Fabrication and Characterization of On-Stainless Steel Dye-Sensitized Solar Cells and Organic Light-Emitting Diodes
Date Issued
2011
Date
2011
Author(s)
Chen, Yung-Bin
Abstract
In this study, the stainless steel (StSt) foils were applied as flexible substrates for dye-sensitized solar cells (DSSCs) and organic light-emitting diodes (OLEDs). The relationships between various factors and device performances were investigated.
In the first part, porous TiO2 film was fabricated on a StSt substrate by doctor-blade method. To prevent charge recapture by I3-, a evaporated TiO2 film or sputtered Ti film was deposited on StSt surface prior to the fabrication of porous TiO2 film. Then, the sintering of porous TiO2 was taken place at 450℃. Afterwards, the TiO2 electrodes were immersed in N719 dye solution, and assembled with Pt-coated ITO-PET. At last, liquid electrolyte was injected into the assembled cells. The effects of types of StSt, surface roughness of StSt and thickness of porous TiO2 films on the performances of DSSC were studied. Under 100 mW/cm2 (AM1.5) simulated light, the optimal conversion efficiency was 1.04% for SUS 430-based DSSC, and 1.10% for SUS 316L-based DSSC. For SUS 316L-based DSSC, the photocurrent of cells with porous TiO2 layer thickness less than 3.5 μm increased with surface roughness of the substrate. However, for cells with porous TiO2 layer thicker than 3.5 μm, degraded cell performance was observed, which may attribute to the large mismatch of the coefficients of thermal expansion between the StSt substrate and the TiO2 film. Optimal performance was obtained when the porous TiO2 film was about 8~11 μm.
In the second part, A steel-based flexible OLED was fabricated with a configuration of StSt/BCB/ITO/NPB/Alq3/ Cs2CO3(or LiF)/Al. Spin-coated BCB was used as a planarization layer. The OLED was then encapsulated with a SiO2-coated PET film. The device exhibited similar I–V characteristics under bending.
Subjects
Stainless steel substrate
DSSC
OLED
Type
thesis
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