New Organic Donor–Acceptor–π–Acceptor Sensitizers for Efficient Dye‐Sensitized Solar Cells and Photocatalytic Hydrogen Evolution under Visible‐Light Irradiation

Abstract

Two organic donor-acceptor-π-acceptor (D-A-π-A) sensitizers (AQ and AP), containing quinoxaline/pyrido[3,4-b]pyrazine as the auxiliary acceptor, have been. Through fine-tuning of the auxiliary acceptor, a higher designed and synthesized photoelectric conversion efficiency of 6.02% for the AQ-based dye-sensitized solar cells under standard global AM1.5 solar conditions was achieved. Also, it was found that AQ-Pt/TiO2 photocatalysts displayed a better rate of H2 evolution under visible-light irradiation (420 nm<λ<780 nm) because of the stability of the oxidized states and the lower rates of electron recombination. Importantly, sensitizers AQ and AP-Pt/TiO2 showed strong photocatalytic activity during continuous light soaking for 10 h with methanol as the sacrificial electron donor. Additionally, the processes of their intermolecular electron transfer were further investigated theoretically by using time-dependent DFT. The calculated results indicate that the auxiliary acceptor plays the role of an electron trap and results in broad spectral responses.

Efficient Passivation of Hybrid Perovskite Solar Cells Using Organic Dyes with COOH Functional Group

“…AQ has the similar molecular structure with AQ310, but less hydrophobic alkyl chains, [41] and the AQ-treated PSC also exhibited a better PCE of 18.5% for forward scan and 19.1% for reverse scan ( Figure S5, Supporting Information). AQ has the similar molecular structure with AQ310, but less hydrophobic alkyl chains, [41] and the AQ-treated PSC also exhibited a better PCE of 18.5% for forward scan and 19.1% for reverse scan ( Figure S5, Supporting Information).…”

Tuning Thiophene‐Based Phenothiazines for Stable Photocatalytic Hydrogen Production

“…radiation.I nc ontrastw ith the huge literature on DSSC sensitizers, [10,11] few articles have studied the role of the dyes in the photocatalytic production of H 2 .I nt he latter case the mosti mportant families of dyes are the same as in DSSC technology, mostly including organometallic molecules, such as ruthenium complexes, [12,13] porphyrins, or phtalocyanines inspired by the chlorophyll complex. [14] Metal-freeo rganic sensitizers have gained an increasing role in the scientific literature of H 2 production, [15][16][17] with record DSSC powerc onversione fficiencies (PCE) exceeding1 2%. [18][19][20] These dyes carry important advantages over metal complexes, such as easier and cheaper synthesis and purification, larger structural variety, and wider tunability of optical and energetic properties,w hich are fundamental to optimize the corresponding solar devices.…”

An Indacenodithieno[3,2‐b]thiophene‐Based Organic Dye for Solid‐State p‐Type Dye‐Sensitized Solar Cells

“…[2] p-DSCs [3][4][5][6][7] have subsequently attractedi ntensei nterest from scientists owing to their potentiala pplications in tandemd yesensitized solar cells (t-DSCs), [8][9][10][11][12][13][14] as well as in dye-sensitized solar fuel devices (DSSFDs). [15][16][17][18][19][20][21][22][23][24] In 2016, our group fabricated the first solid-state p-DSCs (p-ssDSCs), incorporating an organic dye P1 as the photosensitizer and PCBM as the electron-transport material( ETM), in which we completelya bandoned the liquid redox couple and obtained an impressive photovoltage of 620 mV. [25] With the improved performance of p-ssDSCs, there is potential to build tandem solid-state DSCs (t-ssDSCs), as well as to improve the performanceo fD SSFDsb ys uppressing charge recombination loss between holes in the p-type semiconductor substrate and electrons in the reduced catalysts.…”