of the short film Myötätunto III, funded by Aalto University's Oasis of Radical Wellbeing project, began in Otaniemi on March 17th. The premier is on May 30th as a part of the Green Minds, Healthy Hearts – Social Sustainability Symposium in Aalto University's Harald Herlin Learning Center.
Kemiantekniikan opiskelijoita
Research & Art Published:

Are you our new CHEM Data Agent?

Apply to be the next Data Agent from the School of Chemical Engineering.
Illustration: Juuli Miettilä.
Research & Art Published:

Avatars and genuine interaction

Aalto University’s researchers are contributing to the creation of redesigned maternity and child health clinics and positive childbirth experiences in their research projects. The visions seize the potential of technology, such as childbirth simulation in a 3D-video conference using an avatar, a virtual character. On the other hand, the researchers would also like to hold on to the best practices from the past, such as the traditional child health clinic card, genuine human interaction and the rotina tradition, visits by family and close-ones to meet the newborn and bring foods as a gift.