Research

Our research programs center on the electronic, chemical, structural and electrical properties of materials relevant to thin-film electronic devices. Our research spans a range of semiconductor materials (elemental and compounds), but our current focus is on organic molecular and polymer semiconductors and on hybrid organic inorganic perovskites. We study their electronic properties, their interfaces with metals, metal oxides and organic thin films, for applications in organic and thin film electronics. Our group is particularly interested in engineering materials and interfaces that improve the performance of devices, organic light emitting diodes (OLEDs), field effect transistors (OFETs), organic or hybrid photovoltaic cells (PVs), and other thin-film devices applicable to large-area, flexible electronics.

The quasi-infinite possibilities for chemical synthesis of new molecular compounds, combined with the unmatched ease of fabrication of organic and hybrid semiconductor films by vacuum evaporation, liquid processing or printing on a variety of substrates, give these materials key advantages over standard inorganic semiconductor materials, and open tremendous opportunities for innovation in device structures. Our research spans fundamental issues of, 

  • electron-hole interaction in molecular semiconductors
  • chemistry and electronic structure of metal-organic and organic-organic heterojunctions
  • physics, implementation and impact of chemical (n- and p-) doping to control
  • conductivity and carrier injection

Our group is involved in extensive collaborations with synthetic chemists, theoreticians, and device physicists in the US, Asia, and Europe, in academia, national laboratories, and industry. Our approach involves a variety of spectroscopic techniques for determining electronic structures, charge carrier transport measurements, morphological and structural tools, and device fabrication.

 

Recent Publications: 

Beating the thermodynamic limit with photo-activation of n-doping in organic semiconductors, Xin Lin, Berthold Wegner, Kyung Min Lee, Michael A. Fusella, Fengyu Zhang, Karttikay Moudgil, Barry P. Rand, Stephen Barlow, Seth R. Marder, Norbert Koch and Antoine Kahn. Nat. Mater. DOI: 10.1038/NMAT5027 (2017) (PDF)

Investigation of the High Electron Affinity Molecular Dopant F6-TCNNQ for Hole-Transport Materials, Fengyu Zhang and Antoine Kahn. Adv. Funct. Mater. 1703780 (2017) (PDF)

Mixed-halide perovskites with stabilized bandgaps, Zhengguo Xiao, Lianfeng Zhao, Nhu L. Tran, Yunhui (Lisa) Lin, Scott H. Silver, Ross A. Kerner, Nan Yao, Antoine Kahn, Gregory D. Scholes, Barry P. Rand, Nature Materials (submitted 04/03/17)

Pairing of near-ultraviolet solar cells with electrochromic windows for smart management of the solar spectrum, Nicholas C. Davy, Melda Sezen, Jia Gao, Xin Lin, Amy Liu, Antoine Kahn and Yueh-Lin Loo, Nature Energy, 2, 17104 (2017) (PDF)

Electronic structure of the CsPbBr3/polytriarylamine (PTAA) syste, James Endres, Michael Kulbak, Lianfeng Zhao, Barry P. Rand, David Cahen, Gary Hodes, and Antoine Kahn, J. Appl. Phys. 121, 035304 (2017) (PDF)

High-Work-Function Molybdenum Oxide Hole Extraction Contacts in Hybrid Organic–Inorganic Perovskite Solar Cells, Philip Schulz, Jan O. Tiepelt, Jeffrey A. Christians, Igal Levine, Eran Edri, Erin M. Sanehira, Gary Hodes, David Cahen, and Antoine Kahn, ACS Appl. Mater. Inter. 8, 31491 (2016)(PDF)

Valence and Conduction Band Densities of States of Metal Halide Perovskites: A Combined Experimental–Theoretical Study, James Endres, David A. Egger, Michael Kulbak, Ross A. Kerner, Lianfeng Zhao, Scott H. Silver, Gary Hodes, Barry P. Rand, David Cahen, Leeor Kronik, and Antoine Kahn, J. Phys. Chem. Lett. 7, 2722 (2016) (PDF)

Morphological Tuning of the Energetics in Singlet Fission Organic Solar Cells, YunHui L. Lin, Michael A. Fusella, Oleg V. Kozlov, Xin Lin, Antoine Kahn, Maxim S. Pshenichnikov, and Barry P. Rand, Adv. Func. Mat., 26, 6489 (2016) (PDF)

Electronically Passivated Hole‐Blocking Titanium Dioxide/Silicon Heterojunction for Hybrid Silicon Photovoltaics, Gabriel Man, Jeffrey Schwartz, James C. Sturm and Antoine Kahn, Adv. Mat. Int. 3.15 (2016) (PDF)

P-doped organic semiconductor: Potential replacement for PEDOT:PSS in organic photodetectors, J. Herrbach, A. Revaux, D. Vuillaume and A. Kahn. Appl. Phys. Lett. 109, 073301 (2016) (PDF)

Impact of a Low Dopant Concentration on the Distribution of Gap States in a Molecular Semiconductor, Xin Lin, Geoffrey E. Purdum, Swagat K. Mohapatra, Stephen Barlow, Seth R. Marder, Yueh-Lin Loo and Antoine Kahn, Chem. Mat. 28, 2677 (2016) (PDF)

Solution-processed dopant F4-TCNQ as interlayer in polymer solar cells, F. Guillain, J. Endres, L. Bourgeois, A. Kahn, L. Vignau and G. Wantz, ACS Appl. Mat. Interf. 8, 9262 (2016) (PDF)

Revisiting the Valence and Conduction Band Size Dependence of PbS Quantum Dot Thin Films, Elisa M. Miller, Daniel M. Kroupa, Jianbing Zhang, Philip Schulz, Ashley R Marshall, Antoine Kahn, Stephan Lany, Joseph M. Luther, Matthew C. Beard, Craig L Perkins, and Jao van de Lagemaat, ACS Nano, 10, 3302 (2016) (PDF)

Determination of energy level alignment within an energy cascade organic solar cell, James Endres, Barry P. Rand, Antoine Kahn, Chem. Mat. 28, 794 (2016) (PDF)

Contorted Hexabenzocoronenes with Extended Heterocyclic Moieties Improve Visible Light Absorption and Performance in Organic Solar Cells, Nicholas C Davy, Gabriel Man, Ross Kerner, Michael Fusella, Geoff Purdum, Melda Sezen, Barry Rand, Antoine Kahn and Yueh-Lin Loo, Chem. Mat. 28, 673 (2016) (PDF)

Experimental Characterization of Interfaces of Relevance to Organic Electronics, Gabriel Man, James Endres, Xin Lin and Antoine Kahn, in WSPC Reference on Organic Electronics, Jean-Luc Brédas and Seth R. Marder, edts., World Scientific, chapt. 6, p. 159-191 (2016)

Fermi level, work function and vacuum level, A. Kahn, Materials Horizons, 3, 7-10 (2016) (PDF)