Research in Germany:Berlin - Adlershof

Institut für Physik & IRIS AdlershofHumboldt-Universität zu Berlin

Helmholtz Zentrum Berlinfür Materialien und Energie GmbH

Norbert Kochnorbert.koch@physik.hu-berlin.de

energy materials for electronics & optoelectronics

Humboldt-Universität zu Berlin

one of Germany’s top research universities

39.000 students

6.000 students from abroad

over 450 tenured faculty members

all main disciplines of humanities,

social and cultural sciences, human medicine,

mathematics & natural sciences

HZB: one center - two sources

annual budget: 110 million Euro

staff: 1.100

scientists: 400

international users: more than 3.000 p.a.

500 2.500

Science with

Neutrons

Science with

PhotonsUser Service

Solar Energy

Research

Energy Materials

Research

Berlin - Adlershof Science & Technology Park

Berlin

one of the 15 biggest science parks worldwide

6 departments of Humboldt-Universität 10 non-university research institutes over 500 technology orientated companies

6.500 students 16.000 employees

annual turnoverin science & technology:1 billion Euro

Collaborative Research Center - CRC 951

Hybrid Inorganic/Organic Systemsfor Opto-Electronics

HIOS

inorganic semiconductors

metal nano-structures

conjugated organic materials

new electronic and optical properties opto-electronic functions in smallest possible volume

inorganic semiconductors

highest purity levels high excitation density high carrier mobility

Synergy rationale

• combine & take advantage of individual material strengths• compensate weaknesses

conjugated organicmaterials

tunable energy range strong light-matter coupling high frequency response

metal nanostructures

confine guide emit amplify

light at subwavelength dimensions

• new opto-electronic properties via hybridization

Structure & electronic properties

inorganic semiconductor

conjugated organic material

interface energy levels

VBM

CBM

HOMO

LUMO

VBM

CBM

HOMO

LUMO

hybrid material

reality

Optical excitations

-+

Wannier-Mott Frenkel

-

+

?Tailor optical excitation dynamics:

• energy transfer vs. charge transfer• (non-)radiative decay, mobile carriers

excited state hybridization Exploit hybrid excitations

• formation mechanisms• electronic & spatial structure

- +?

--

-

++

+

metallic/dielectric structures:

• coupling of molecular & hybrid excitations with tailored plasmon polaritons /cavities

Plasmonic & photonic coupling

metal nanostructures:

• local increase - absorption / emission- energy transfer

- +

The CRC 951

• 27 PIs & 60 postdocs/students provide complementary expertise in physics and chemistry of semiconductors & molecular systems, optics/photonics, and inorganic & organic opto-electronics

• all relevant methods in theory and experiment for all three material classes

synergistic merger of scientific communities = added value

FHI

www.physik.hu-berlin.de/sfb951

Inorganic surface work function tuning with donors & acceptors:

Unprecedented dynamic rangeCN

CN

F

F

F

F

NC

NC

not limited to ZnO!

Schlesinger, et al., Phys. Rev. B 87 (2013) 155311Schlesinger, et al., Nat. Commun. 6 (2015) 6754Akaike, et al., Adv. Funct. Mater. 26 (2016) 2493

Functionality of hybrid structure with optimized energy levels

PL emission from L4P-sp3 in hybrid

overall PL yield from 5% to 35%

type-I energy levels realized:•efficient energy transfer•electron transfer from L4P-sp3 exciton to ZnO suppressed

Schlesinger, Bianchi, Blumstengel, Christodoulou, Ovsyannikov, Kobin, Moudgil, Barlow, Hecht, Marder, Henneberger, Koch, Nat. Commun. 6 (2015) 6754

2.8 2.9 3.0 3.1 3.2 3.3

PL

Inte

nsity

Energy (eV)

Rendering: Nickl & Partner Architekten AG

The IRIS Research Building @ Campus Adlershof …

… always ready for new cooperations!