Synthesis of New Type Aromatic Organic Material and Applications on Dye-Sensitized Solar Cells
Date Issued
2014
Date
2014
Author(s)
Chou, Po-Ting
Abstract
In chapter 2, we have described the synthesis of a series of metal-free organic dyes containing phenylene-thiophene-phenylene (PSP) as conjugated spacer attached with various tert-butyl substituted arylamines as donor and cyanoacetic acid as acceptor for DSSCs studies. Presence of tert-butyl group in the donor unit not only suppressed intermolecular aggregation but also helped in reducing charge recombination rate. Compared to other dyes discussed in this chapter, the dye CB-PSP exhibited maximum overall conversion efficiency (6.70 %) with short-circuit photocurrent density (Jsc) of 14.63 mA‧cm-2 and open-circuit photovoltage (Voc) of 0.685 V. For dye CB-PSP, the observed maximum photon-to-current conversion efficiency (IPCE) was more than 80% in the region of 420~480 nm. We have used CDCA (chenodeoxycholic acid) as co-adsorbent in order to demonstrate the effect of tert-butyl group for inhibition of dye-aggregation. By using CDCA, the overall performance was decreased as CDCA reduced the dye loading amount on TiO2. This observed result indicated that tert-butyl group effectively inhibited the dye-aggregation on TiO2 surface.
In chapter 3, we have described the synthesis and studies of a series of organic oligo-dyes for DSSCs applications based on non-conjugated phenothiazine both as donor and spacer. As the geometry of phednothiazine is not planer, the dyes containing phenothiazine unit are expected to reduce the rate of charge recombination and dye-aggregation. All dyes discussed in this chapter exhibited an open-circuit photovoltage (Voc) more than 0.78 V under the AM 1.5 solar condition (100 mW∙cm-2). The overall conversion efficiencies of dyes followed the order dimer > monomer > trimer. The dye PT2b showed maximum efficiency (7.78 %) by using DCA as co-adsorbent with short-circuit photocurrent density (Jsc) of 14.3 mA‧cm-2, open-circuit photovoltage (Voc) of 0.83 V and fill factor (FF) of 0.65.
In chapter 4, we have demonstrated the synthesis and studies of dyes containing 1,3-indandione-5,6-dicarboxylic acid as an electron acceptor in place of commonly used conventional cyanoacetic acid. For these dyes, substituted triphenylamines have been used as donor units. The strong electron withdrawing nature of 1,3-indandione shifted the absorption maxima towards higher wavelength of these simple D-π-A systems. The dyes 1 and 2, showed about 100 nm red shift in their absorption maxima as compared to analogous 2-cyano-3-(4-(diphenylamino)phenyl)acrylic acid (TPA) which we have used as reference dye for comparison. The dye 2 exhibited maximum efficiency of 2.51 % in presence of DCA (100 mM) with short-circuit photocurrent density (Jsc) of 6.86 mA‧cm-2, open-circuit photovoltage (Voc) of 0.58 V and fill factor (FF) of 0.63.
Subjects
染敏化太陽能電池
二氧化鈦
第三丁基
吩噻嗪
1,3-茚二酮-5,6-雙羧酸
Type
thesis
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