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Humboldt-Universität zu Berlin - Mathematisch-Naturwissen­schaft­liche Fakultät - SFB 951 - HIOS

Collaborative Research Centre 951 - CRC 951
Sonderforschungs­bereich 951 - SFB 951

The CRC 951 - Hybrid Inorganic/Organic Systems for Opto-Electronics (HIOS) - is an interdisciplinary effort bringing together scientists with complementary expertise from three universities and two non-university institutions. The goal is the merger of inorganic semiconductors, conjugated organic materials, and metal nanostructures into novel hybrid structures. Elucidating and tailoring the fundamental chemical, electronic, and photonic interactions in these systems will enable us the development of functional elements exhibiting superior opto-electronic functionalities not achievable with any of the individual material classes alone. The CRC 951 was founded in July 2011 and is currently in its third funding period (2019-2023).

Learn more about the interesting concepts and ideas of HIOS in our clip.

+++ Postdoctoral Position available+++

Current Events
Ulrich Höfer
Katharina Franke

Ulrich Höfer

Fachbereich Physik, Philipps-Universität Marburg, Germany

Katharina Franke

Department of Physics, Freie Universität Berlin, Germany

Bert Hecht
Günter Kewes

Bert Hecht

Experimental Physics, Universität Würzburg, Germany

Günter Kewes

Department of Physics, Humboldt-Universität zu Berlin, Germany

View all CRC 951 Events


Recent Research Highlights
Gap states induce soft Fermi level pinning upon charge transfer at ZnO/molecular acceptor interfaces


The deposition of strong molecular electron acceptors onto ZnO induces a substantial work function (ϕ) increase due to electron transfer from the inorganic semiconductor to the molecules. The ϕ increase results from two mechanisms: (i) a change of the surface band bending within ZnO and (ii) an interface dipole between the inorganic surface and the negatively charged acceptors.


R. Schlesinger, et al.

Phys. Rev. Materials 3, 074601 (2019)

DOI: 10.1103/PhysRevMaterials.3.074601

Unraveling the electronic properties of lead halide perovskites with surface photovoltage in photoemission studies


The authors of this CRC 951 research highlight demonstrate that the surface photovoltage (SPV) is akey phenomenon occurring at the perovskite surfaces thatfeature a non-negligible density of surface states, which is more the rule than an exception for most materials understudy.


F. Zu, et al.

ACS Appl. Mater. Interfaces 11, 21578 (2019)

DOI: 10.1021/acsami.9b05293

Direct observation of state-filling at hybrid tin oxide/organic interfaces


Electroluminescence (EL) spectra of hybrid charge transfer states at metal oxide/organic type-II heterojunctions exhibit bias-induced spectral shifts. The authors of this CRC 951 research highlight combine the results of EL and photovoltaic measurements to eliminate the unavoidable effect of the series resistance of inorganic and organic components on the total voltage drop across the hybrid device.


U. Hörmann, et al.

Appl. Phys. Lett. 114, 183301 (2019)

DOI: 10.1063/1.5082704

View all CRC 951 Research Highlights


Topically, HIOS is part of the Integrative Research Institute for the Sciences (IRIS Adlershof) where hybrid systems are one of the strategic focal points. IRIS is also supporting the CRC 951 by providing office space and assistance in the organization of scientific events.

Institutions:        FHI-Logo        HZB-Logo          Uni Potsdam-Logo          TU Berlin-Logo         HU Berlin-Logo

            IRIS Logo              Funded by:       DFG Logo