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1. Organic Solar Cells* Molecular design and synthesis of new semiconducting polymers for high efficiency polymer solar cells
* Molecular design and synthesis of novel low band-gap conjugated polymers for effective collection of solar energy
* Molecular design and synthesis of solution-processiable small molecules for organic photovoltaics
* Molecular design and synthesis of new hole-transporting materials with enhanced performance for organic/polymer solar cells
* Development of novel methods for large-scale fabrication of polymer solar cells
* Computer simulations for the optimization of organic/polymer solar cells2. Carbon nanotubes (CNTs) and Graphenes for Electronics and Nanocomposites* Modification of CNTs and graphenes for solubility improvement
* Development of graphene-based active materials for organic field-effect transistor
* Development of graphene-based interlayer materials for high efficient organic solar cells
* Development of flexible and transparent electrodes for optoelectronic devices based on CNTs and graphenes
* CNT and graphene-reinforced polymer nanocomposites for enhancement of electrical and mechanical properties

1. Patents* Domestic patents: 16 (organic solar cells, conducting polymer, composite)
* International patents: 4 (conducting polymer)2. Papers* "A high mobility conjugated polymer based on dithienothiophene and diketopyrrolopyrrole for organic
photovoltaics", Energ. Environ. Sci., 5, 6857 (2012)
* "A low band-gap polymer based on unsubstituted benzo[1,2-b:4,5-b ��?-dithiophene for high performance organic
photovoltaics", Chem. Commun., 48, 6933 (2012)
* "Enhanced Performance and Air Stability of Polymer Solar Cells by Formation of a Self-Assembled Buffer Layer
from Fullerene-End-Capped Poly(ethylene glycol)", Adv. Mater., 23, 1782 (2011)
* "Supramolecular Assembly of End-Functionalized Polymer Mixtures Confined in Nanospheres", ACS Nano, 5, 115 (2011)
* "Efficiency enhancement of P3HT/PCBM bulk heterojunction solar cells by attaching zinc phthalocyanine to the
chain-end of P3HT", J. Mater. Chem., 21, 17209 (2011)
* "Enhanced device performance of polymer solar cells by planarization of quinoxaline derivative in a lowbandgap
polymer", J. Mater. Chem., 21, 8583 (2011)
* "Annealing-Free High Efficiency and Large Area Polymer Solar Cells Fabricated by a Roller Painting Process",
Adv. Funct. Mater., 20, 2355 (2010)
* "Fabrication of Highly Conductive and Transparent Thin Films from Single-Walled Carbon Nanotubes Using a
New Non-ionic Surfactant via Spin Coating", ACS Nano, 4, 5382 (2010)
* "Synthesis of Nonfluorinated Amphiphilic Rod-Coil Block Copolymer and Its Application to Proton Exchange
Membrane", Chem. Mater., 22, 3646 (2010)
* "High-Efficiency Polymer Solar Cells with Water-Soluble and Self-Doped Conducting Polyaniline Graft
Copolymer as Hole Transport Layer", J. Phys. Chem. C, 114, 633 (2010)
* "Multi-walled carbon nanotubes covalently attached with poly(3-hexylthiophene) for enhancement of field-effect
mobility of poly(3-hexylthiophene)/multi-walled carbon nanotube composites", Carbon, 48, 389 (2010)
* "Synthesis and photophysical property of well-defined donor-acceptor diblock copolymer based on regioregular
poly(3-hexylthiophene) and fullerene", J. Mater. Chem., 19, 1483 (2009)
[Total of 300 journal papers]