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Welcome!

Our research is in the area of materials chemistry and physics of complex, soft materials. Specifically, we are interested in electrically-active polymeric and molecular materials.  We hope to elucidate the fundamental processing-structure-property relationships that govern these materials to generate design rules and guidelines for the rational synthesis of materials with tailored properties and the development of innovative processing and patterning technologies for the realization of low-cost, light weight, mechanically flexible thin-film devices, such as organic transistors and solar cells.

Currently, we are examining how specific processing conditions affect the structure evolution of organic and polymer materials, and how structure development can in turn impact applications-relevant macroscopic electrical and physical properties. Work is being carried out on functional block copolymers, solution-processable organic and polymeric conductors and semiconductors, as well as conjugated self-assembled monolayers.

Keep up to date with publications from the Loo group!

News

05/08/2012 Steph's work guiding crystallization in thin films around bends and corners featured on nano werk
04/27/2012 Jong Bok's work with wrinkles and folds in solar cells featured on EurekAlert
04/24/2012 Steph Lee successfully defends her thesis! Congratulations Dr. Lee!
04/23/2012 Group members featured in Princeton Engineering video
04/23/2012 Jong Bok's article Wrinkles and Deep Folds as Photonic Structures in Photovoltaics published in Nature Photonics
04/12/2012 Steph Lee's article “Orientation-Independent Charge Transport in Single Spherulites from Solution-Processed Organic Semiconductors" featured on the cover of the March 28, 2012 JACS
03/30/2012 Anna Hailey selected as an NSF Graduate Research Fellow -- congrats Anna!
03/16/2012 Princeton highlights our high-temperature flexible transistor work with Takao Someya!
03/06/2012 Lynn selected by the World Economic Forum as a 2012 Young Global Leader -- watch her speak!. Congratulations Lynn!
03/06/2012 Our collaboration with Takao Someya on high thermal stability organic transistors published in Nature Communications
01/12/2012 Anna Hailey and Dr. Jia Gao join the group -- welcome Anna and Jia!

Research Spotlight

Probing Intraspherulite Charge Transport

By testing an array of transistors fabricated on a single solution-processed, organic semiconductor spherulite, we found device mobilities to be independent of the general π-stacking direction of molecules in the active channels. This finding is surprising in light of reports on single-crystal transistors, in which charge transport is reported to be fastest along the π-stacking direction. We conclude that charge transport within spherulites is dominated by shallow traps at low-angle intraspherulite grain boundaries, smearing out any charge transport anisotropies that may exist along different crystallographic directions of the organic semiconductor.  Learn more!