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hybrid perovskite single crystals
rubrene OFETs
Professor Shahab Shojaei-Zadeh publishes in Phys Rev Fluids
Fabris Group Research

Why and how do we chemically dope organic semiconductors?

Categories: Laboratory for Surface Modification (LSM)
Speaker: Antoine Kahn, Princeton University
Date & Time: February 19, 2009 - 12:00pm
Location: Chem. 260

Doping is poised to become an important tool to increase film conductivity, control Fermi level position and facilitate carrier injection in molecular semiconductors.  P-type doping of common hole-transport materials has been achieved with molecules like the electronegative fluorinated F4-TCNQ over the past few years. In this talk, we describe work on new p-type and n-type dopants aimed at enhancing film conductivity and charge carrier injection via tunneling through narrow depletion regions. Energetics of doping are determined by ultra-violet and inverse photoemission spectroscopies (UPS, IPES). We report on very recent work on p-doping with a fluorinated molybdenum compound that exhibits a larger electron affinity (EA) than F4-TCNQ. N-doping is challenging because of the low electron affinity (EA~1.5-2.5 eV) of most electron-transport molecular materials of interest. N-dopants must have low ionization energy, which makes them inherently unstable against oxidation. We demonstrate n-doping of a variety of small molecule materials, such as THAP with cobaltocene (CoCp, IE = 4.07 eV), and CuPc, pentacene and C60 with decamethylcobaltocene (CoCp*2; IE=3.30 eV). Orders of magnitude increase in current density in doped devices demonstrate enhanced electron injection and materials conductivity. Applications to the formation of organic p-i-n homojunctions and to the improvement of CuPc/C60 photovoltaic cells are demonstrated.

Host:  Eric Garfunkel

Advancing Nanotechnology - IAMDN New Microscopes


Rutgers new scanning transmission electron microscope and new helium ion microscope help researchers develop nanotechnology used to fight cancer, generate power, and create more powerful electronics. Watch the video to learn more.

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