Substitution of a hydroxamic acid anchor into the MK-2 dye for enhanced photovoltaic performance and water stability in a DSSC

Abstract

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Carbazole Dye‐Sensitized Solar Cells Studied from Femtoseconds to Seconds—Effect of Additives in Cobalt‐ and Iodide‐Based Electrolytes

“…Thus, partial recombination occurring on a picosecond timescale has a clear impact on the performance of DSSCs. This observation is in agreement with a few recent reports in which lower or higher recombination in the sub‐nanosecond range for different organic dyes was correlated with better or worse performance of the cells prepared with these dyes 8–9. 12c–e However, to the best of our knowledge, no detailed investigation of this recombination mechanism has been reported so far.…”

“…As can be seen from these results, the excited state of the dye shows absorption bands with maxima at λ ≈600, 750, and 920 nm. The apparent presence of the first two maxima is probably due to the negative stimulated emission band that appears between them (reported maximum of λ ≈680 nm8). Below λ =550 nm the negative bleaching signal dominates.…”

“…On the other hand, our contribution shows, for the first time (to the best of our knowledge, for any DSSC), how TBP and Li + additives influence initial fast recombination dynamics. Such unwanted process occurring between electrons in titania and oxidized dyes on the sub‐nanosecond timescale have been recently observed for many efficient DSSCs sensitized with organic dyes 8–9. 11c, 12 This means that there is still room for further improvement of DSSC systems based on such dyes, if fast recombination can be minimized or suppressed.…”

“…Henceforth, it has been investigated for different reasons, including the manufacture of high‐efficiency cells with novel cobalt complexes,5 application in solid‐state devices,6 and for long‐term stability 7. Various derivatives of this successful dye have also been studied to improve stability in a humid environment,8 and understand the effect of varying alkyl chains on the recombination process 9. Recently, a derivative of MK‐2, ADEKA1, reached an impressive value of over 12 % efficiency 10.…”

Photoelectrochemical Cells Utilizing Tunable Corroles

“…15 With PCl 8 -1 still maintaining a 660 ps singlet state lifetime, similar to other organic dyes such as MK-2 that are used in highly efficient DSSCs, its photophysical properties are suitable for photoinduced electron-transfer processes. 21 Thus, with the flexibility of corroles appearing to surpass that of porphyrins, molecular engineering of corroles is possible to tune properties for photoelectrochemical applications. Specifically, P-1…”