Cherie R Kagan Research Group

Electrical and Systems Engineering - Chemistry - Materials Science and Engineering

Group Photo 2014

Welcome

The Kagan group explores the chemical and physical properties of nanostructured and organic materials and integrates these materials in electronic, optoelectronic, optical, thermoelectric and bioelectronic devices. We combine the flexibility of chemistry and bottom-up assembly with top-down fabrication techniques to design novel materials and devices. We explore the structure and function of these materials and devices using spatially- and temporally-resolved optical spectroscopies, AC and DC electrical techniques, electrochemistry, scanning probe and electron microscopies and analytical measurements.

Research Highlights

4/30/2015:
Binary and Ternary Superlattices Self-Assembled from Colloidal Nanodisks and Nanorods

We demonstrate novel binary and ternary superlattices self-assembled from two colloidal anisotropic nanocrystals: two-dimensional nanodisks and one-dimensional nanorods. By changing the relative size and concentration of LaF3 nanodisks and CdSe/CdS nanorods, we synthesized AB2-type, AB6-type, two AB-type binary superlattices, lamellar-type binary structure as well as an ABC-type ternary superlattice, This work demonstrates shape-engineered nanocrystals can be used to access new phases/structures, which allows for the design of novel functional metamaterials by tailoring superlattice structures.

3/27/2015:
Deposition of Wafer-Scale Single-Component and Binary Nanocrystal Superlattice Thin Films Via Dip-Coating

Our DOE SISGR team demonstrates large-area assembly of single component and binary nanocrystal superlattices over large wafer scales by dip-coating.

3/10/2015:
Smectic Nanorod Superlattices Assembled on Liquid Subphases: Structure, Orientation, Defects, and Optical Polarization

Our DOE SISGR team demonstrates control over the orientation of smetic B superlattices of CdSe/CdS dot-in-rod nanocrystals by assembly on different polar liquid subphases to yield nearly quantitative vertical to horizontal alignment. We show the optical absorption polarization depends on the structure of the assembled superlattices.

1/16/2015:
Electron and hole transport in ambipolar, thin film pentacene transistors

We fabricated solution-processed, ambipolar, thin-film pentacene field-effect transistors to study both electron and hole transport simultaneously in a single, organic solid-state device. We show that the lower electron than hole mobility is consistent with greater energetic disorder and therefore a greater density of localized tail states for electrons than holes.

Announcements

5/01/2015:
Congratulations to our Graduating Students!

Our graduating students will be continuing their education:
  • Emily - PhD program in MSE at Univ. of Michigan
  • Devika - PhD program in MSE at UT Austin
  • Matt - PhD program in EE at UC Berkeley
  • Prashanth - PhD program in EE at Univ. of Utah
  • Chawit - PhD program in Integrated in Photonic and Electronic Systems at Cambridge University

4/19/2015:
Congratulations Yu Yao!

Yu Yao has been selected to receive the Masters Scholar Award from Materials Science and Engineering.

4/23/2015:
Congratulations Emily

Emily Gurniak has been awarded the R. M. Brick Award, named for the first chairman of the Department of Materials Science and Engineering, and awarded to the graduating senior who has demonstrated through a combination of academic performance, effort, and personal qualities that he or she will be a credit to the Department, the School, and the University.

4/21/2015:
Congratulations Cherie!!

Cherie has been been awarded the S. Reid Warren, Jr. Award for outstanding service in stimulating and guiding the intellectual and professional development of undergraduate students.

4/11/2015:
Congratulations to SJ!

SJ has just been appointed an Assistant Professor of Materials Science and Engineering at Korea University

4/09/2015:
Congratulations to Yuming!

Yuming has been awarded the S. J. Stein Prize, awarded to a Ph.D. or M.S.E. degree recipient for superior achievement in the field of new or unique materials or applications for materials in electronics. This prize acknowledges that achievement and encourages continued interest in this important field.

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Copyright © 2014 Kagan Research Group, University of Pennsylvania
Electrical & Systems Engineering, Moore Building
200 South 33rd Street, Philadelphia, PA 19104