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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
Solid state dye sensitized solar cell using TiO2 blocking layer deposited by atomic layer deposition
Yun-Jeong KIM
Chungnam National University
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 :