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2019.05.17 09:34

[May 23. 2019] Molecular Engineering for Organic Electronics and Synchrotron X-rays

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Speaker Prof. Hyojung Kim (Pusan National University)
Date Thu. 23 May. 2019
Time 5:00pm
Venue #331, Asan Hall, College of Science

Molecular Engineering for Organic Electronics and Synchrotron X-rays

 

We present molecular engineering for Organic Photovoltaics (OPVs) in conjugated polymer systems with fs-laser, molecular templating growth (MTG) with graphene, and solvent engineering. In case of poly(3-hexylthiophene)(P3HT) films, face-on favorable nanostructure formed by fs-laser irradiation. The dipole moment of P3HT could align along the electric field of irradiated laser, which induced face-on stacking of P3HT polymers in the films. The vertical charge current increased in the fs-laser irradiated region due the enhancement of face-on stacking. [1-4]

For the face-on favorable stacking of P3HT polymers, we adopted dry transferred graphene as a templating layer. In contrast to conventional PMMA-assisted wet transferred wet transferred graphene, dry transferred graphene is found in the current work to be quite suitable for use in the roll-to-roll process due to its lack of PMMA residue, whose removal would require high-temperature annealing. When we produce a P3HT film with a thickness of 30 nm, the face-on populations of P3HT were prominent on both the dry and wet transferred graphene layers. As the film thickness is increased to 50 nm, the face-on population decreased on the wet transferred graphene surface, but retained high levels on the dry transferred graphene.

Finally, we tried to control crystallinity of P3HT layer by solvent to form ideal BHJ (bulk heterojunction) structure in Sequential (Sq) process for OPVs. In the Sq process, a bi-layered structure is formed by the sequential deposition of the acceptor and donor layers, and the final BHJ nanostructure is formed at the interface between the layers by carrying out an additional procedure involving thermal annealing and swelling. We investigated the inter-diffusion of acceptor material at the interface in different crystalline structured layers as a function of gradual thermal annealing. We found that the P3HT films made using a low-boiling-point solvent had fewer crystalline regions and lots of amorphous regions, which enabled fullerene molecules to readily penetrate into P3HT layer within a short period of time.

We took Grazing-Incidence Wide-Angle X-ray Scattering (GIWAXS) and NEXAFS (Near Edge X-ray Absorption Fine structure) based on synchrotron x-rays for detail structural studies.

 

 

References

[1] S. Chae, K. H. Jo, S. W. Lee, H.-S. Geum, H. J. Kim, J. Choi, H. H. Lee, Macromol. Chem. Phys. 217, 537-543 (2016).

[2] S. Chae, A. Yi, C. M. Park, W. S. Chang, H. H. Lee, J. Choi, H. J. Kim, ACS Appl. Mater. Interfaces 9, 24422-24427 (2017).

[3] S. Chae, K. Jo, S. J. Won, A. Yi, J. Choi, H. H. Lee, J. H. Kim, H. J. Kim, Adv. Mater. Interfaces 4, 1701099 (2017).

[4] S. Chae, A. Yi, H. H. Lee, J. Choi, H. J. Kim, Journal of Materials Chemistry C (2018, in printing).

 


List of Articles
No. Subject Speaker Date
Notice Spring semester 2019 Seminar Schedule file - -
68 Fall semester 2016 Seminar Schedule file - -
67 Spring semester 2017 Seminar Schedule file - -
66 [Fri. 17 Mar. 2017] 9th RINS Symposium file - Fri. 17 Mar. 2017
65 [Thu. 27 Apr. 2017] Seminar was canceled! - -
64 [Wed. 5 July. 2017] Seminar is canceled! - -
63 7th Jilin-Korea-Waseda Alliance Annual Symposium file - August 17 ~ 19, 2017
62 Fall semester 2017 Seminar Schedule file - -
61 Fall semester 2018 Seminar Schedule file - -
60 [October 10, 2017] Novel Terahertz Spectroscopies file Director Mischa Bonn Tue, October 10, 2017
59 [August 14. 2019] Principle of Semiconductor Quantum Cascade Laser and It’s Application to Chemical Gas Detection file Dr. Byeong-il Seo(Agency for Defense Development) Wed. 14 August. 2019
58 [October 25, 2017] Ultrafast electron microscopy: applications in chemical and materials sciences Dr. Byung-Kuk Yoo October 25, 2017
57 [March 5. 2019] Innovation@Agilent file Dr. Darlene Solomon (Agilent Technologies Inc.) Tuesday. 5 March. 2019
56 [May 16. 2019] Nano Structure Analysis by Synchrotron Small Angle X-ray Scattering Technique Dr. Hyungjoo-An (Pohang Accelerator Laboratory) Thu. 16 May. 2019
55 [Fri. 13 Oct. 2017] Dr. J. Nathan Hohman/The Molecular Foundry, Lawrence Berkeley National Laboratory, California, USA Dr. J. Nathan Hohman Fri. 13 Oct. 2017
54 [March 20, 2019] Challenges in molecular dynamics simulations of unfolded proteins and protein-DNA complexes file Dr. Jejoong Yoo March 20, 2019
53 [Thu. 26 Oct. 2017] Dr. Jung-Nyoung Heo/Center for Medicinal Chemistry Research, Korea Research Institute of Chemical Technology, Daejeon, Korea Dr. Jung-Nyoung Heo Thu. 26 Oct. 2017
52 [October 15. 2019] A more sustainable chemistry with elemental sulfur file Dr. Thanh Binh Nguyen(Institut of Natural Product Chemistry) Tue. 15 October. 2019
51 [Thu. 13 Apr. 2017] Dr. Wan Ki Bae/Photoelectronic Hybrid Research Center, Korea Institute of Science and Technology, Seoul, Korea Dr. Wan Ki Bae Thu. 13 Apr. 2017
50 [Mon. 13 Oct. 2016] Prof. Amir H. Hoveyda/Multicomponent Catalytic Synthesis of Organoboron Compounds for Scalable Natural Product Synthesis Prof. Amir H. Hoveyda Monday 13 October 2016
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