Group Members

Frisbie_Research_Group

Graduate Students

Motao Cao

cao.jpg  Graduate Student

 Education:
 B.Sc. Materials Science and Engineering, Zhejiang Univeristy, Hangzhou, China; 2013

 Emailcaoxx422@umn.edu

 Research: Photonic Sintering of Aerosol-Jet-Printed Inorganic Semiconductor Thin Films

 Solution processed Inorganic semiconductor materials have broad potential applications in printing electronics due to their high intrinsic carrier mobility and good environmental stability. However, high annealing temperature (350C) and long annealing time (1h) of semiconductor thin film have been the obstacles for fabrication of printed electrolyte gated transistors (EGTs) on flexible substrate. In this project, we applied photonic sintering to anneal the aerosol jet printed inorganic semiconductor thin film at relative low temperature and short annealing time. Photonic sintering achieves fast heating and fast cooling of the film by giving off pulsed intense light. Fast annealing of the printed film can be achieved without doing damage to flexible substrate. We are looking for a suitable inorganic semiconductor for both photonic sintering and aerosol jet printing and exploring a stable way to obtain a dense and homogeneous semiconductor thin film at low temperature

Selected Publications:

  1. "Low-Temperature Combustion-Synthesized Nickel Oxide Thin Films as Hole-Transport Interlayers for Solution-Processed Optoelectronic Devices." Bai, Sai, Motao Cao, Yizheng Jin, Xingliang Dai, Xiaoyong Liang, Zhizhen Ye, Min Li. Advanced Energy Materials, 2014, 4, no. 6

Krystopher Jochem

 Krystopher_Jochem Graduate Student

 Education:
 B.Sc. Chemical Engineering, Purdue University, West Lafayette, Indiana; 2015

 Email: joche002@umn.edu

 Research: Printed Electronics and Roll-to-Roll UV Micromolding

 Printing demonstrates great promise for the fabrication of electronic devices due to its low cost, additive nature, and compatibility with continuous manufacturing.  By combining UV-micro imprinting with inkjet printing, our group has increased the resolution and aspect ratio (Height/Width) of printed features through the SCALE process (Self-aligned. Capillarity Assisted Lithography for Electronics).  I am currently working on the optimization of a roll-to-roll UV imprinting process for creating micron scale, high aspect ratio features on a plastic web for SCALE as well as the improved fabrication of printed metal conductors through the SCALE process.

Xinglong Ren

ren.jpg  Graduate Student

 Education:
 
B.Sc. Shanghai Jiaotong University; 2013

 Email: renxx225@umn.edu

 Research: Charge Transport in Organic Semiconductor Single Crystals

 Organic single crystals are ideal system for investigating the intrinsic transport behavior in organic semiconductors. I am working on improving charge transport in organic semiconductor single crystals by device structure optimization. In addition, I am also interested in understanding the structure-property relationship of organic semiconductors by designing and characterizing new organic molecules.

 

Mathew Thomas

thomas_mathew_v2.jpeg  Graduate Student

 Education:
 B.Sc. Chemical Engineering, IIT, Madras, 2015

 Email: thom5471@umn.edu

 Research: Printed Electronic Biosensors

 My project uses printed floating gate thin film transistors and microfluidics to create biosensors - devices used to detect the presence of biologically important targets. The aim of my research is to understand the working mechanism of these devices, improve their sensitivity, and test new targets in different media.

Yan Wang

Yan_Wang  Graduate Student

 Education:
 
B.E., M.E. in Materials Science and Engineering, Beihang University, Beijing, China

 Email: wang5502@umn.edu 

 Research: Gate-Tunable Electrochemical Devices

 Understanding and controlling interfacial electrochemical phenomena is key to optimizing energy conversion and storage devices. In my doctoral research, I work on back-gated electrochemical devices that utilize electrostatic charging (induced by a gate bias) to control electrochemical reactions on two-dimensional materials. By investigating how the band alignment and electronic occupation at the electrode/electrolyte interface affect electrochemical processes, this work will facilitate rational design of electrode materials.

Fazel Zare Bidoky

 Fazel_Zare_BidokyGraduate Student

 Education:
 B.Sc. Mechanical Engineering and Chemistry, Sharif University of Technology, Tehran, Iran; 2013

 M.Sc. Chemistry, University of MInnesota, Minneapolis, MN; 2015

 Email: zareb001@umn.edu

 Research: Enhancement of Printed Polymer Electronic Performance

 Flexible electronics are nowadays drawing attentions because of their high device density and ability to be integrated into wearable health monitoring systems. To this goal one important step is to fabricate devices on flexible substrates rather than silicon or sapphire, which requires new device structures and materials, namely, new conductors, semiconductors, and dielectrics. Polymers, with their vast and interesting tunable properties, are promising candidates for this application. The goal of this research is to use polymer-based inks to print different electrical devices and circuits including inverters, ring oscillators, etc. Previously, transistors and inverters with good performance were made in the group using ion-gel as the dielectric. Fabricating more complex circuits, enhancing their dynamic and static performances, and developing new printing methods are the research areas I am currently working on.

Selected Publications:

  1. Zare Bidoky, F., Hyun, W.J., Song, D. and Frisbie, C.D., 2018. Printed, 1 V electrolyte-gated transistors based on poly (3-hexylthiophene) operating at> 10 kHz on plastic. Applied Physics Letters, 113(5), p.053301. 
  2. Zare Bidoky, F. and Frisbie, C.D., 2016. Parasitic Capacitance Effect on Dynamic Performance of Aerosol-Jet-Printed Sub 2 V Poly (3-hexylthiophene) Electrolyte-Gated Transistors. ACS applied materials & interfaces, 8(40), pp.27012-27017.
  3. Hyun, W.J., Bidoky, F.Z., Walker, S.B., Lewis, J.A., Francis, L.F. and Frisbie, C.D., 2016. Printed, Self‐Aligned Side‐Gate Organic Transistors with a Sub‐5 µm Gate–Channel Distance on Imprinted Plastic Substrates. Advanced Electronic Materials, 2(12), p.1600293.

Postdocs

Tao He

tao_he.png Postdoc

 Education:
 Postdoc, Institut für Organische Chemie, Universität Würzburg, Germany; 2012 - 2014

 M.Sc. and Ph. D., State Key Laboratory of Crystal Materials, Shandong University, China; 2012

 Email: the@umn.edu

 Research: Crystal defects by Scanning Kelvin Probe Microscopy; Electric double-layer transistor on organic single crystals.

 Selected Publications:

  1. He, T.; Wu, Y.; D'Avino, G.; Schmidt, E.; Stolte, M.; Cornil, J.; Beljonne, D.; Ruden, P. P.; Würthner, F.; Frisbie1, C. D.*, Crystal Step Edges Can Trap Electrons on the Surfaces of n-Type Organic Semiconductors. Nat. Commun. 2018, 9, 2141.
  2. He, T.; Stolte, M.; Burschka, C.; Hansen, N. H.; Musiol, T.; Kälblein, D.; Pflaum, J.; Tao, X., Brill, J. and Würthner, F.*, Single-crystal field-effect transistors of new Cl2-NDI polymorph processed by sublimation in air. Nat Commun 2015, 6, 5954.
  3. He, T.; Stolte, M.; Würthner, F.*, Air-Stable n-Channel Organic Single Crystal Field-Effect Transistors Based on Microribbons of Core-chlorinated Naphthalene Diimide. Adv. Mater. 2013, 25, 6951-6955.
  4. He, T.; Zhang, X.; Jia, J.; Li, Y.; Tao, X.*, Three-Dimensional Charge Transport in Organic Semiconductor Single Crystals. Adv. Mater. 2012, 24, 2171-2175.

 

 

Quyen Van Nguyen

Quyen_Van_Nguyen Postdoc

 Education:

 Postdoc, Le laboratoire Interfaces Traitements Organisation et DYnamique des Systèmes – ITODYS, Université Paris Diderot, France; 2018

 Ph.D, Le laboratoire Interfaces Traitements Organisation et DYnamique des Systèmes – ITODYS, Université Paris Diderot, France; 2018

 Email: qnguyen@umn.edu

Research: Molecular electronic, Nanoelectrochemistry, Molecular Plasmonic, Atomic Force Microscopy

Selected Publications: 

  1. Quyen Van Nguyen, Pascal Martin, Denis Frath, Maria Luisa Della Rocca, Frederic Lafolet, Sebastien Bellinck, Philippe Lafarge, and Jean-Christophe Lacroix. “Highly Efficient Long-Range Electron Transport in a Viologen-Based Molecular Junction” J. Am. Chem. Soc., Article ASAP, DOI: 10.1021/jacs.8b05589.
  2. Denis Frath, Quyen Van Nguyen, Fréderic Lafolet, Pascal Martin, Jean-Christophe Lacroix “Electrografted monolayer based on a naphthalene diimide–ruthenium terpyridine complex dyad: efficient creation of large-area molecular junctions with high current densities”, Chem. Commun, 2017, 53, 10997-11000 (Inside Front Cover ).
  3. Quyen Van Nguyen, Pascal Martin, Maria Luisa Della Rocca, Clément Barraud, Philippe Lafarge, Denis Frath, Frederic Lafolet, Vineetha Mukundan, David James, Richard L. McCreery, Jean-Christophe Lacroix “Control of rectification in molecular junctions: Contact effects and molecular signature”, J. Am. Chem. Soc. 2017, 139 (34), 11913–11922.
  4. M. Tefashe, Quyen Van Nguyen, Frederic Lafolet, Jean-Christophe Lacroix, Richard L. McCreery , “Robust Bipolar Light Emission and Charge Transport in Symmetric Molecular Junctions” J. Am. Chem. Soc. 2017, 139, 7436-7439. (Editor’s choice in Science)

 

Zuoti Xie

zuotixie.jpgPostdoc 

 Education:

 Postdoc, Weizmann Institute of Science; 2009-2011

 Ph.D Organic Electronics, Fudan University; 2009

 Email: zxie@umn.edu

 Research: Organic Electronics

 From a fundamental perspective, the goal of molecular electronics is to understand the connection between the molecular structure and the conductivity of molecular wires. We use conducting probe atomic force microscopy (CP-AFM) to contact small numbers of molecules to test their electrical properties. Based on the experimental data, we use a well established analytical model to depict electronic structures of the molecular junction including effective energy offset for charge transport and moelcule-electrode coupling. We are looking for an efficient method to captures the essential transport physics in these systems.

 Selected Publications:

  1. Effect of Heteroatom Substitution on Electronic Coupling in Alkane Dithiol Based Molecular Junctions. Zuoti Xie, Stuart Oram, Christopher E. Smith, Yanfei Wu, Ioan Bâldea, and C. Daniel Frisbie, ACS Nano 2017, 11, 569
  2. Large Magnetoresistance at Room Temperature in Organic Molecular Tunnel Junctions with Non-Magnetic Electrodes. Zuoti Xie, Sha Shi, Feilong Liu, Darryl L. Smith, P. Paul Ruden, and C. Daniel Frisbie, ACS Nano 2016, 10, 8571
  3. Experimental and Theoretical Analysis of Charge Transport in Oligophenylene Dithiol Junctions as a Function of Molecular Length and Contact Work Function. Zuoti Xie, Ioan Bâldea, Christopher Smith, Yanfei Wu, and C. Daniel Frisbie, ACS Nano 2015, 9, 8022.
  4. Uncovering a Law of Corresponding States for Electron Tunneling in Molecular Junctions. Ioan Bâldea,  Zuoti Xie, and C. Daniel Frisbie, Nanoscale 2015, 7, 10465.