Charge generation layers comprising transition metal-oxide/organic interfaces. Electronic structure and charge generation mechanism

Journal Article · Fri Jan 01 00:00:00 EST 2010 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.3427430· OSTI ID:1064765

Meyer, Jens ^[1]; Kröger, M. ^[2]; Hamwi, S. ^[3]; Gnam, F. ^[2]; Riedl, T. ^[4]; Kowalsky, W. ^[3]; Kahn, Antoine ^[1]

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1. Princeton Univ., NJ (United States)
2. InnovationLab GmbH, Heidelberg (Germany)
3. Technical Univ. of Braunschweig (Germany)
4. Univ. of Wuppertal (Germany)

The energetics of an archetype charge generation layer (CGL) architecture comprising of 4,4' ,4 '' -tris(N -carbazolyl)triphenylamine (TCTA), tungsten oxide (WO₃ ) , and bathophenanthroline (BPhen) n-doped with cesium carbonate (Cs₂ CO₃ ) are determined by ultraviolet and inverse photoemissionspectroscopy. We show that the charge generation process occurs at the interface between the hole-transport material (TCTA) and WO₃ and not, as commonly assumed, at the interface between WO₃ and the n-doped electron-transport material (BPhen:Cs₂ CO₃ ) . However, the n-doped layer is also essential to the realization of an efficient CGL structure. The charge generation mechanism occurs via electron transfer from the TCTA highest occupied molecular orbital level to the transition metal-oxide conduction band.

• Research Organization: Energy Frontier Research Centers (EFRC) (United States). Center for Interface Science: Solar Electric Materials (CISSEM)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES)
• Contributing Organization: Princeton University, National Science Foundation, German Federal Ministry for Education and Research
• DOE Contract Number: SC0001084
• OSTI ID: 1064765
• Journal Information: Applied Physics Letters, Vol. 96, Issue 19; Related Information: CISSEM partners with the University of Arizona (lead); Georgia Institute of Technology; National Renewable Energy Laboratory; Princeton University; University of Washington; ISSN 0003-6951
• Publisher: American Institute of Physics (AIP)
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
solar (photovoltaic)
electrodes - solar
charge transport
synthesis (novel materials)
synthesis (self-assembly)
synthesis (scalable processing)