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Tran Viet Toan, the school of Materials Science has received the best poster award in the International Symposium on Frontiers of Materials Science 2013 (ISFMS2013)

Tran Viet Toan, a third-doctoral student of the school of Materials Science (Murata Lab), has received the best poster award in the International Symposium on Frontiers of Materials Science 2013 (ISFMS2013). This symposium is organized on the basis of the joint Vietnam-German Symposium on Frontiers in Materials Science previously held in Hanoi, Vietnam (2010) and Frankfurt am Main, Germany (2011). The award is given by the Vietnam Physical Society at the University of Engineering and Technology to participating students that present best and most interesting research posters.

[Prized Date]
November 19, 2013
[Prized Title]
Solar Cell and Transistor Devices with Naphthodithiophene-Based Polymers
Polymer solar cells (PSCs) based on blends of conjugated polymers and fullerene derivatives are now recognized as a promising approach for future renewable energy production because of their low production cost, mechanical flexibility, and solution processability. Development of a new low-band gap polymer, high hole mobility, and control over nanoscale morphologies of interpenetrating donor/acceptor networks play important roles to enhance the performances of PSCs . To obtain the low-bandgap polymers and modulate their electronic properties, the use of donor-acceptor system (D-A) in the semiconducting materials has become an efficient strategy. Here, we demonstrate the synthesis and characterization of two novel semiconducting copolymers based on naphthodithiophene and dithiophene diketopyrrolo pyrrole and their applications to bulk heterojunction polymer solar cells (BHJ PSCs) and field-effect transistors (FETs). The naphthodithiophene based polymers exhibit a low optical bandgap of ̴ 1.35 eV with the high field-effect hole motility of 2.77  10-2 cm2/(Vs). The BHJ PSCs fabricated from blend of polymers and [6,6]-phenyl-C61-butyric acid methyl ester (PC61BM) yielded the PCEs of 3.38% and 3.76% under AM 1.5 G irradiation (100mW/cm2) for N12 and Z12, respectively.
First of all, I would also like to thank to Prof. Hideyuki Murata, Dr. Varun Vohra, Dr. Dao Thanh Toan and Murata Lab members for their supports and encouragement for my research. I would like to thank to Prof. Kazuo Takimiya and Assoc. Prof. Itaru Osaka for the collaboration in gel permeation chromatography characterization. I'd like to acknowledge the financial support by the project 322 scholarship from the Vietnam Government. Finally, I would like thank the ISFMS2013 for organizing and the award.

Mr. Tran Viet Toan

February 13, 2014