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A new type of multibenzyloxy-wrapped porphyrin sensitizers for developing efficient dye-sensitized solar cells
摘要： Porphyrin dyes have been widely used for the fabrication of efficient dye-sensitized solar cells (DSSCs). However, dye aggregation and charge recombination still exert negative effects on photovoltaic performance, resulting in unsatisfactory power conversion efficiencies (PCE). Herein, we report a new class of porphyrin sensitizers XW52 and XW53 employing four benzyloxy groups to wrap the porphyrin cores. As a result, an efficiency of 7.6% was obtained for XW52, with Voc and Jsc of 668 mV and 16.63 mA cm-2, respectively. Compared with XW52, an additional 2,6-dialkoxyphenyl group has been introduced to the N-atom of the phenothiazine donor to furnish XW53 with the aim to further improve the anti-aggregation character and the solubility, and thus the Voc was improved to 674 mV, and a higher efficiency of 7.9% was achieved for XW53. Upon cosensitization with PT-C6, the Voc and Jsc were synergistically enhanced to 727 mV and 18.67 mA cm-2, respectively. As a result, a high efficiency of 9.6% was successfully achieved for the cosensitization system of XW53 + PT-C6. These results provide an effective novel strategy for designing efficient porphyrin dyes by introducing multiple benzyloxy groups to the meso-phenyl groups.
关键词： cosensitization,porphyrins,dye aggregation,dye-sensitized solar cells,wrapped structures
更新于2025-09-12 10:27:22
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π-Extended <i>cis</i> -Configured Unsymmetrical Squaraine Dyes for Dye-sensitized Solar Cells: Panchromatic Response
摘要： Light absorbing sensitizer is the heart of the third generation photovoltaic technologies such as dye-sensitized solar cells (DSSC). Despite possessing large extinction coefficients for the metal free organic dyes, the light harvesting efficiency is limited with the narrow absorption profile in either visible or NIR regions of the solar spectrum. Though monolayer formation of organic sensitizers on semiconducting metal oxide surface leads to dye-dye interaction that leads to broadening the absorption profile, the contribution of aggregated state to the power conversion process is found out to be poor. Here we have engineered far red active π-extended cis-configured unsymmetrical squaraine dyes with carboxylic acid and cycnoacetic acid as anchoring groups with controlled aggregation and panchromatic light absorption by including the steric and electronic factors. The presence of sp3-C (out of plane) and N-alkyl (in plane) groups played an important role in modulating the assembly the dyes on the TiO2 electrode, cis-squaraine unit helps to extend the conjugation in the NIR region besides enhancing the visible transition and the incident photon-to-current conversion efficiency (IPCE) profile showed the importance of anchoring groups for the panchromatic response. Dye PSQ10 showed solar-to-electric conversion with an onset of 850 nm with the device performance of 7.0% (Voc = 0.581 V, Jsc = 17.06 mA/cm2, FF = 70 %).
关键词： cis-Squaraine dyes,panchromatic response,dye-sensitized solar cells,extended far-red absorption,dye aggregation
更新于2025-09-12 10:27:22