Solar cells sensitized by donor-linked concerted companion dyes

Abstract

Donor-linked concerted companion dyes have been synthesized for fabricating solar cells. The results indicate that a longer linking chain is favorable for improving the proportion of double anchoring, resulting in superior photovoltaic performance.

Efficient Solar Cells Based on Porphyrin and Concerted Companion Dyes Featuring Benzo 12-Crown-4 for Suppressing Charge Recombination and Enhancing Dye Loading

“…After 500 h of visible-light irradiation, the PCEs of the DSSCs sensitized by porphyrin dye XW91 using I 3 – /I – and Co 3+/2+ electrolytes decreased to 89.9 and 89.2% of the respective initial values. Whereas, the PCEs of the corresponding devices for CC dye XW92 were decreased to 93.7 and 92.3% of the respective initial values, further demonstrating that CC dyes containing double anchor groups have superior stability compared to the corresponding porphyrin dyes with a single anchor …”

“…Whereas, the PCEs of the corresponding devices for CC dye XW92 were decreased to 93.7 and 92.3% of the respective initial values, further demonstrating that CC dyes containing double anchor groups have superior stability compared to the corresponding porphyrin dyes with a single anchor. 43 ■ CONCLUSIONS Based on our previously reported D−π−A type porphyrin dye XW43 which possesses two DEG units-substituted phenothiazine donor, a BCE unit has been introduced onto the N atom of the phenothiazine donor. Meanwhile, the 7-phenyl moiety attached on the phenothiazine unit has been substituted with one or two DEG chains or a second 12-crown-4 unit to afford XW89−XW91.…”

“…Hence, enhancing the spectral response is vital for developing efficient DSSCs. In this respect, cosensitization is an effective approach by using two dyes with complementary absorption spectra to achieve panchromatic absorption. ,– Despite their success in this regard, both the cocktail and the sequential cosensitization methods require time-consuming optimization of the dye adsorption processes. , To simplify the optimization process and control the distribution of the two dyes on TiO 2 , we have developed concerted companion (CC) dyes by covalently linking a porphyrin dye unit and an organic dye unit with complementary absorption characters. – The constructed CC dyes feature a panchromatic spectral response in the visible region and excellent adsorption stability, achieving improved photovoltaic performance. Thus, on the basis of XW91 , a CC dye XW92 has been constructed by linking the porphyrin dye unit of XW91 and the organic dye unit of XL3 (Figure ).…”

Panchromatic porphyrin-based dye-sensitized solar cells: from cosensitization to concerted companion dye approaches

“…[124][125][126][127][128][129] On this basis, a novel class of concerted companion dyes (CC dyes) have been developed for fabricating more efficient DSSCs by linking a porphyrin sub-dye unit with an organic one (Table 9). [130][131][132][133][134][135][136] Xie and coworkers synthesized a series of concerted companion dyes XW60-XW63 (Fig. 23a) by linking the acceptor units of a porphyrin XW51 and an organic dye Z2 units with flexible alkoxy chains.…”

Sensitizers of Metal Complexes with Sulfur Coordination Achieving a Power Conversion Efficiency of 12.89%

“…Research on dye sensitizers has continued in recent years and different types of dye sensitizers have been developed. − The most important dye sensitizers which have been extensively studied are metal complex and pure organic compound dye sensitizers . Recently, research shows that the maximum power conversion efficiency (PCE) of organic dye sensitizers such as indole dye is up to 12.45% and that of triarylamine dye sensitizers reaches 15.2% through co-sensitizing. , The maximum PCE of metal complex dye sensitizers such as ruthenium complex dyes is 11.5%, − osmium complex dye is 8.85%, Zn porphyrin dyes is 13%, and the Zn porphyrin dyes co-sensitized with organic dyes of thiophene-indole is 14.2% .…”