1P-6 : Study on the synthesis of polymers containing carbazole groups as new hole transporting material and their molecular weight effect on the performance of solid-state dye-sensitized solar cell

In this study, the poly[N-(2-ethylhexyl)-3,6-carbazole-alt-aniline] (PI) and poly{bis-[6-bromo-N-(2-ethylhexyl)-carbazole-3-yl]-alt-aniline} (PII) with different molecular weight (Mw) were synthesized and used as new hole transport materials (HTM) in the solid-state dye-sensitized solar cell (ssDSSC) and their Mw effect on performance of the device will also be studied. The polymers were synthesized and fractionated to separate high Mw of 6,780g/mol, 17,413g/mol and low Mw of 1,786g/mol, 2,238g/mol for PI and PII. The polymers showed good thermal stability (450°C), depth HOMO (5.0 eV). The effect of Mw was investigated by using different Mw of polymers and applying into ssDSSC, the high Mw shows the performance about 0.4% and 0.01% for PI and PII while the low Mw shows 1.5% and 0.05% of the performance of PI and PII. Success in synthesized PI and PII by Pd-catalyzed polycondensation method and applied into ssDSSC as HTM. The polymers show as a promising candidate for ssDSSC.