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Triphenylamine Phthalocyanine Based Sensitizer for Dye Sensitized Solar Cell Applications
| Content Provider | Semantic Scholar |
|---|---|
| Abstract | In the previous chapter, we have constructed DSSC devices based on Zinc (II) phthalocyanine complexes functionalized by substitutions at the non-peripheral positions. In these devices we have used strong electron donating bulky tert-butylbenzenethiol groups to enhance the optical response rendering more harvesting of photons. The DSSC device constructed using this sensitizer had shown good thermal stability and exceptional optical response among all the phthalocyanine sensitizers explored so far but still the efficiency parameters were still not good for commercial applications. The reason for rather modest efficiency values was probably due to the weak sensitization of the TiO2 semiconductor because of lack of directionality in the excited state, rather than dye aggregation, as demonstrated by the detrimental effect of CDCA co-adsorbent. Computational analyses also suggested that the bulky tert-butyl substituent, although preventing dye aggregation, also contribute some hindrance to the dye interaction with the semiconductor surface. The phthalocyanine macrocycles are quite unusual owing to the multiloop aromatic structure and electronic spectral features therefore very judicious design of the sensitizer is required to get optimum performance of the solar cells. In the previous work (chapter 5), we have realized that too much steric crowding though reduces aggregation but optimum hindrance should be there so that there could be no problem in anchoring of the dye. One more way of enhancing the device performance is by improving the phthalocyanine absorption in the 400-600 nm regions. Organic chromophore that absorb in this region can be attached to the peripheral positions in such a way that extended ļ°-conjugation can be achieved thereby resulting in broader absorption from 300-700 nm region. The synthesized organic-phthalocyanine hybrid |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://shodhganga.inflibnet.ac.in/bitstream/10603/24941/12/12_chapter_7.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
