Recent progress in dye sensitized solar cell materials and photo-supercapacitors: A review

Electrochromic materials (ECMs) change their colored state with changes in potential. When applied as an energy storage device, they reveal the current state of charge using intrinsic properties al...

Systematic Design of Electrochromic Energy Storage Devices Based on Metal–Organic Monolayers

Anchoring groups play an important role in the structure of dyes by determining the charge injection efficiency and the bonding degree between the sensitizer and the semiconductor surface. In this work, two new 2D–π–2A-type metal-free organic dyes S1 and S2 with bipyridine anchoring groups were synthesized and applied in dye-sensitized solar cells (DSSCs). The IR spectra indicated that the two dyes could anchor on the Lewis acid sites of the TiO2 surface through the bipyridine anchoring group, and the bidentate configuration was conducive for improving the electron injection efficiency and enhancing the dye adsorption stability. In addition, since phenothiazine and carbazole are often used as electron donors in DSSCs, in this work, we also compared their different effects on the photoelectric properties in detail. The DSSC based on S1 showed PCE of 4.39% under AM 1.5G irradiation and Voc of 708 mV, Jsc of 9.39 mA cm−2, and FF of 65.99%, while the DSSC based on S2 showed PCE of 2.96%; the main reason for these results is that their Voc and Jsc values were very different. We also studied the dye loading amounts, optical properties, electrochemical properties, and photovoltaic performances to analyze the differences between the two devices.

New 2D–π–2A organic dyes with bipyridine anchoring groups for DSSCs

DFT and TD-DFT studies of phenothiazine based derivatives as fluorescent materials for semiconductor applications

A bio-inspired family of organic dyes with bichromic-bipodal architectures were synthesized and tested in dye-sensitized solar cells (DSSC). These dyes are comprised of a D-π-D-A motif with two triphenylamine (TPA) units acting as donors (D) and two cyanoacetic acid acceptors (A) capable of binding to a titania semiconductor. The role of the thiophene π-spacer bridging the two TPA units was examined and the distal TPA (relative to TiO2) was modified with various substituents (-H, -OMe, -SMe, -OHex, -3-thienyl) and contrasted against benchmark L1. It was found that the two TPA donor units could be tuned independently, where π-spacers can tune the proximal TPA and R-substituents can tune the distal TPA. The highest performing DSSCs were those with -SMe, 3-thienyl, and -H substituents, and those with one spacer or no spacers. The donating abilities of R-substituents was important, but their interactions with the electrolyte was more significant in producing high performing DSSCs. The introduction of one π-spacer provided favourable electronic communication within the dye, but more than one was not advantageous.

Exploring Structure-Property Relationships in a Bio-Inspired Family of Bipodal and Electronically-Coupled Bistriphenylamine Dyes for Dye-Sensitized Solar Cell Applications.

A family of four bipodal triphenylamine-based dyes, three of which incorporate two triphenylamine (TPA) units, have been studied to understand their potential in light-harvesting applications. Compared to previously reported TPA-based dyes, these exhibit improved device performance. Theoretical calculations correlate excited state dipole moments to device efficiency.

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Bipodal dyes with bichromic triphenylamine architectures for use in dye-sensitized solar cell applications

Bichromic bipodal triphenylamine-based dyes with high photo-electron conversion at low light intensities

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Bipodal dyes with bichromic triphenylamine architectures for use in dye-sensitized solar cell applications

Bichromic bipodal triphenylamine-based dyes with high photo-electron conversion at low light intensities