Browse > Article
http://dx.doi.org/10.3365/KJMM.2010.48.04.363

Coating Properties of a TPD Organic Hole-transporting Layer Deposited using a Continuous slot-die Coating Method  

Chung, Kook Chae (Korea Institute of Materials Science)
Kim, Young Kuk (Korea Institute of Materials Science)
Choi, Chul Jin (Korea Institute of Materials Science)
Publication Information
Korean Journal of Metals and Materials / v.48, no.4, 2010 , pp. 363-368 More about this Journal
Abstract
N,N'-diphenyl-N,N'-bis(3-methylphenyl)1-1' biphenyl-4,4'-diamine (TPD) hole-transporting layers were deposited using a continuous slot-die coating method on ITO/PET flexible substrates. It is crucial that the substrates have a very smooth surface with a RMS roughness of less than 2 nm for the deposition of semiconductor nanocrystals or Quantum Dots. The parameters of the slot-die coating, including the solution concentration of the TPD, the gap between the slot-die and the substrates, and the coating speed were controlled in these experiments. To obtain full coverage of the TPD films on the ITO/PET substrates (40 mm wide and several meters long), the injection rates of the TPD solution were increased proportional to the coating speed of the flexible substrates. Additionally, the injection rates must be increased as the gap distance changes from 400 to 600 ${\mu}m$ at the same coating speed. A RMS surface roughness of less than 2 nm was obtained, in contrast to bare ITO/PET substrates, at 13 nm, as the coating speed and gap distance increased.
Keywords
optoelectronic materials; coating; surface; AFM; roughness;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
Times Cited By SCOPUS : 0
연도 인용수 순위
1 W. K. Bae, J. Kwak, J. W. Park, K. Char, C. Lee, and S. Lee, Adv. Mater. 21, 1690 (2009)   DOI   ScienceOn
2 S. Coe-Sullivan, J. Stecker. W. K. Wolo, M. Bawendi, and V. Bulovic, Adv. Funct. Mater. 15, 1117 (2005)   DOI   ScienceOn
3 S. Cae, W. K. Woo, M. Bawedi, and V. Bulovic, Nature 420, 800 (2002)   DOI   ScienceOn
4 L. A. Kim, P. Anikeeva, S. Coe-Sulivan, J. Steckel, M. Bawendi, and V. Bulovic, Nano Lett. 8, 4513 (2008)   DOI   ScienceOn
5 Uri Banin, Nature Photonics 2, 209 (2008)   DOI   ScienceOn
6 J. Caruge, J. halpert, V. Bulovic, and M. Bawendi, Nano Lett. 6, 2991 (2006)   DOI   ScienceOn
7 Y. J. Choi, S. H. Ha, K. J. Park, Y. Choe, and Y. R. Cho, J. Kor. Inst. Met. & Mater. 47, 873 (2009)
8 J. Zhao, Bardecker, A. Munro, M. Liu, Y. Niu, J. Ding, J. Luo, B. Chen, A. Jen, and D. Ginger, Nano Lett. 6, 463 (2006)   DOI   ScienceOn