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Detailed Program
Paper Number : NA-O03 |
Time Frame : 14:20~14:32 |
Presentation Date : Friday, 28, November |
Session Name : Nano-particles & Nano-structured Materials |
Session Chair 1# : Hae Jin Hwang |
Session Chair 2# : Tohru Sekino |
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Solid state dye sensitized solar cell using TiO2 blocking layer deposited by atomic layer deposition |
Yun-Jeong KIM |
Chungnam National University |
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Keywords: ssDSSC, ALD, NCD, Blocking layer
In these latter days, the declining of the world oil production and increasing global temperature are caused global warming. It means that we need the development of renewable energy source. Solid - state dye sensitized solar cells (ssDSSC) are shown to be the appealing source for economical and effective switch over solar photons to electricity. A typical ssDSSC includes a dye sensitizer in which excitons are induced by light absorption. Generally, ssDSSC is consisted of bottom electrode, a blocking layer, a mesoporous nano crystalline Tin Oxide (TiO2), monolayer of dye molecules, electrolyte, and the counter electrode. In this study, we are going to produce a thinner cell with a TiO2 blocking layer using atomic layer deposition (ALD) process with excellent step coverage. The TiO2 blocking layer can block the electron back reaction effectively, both from Fluorine doped Tin Oxide (FTO) and TiO2 surface.
First, FTO substrate is deposited by TiO2 blocking layer using Nano Cluster Deposition (NCD) which the crystallinity at low temperature (140 ~ 160 ¡É) is possible. The blocking properties of the TiO2 deposited using ALD and NCD technique were compared. Then, TiO2 mesoporous layer, dye (CH3NH3PbI3) and hall transition materials (Spiro - MeOTAD) are coated by spin coating techniques. Finally, the Au top electrode is deposited using direct current (DC) sputtering system.
X – Ray diffraction (XRD) was used to investigate whether dye is crystallized or not and scanning electron microscopy (SEM) to verify the correct thickness and image of surface. Also, the optical characteristics are measured for confirming transmittance from bottom electrode to TiO2 in samples.
Finally, efficiency of the cells was measured using cells in the presence or absence of the blocking layer using ALD and NCD process on FTO substrate by solar simulator at 1.5 Air Mass (AM) and 1000 W/m2.
References:
[1] J.Pys. Chem. Lett. 2014, 5, 1374-1379
[2] Adv. Mater. 2014, 26, 4309.4312 |
Acknowledgements : |
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