Busan, South Korea
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Jung K.-S.,Pusan National University | Jung K.-S.,Solvay Group | Lee S.-B.,Pusan National University | Kim Y.-K.,Pusan National University | And 10 more authors.
Journal of Photochemistry and Photobiology A: Chemistry | Year: 2012

This study focuses on the syntheses of N,N-dimethyl-2-thiophenyl-3,4- fulleropyrrolidium iodide (DMFPI), poly N-methyl-2-thiophenyl-3,4- fulleropyrrolidine-co-3-hexylthiophene (MFP-co-3HT), poly N-methyl-2-thiophenyl- 3,4-fulleropyrrolidine-co-3-dodecylthiophene (MFP-co-3DT), and poly N-methyl-2-thiophenyl-3,4-fulleropyrrolidine-co-3-thiopheneacetic acid (MFP-co-3TA) and their photovoltaic properties as hole transporting materials (HTMs) for use in DSSCs. The synthesized DMFPI and copolymers were characterized by 1H NMR, MALDI TOF-mass spectrometry, UV-vis spectroscopy, and cyclic voltammetry. The DSSC devices were fabricated and their photovoltaic performances were measured using a solar simulator under AM 1.5 illumination. © 2012 Elsevier B.V.


Jang Y.-W.,Pusan National University | Jang Y.-W.,Solchem Co. | Kim Y.-K.,Pusan National University | Kim Y.-K.,Solchem Co. | And 10 more authors.
Molecular Crystals and Liquid Crystals | Year: 2011

New TiO2 pastes for the fabrication of TiO2 electrodes at low temperature were prepared from a TiO2 nanoparticle colloidal solution including Ti-alkoxide precursors. In addition, TiO 2 pastes comprising 123nm and 200nm TiO2 particles used as scattering particles were prepared. Single and double layered TiO2 electrodes were deposited onto an ITO-PEN film by the doctor-blade method and subsequently sintered at 140°C and used to fabricate flexible Dye-sensitized Solar Cells (DSSCs). Due to the light scattering effect in the double layered TiO2 electrode, the Jsc and efficiency of the flexible DSSCs were greatly enhanced.


Jung K.-S.,Pusan National University | Jung K.-S.,Solvay Group | Kim Y.-K.,Pusan National University | Kim Y.-K.,Solchem Co. | And 10 more authors.
Molecular Crystals and Liquid Crystals | Year: 2011

This study focuses on the syntheses of zinc 5,10,15,20-tetrakis(p-tolyl) porphyrin (ZnTTP), silicon dichloride 5,10,15,20-tetrakis(p-tolyl)porphyrin (SiCl2TTP), and oxotitanium(IV) 5,10,15,20-tetrakis(p-tolyl)porphyrin (TiOTTP) and their photovoltaic properties as additives for use in electrolytes of the DSSC. In order to investigate photovoltaic effects of the DSSC devices, the FTO/TiO2/N3 Dye/Electrolyte/Pt device was fabricated by using poly (ethylene glycol) (PEG) electrolytes based on TTP metal complexes as an additive. When TiOTTP was introduced into the PEG electrolyte, the power conversion efficiency of DSSC device was shown remarkably a high value compared with values of the others. Copyright © Taylor & Francis Group, LLC.


Kim Y.-K.,Pusan National University | Kim Y.-K.,Solchem Co. | Hwang W.-P.,Pusan National University | Seo M.-H.,Pusan National University | And 2 more authors.
Journal of Nanoscience and Nanotechnology | Year: 2014

Poly(vinylidenefluoride-co-hexafluoropropylene) (PVDF-HFP) nanofibers containing inorganic fillers were fabricated by electrospinning. Dye-sensitized solar cells (DSSCs) using these nanofibers showed improved short circuit currents without degraded fill factors or open circuit voltages. The long-term stabilities of cells using electrospun PVDF-HFP/titanium isopropoxide (TIP) nanofibers were significantly improved. Copyright © 2014 American Scientific Publishers.


Park S.-H.,Pusan National University | Choi H.-J.,Pusan National University | Lee S.-B.,Pusan National University | Lee S.-M.,Pusan National University | And 6 more authors.
Macromolecular Research | Year: 2011

Poly(vinyl alcohol) (PVA) nanofibers were prepared by an electrospinning method using a PVA solution containing silver nitrate (AgNO3) to improve the photovoltaic properties of dye-sensitized solar cells (DSSC). The electrospun PVA nanofibers containing AgNO3 were irradiated with UV light at 310∼380 nm and Ag nanoparticles were generated in their nanofibers. In the DSSC devices using the electrospun PVA/Ag nanofibers, the J sc, V oc, FF, and η showed the values of 11.9∼12.5 mA/cm2, 0.70∼0.71 V, 0.55∼0.59, and 4.73∼4.99%, respectively. When the electrospun PVA/Ag (1 wt%) nanofibers were used in the DSSC device, the power conversion efficiency showed a maximum value of 4.99%, which is higher than that of DSSC using electrospun PVA nanofibers without Ag nanoparticles. © 2011 The Polymer Society of Korea and Springer Netherlands.


Seo M.-H.,Pusan National University | Hwang W.-P.,Pusan National University | Kim Y.-K.,Pusan National University | Kim Y.-K.,Solchem Co. | And 2 more authors.
Conference Record of the IEEE Photovoltaic Specialists Conference | Year: 2011

We fabricated Quantum Dot-Sensitized Solar Cells (QDSSCs) using CdS and CdSe Quantum Dots (QDs) onto mesoporous titanium oxide (TiO 2). The CdS and CdSe QDs used as light absorbing materials are prepared over mesoporous TiO2 electrode by Successive Ionic Layer Adsorption and Reaction (SILAR) process. The growth of the QDs was monitored by UV-visible absorption spectroscopy and the increase of absorption increasing the SILAR cycle numbers was verified. We prepared TiO 2/CdS/CdSe solar cells to introduce a cascade of QD band gaps to facilitate the dissociation of photo-generated excitons in CdSe QDs. We changed platinum counter electrode to gold counter electrode to have the better stability and conductivity with polysulfide electrolyte. Also titanium(IV) isopropoxide (TIP) layer was introduced under mesoporous TiO 2 film as a blocking layer for improving the performance of the cell, especially, photocurrent and open-circuit voltage. © 2011 IEEE.


Lee J.-K.,Pusan National University | Lee S.-M.,Pusan National University | Lee S.-B.,Pusan National University | Kim K.-H.,Pusan National University | And 6 more authors.
Current Applied Physics | Year: 2011

We synthesized two organic dyes, (3-(5-(4-(bis(4-bromophenyl)amino)phenyl) thiophen-2-yl)-2-cyanoacrylic acid (TPA-T1) and 3,3′-(5,5′-(4, 4′-(4-bromophenylazanediyl)bis(4,1-phenylene))bis(thiophene-5,2-diyl)) bis(2-cyanoacrylic acid) (TPA-T2)), which contain the triphenylamine moiety as an electron donor and cyanoacrylic acid moiety as an electron acceptor, connected by thiophene units. Nanocrystalline TiO2-based dye sensitized solar cells (DSSCs) were fabricated using these dyes to confirm the effects of the number of electron acceptors (single or double) on their photovoltaic performance. The DSSC devices based on the TPA-T2 dye showed higher overall efficiencies (η = 2.68-4.11%) than those based on TPA-T1 (η = 2.54-3.46%) due to its the superior optical properties. © 2010 Elsevier B.V. All rights reserved.


Lee S.-M.,Pusan National University | Lee S.-B.,Pusan National University | Kim K.-H.,Pusan National University | Cho S.-E.,Pusan National University | And 6 more authors.
Solar Energy Materials and Solar Cells | Year: 2011

We synthesized the thiophene-based copolymers (P(3TAF-co-3TAa)-A-n and P(3TAF-co-3TAa)-B-n) using two different kinds of thiophene monomers, (N-(3-thienylmethylene)-2-aminofluorene and 3-thiophene acetic acid), as sensitizers on the DSSCs. P(3TAF-co-3TAa)-A-n (n=1, 2, 3) was synthesized with different molar ratios (3TAF:3TAa=1:5, 1:10, 1:20) of monomers at room temperature, respectively. Also, P(3TAF-co-3TAa)-B-n (n=1, 2, 3) was synthesized with above molar ratios of monomers at 0 °C, respectively. The DSSCs devices were fabricated using the thiophene-based copolymers as sensitizers and their photovoltaic performances were measured by using a solar simulator under AM 1.5. In the DSSCs devices using polymeric sensitizers, Voc is 0.530.60 V, Jsc is 1.94.5 mA/cm2, FF is 0.510.63 and the power conversion efficiency is 0.631.53%, respectively. © 2010 Elsevier B.V. All rights reserved.


Park S.-H.,Pusan National University | Won D.-H.,Pusan National University | Won D.-H.,Solchem Co. | Choi H.-J.,Pusan National University | And 7 more authors.
Solar Energy Materials and Solar Cells | Year: 2011

We prepared electrospun polymer nanofibers by the electrospinning method and investigated about their applications to dye-sensitized solar cells (DSSCs). Electrospun poly(vinylidenefluorideco-hexafluoropropylene) (PVDFHFP) and PVDFHFP/polystyrene (PS) blend nanofibers were prepared and examined the uptake, the ionic conductivity, and the porosity by impedance measurement and Scanning Electron Microscope (SEM). The best results of Voc, Jsc, FF, and efficiency of the DSSC devices using the electrospun PVDFHFP/PS(3:1) blend nanofibers were 0.76 V, 11.8 mA/cm2, 0.66, and 5.75% under AM 1.5. © 2010 Elsevier B.V. All rights reserved.

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