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Revealing the electronic energy landscape of multi-layered (opto)electronic devices

Objective

Modern optoelectronic (OE) devices such as light-emitting or photovoltaic diodes offer exciting opportunities for the future. A wide range of materials has been utilized in these devices, including among others: organic materials, inorganic quantum dots and hybrid perovskites. While the functionality, performance and device physics vary strongly from material to material and device to device, all OE devices depend on the energy levels of their individual components and the interaction of the electronic states at the various heterointerfaces. Lacking a method to map the energy levels in a device, energy level diagrams reported for most devices consist of a combination of individual energy levels for each material, which neglect interactions between the materials (that may cause interfacial dipoles and/or band bending) and do not represent the true energetic landscape. Despite this, they are routinely used for interpretation of device performance and physics.
This project aims to map the energy levels in real functional devices: revealing the true nature of buried interfaces, multilayers and contacts, and to answer fundamental long-standing questions in the field of OE, such as the origin of photovoltage losses and energetics of injection/extraction contacts of devices. We will develop and utilize a “Ultra-violet photoemission spectroscopy (UPS) depth profiling” technique based on the combination of UPS with Ar gas cluster ion beam (GCIB) etching that induces minimal surface damage, on a wide range of organic, inorganic and hybrid materials and devices. We will reveal the true energy level landscapes of devices and monitor their evolution throughout the device lifetime. Furthermore, we will explore the possibility to expand the use of GCIB etching beyond UPS as a new nanofabrication technique. These studies will open new frontiers in OE research and would allow the development of novel interface engineering approaches, device architectures and material design rules.

Field of science

  • /natural sciences/chemical sciences/analytical chemistry/spectroscopy
  • /engineering and technology/environmental engineering/energy and fuels/fossil energy/gas

Call for proposal

ERC-2016-STG
See other projects for this call

Funding Scheme

ERC-STG - Starting Grant

Host institution

TECHNISCHE UNIVERSITAET DRESDEN
Address
Helmholtzstrasse 10
01069 Dresden
Germany
Activity type
Higher or Secondary Education Establishments
EU contribution
€ 1 316 306

Beneficiaries (2)

TECHNISCHE UNIVERSITAET DRESDEN
Germany
EU contribution
€ 1 316 306
Address
Helmholtzstrasse 10
01069 Dresden
Activity type
Higher or Secondary Education Establishments
RUPRECHT-KARLS-UNIVERSITAET HEIDELBERG

Participation ended

Germany
EU contribution
€ 181 625
Address
Seminarstrasse 2
69117 Heidelberg
Activity type
Higher or Secondary Education Establishments