Metal-free branched alkyl tetrathienoacene (TTAR)-based sensitizers for high-performance dye-sensitized solar cells

Yamuna, Ezhumalai; Lee, Byunghong; Fan, Miao; Harutyunyan, Boris; Prabakaran, Kumaresan; Lee, Chuan‐Pei; Chang, Shih-Yu; Ni, Jen‐Shyang; Vegiraju, Sureshraju; Priyanka, Pragya; Wu, Ya Wen; Liu, Chia Wei; Yau, Shuehlin; Lin, Jiann T.; Wu, Chun Guey; Bedzyk, Michael J.; Chang, Robert P. H.; Chen, Ming Chou; Ho, Keang-Po; Marks, Tobin J.

doi:10.1039/c7ta01825h

Cited by 57 publications

(37 citation statements)

References 40 publications

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“…Notably, the spectra of both dyes were red‐shifted on the TiO 2 film compared with those in solution. We attribute the red‐shifted cutoff absorption to intermolecular interactions on the TiO 2 surface, which are likely to occur because of the presence of a TiO 2 layer . The maximum molar absorption coefficients ( ε max ) were 29 042 and 28 295 m −1 cm −1 for ZL003 and ZL005, respectively.…”

Section: Resultsmentioning

confidence: 95%

Electron‐Withdrawing Anchor Group of Sensitizer for Dye‐Sensitized Solar Cells, Cyanoacrylic Acid, or Benzoic Acid?

Zhang

Yang

et al. 2019

Solar RRL

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High electron‐injection efficiency is important for further development of dye‐sensitized solar cells (DSSCs). Different electron acceptors have different electron‐injection capabilities, which affect device performance. Herein, the effects of two organic triazatruxene (TAT)‐based donor‐π‐bridge‐acceptor sensitizers applied in DSSCs are reported. The sensitizers have either rigid 4‐ethynyl benzoic acid (EBA) or Z‐type cyanoacrylic acid (CA) as their electron acceptor, denoted as ZL003 and ZL005, respectively. Time‐resolved photoluminescence (TR‐PL) spectroscopy is applied to reveal the electron transfer dynamics between the sensitizers and TiO2 films. Notably, ZL003 has higher electron‐injection efficiency compared with that of ZL005, which is consistent with the higher efficiency and photocurrent of devices based on the former. The dye loading of ZL003 is nearly twice as great as that of ZL005, which accounts for the lower photocurrent of the device. The charge recombination lifetimes for the two dyes are consistent with their open‐circuit voltage. Consequently, the ZL003‐based devices achieve a higher power conversion efficiency of 13.4% compared with only 7.2% for ZL005.

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Section: Resultsmentioning

confidence: 95%

Electron‐Withdrawing Anchor Group of Sensitizer for Dye‐Sensitized Solar Cells, Cyanoacrylic Acid, or Benzoic Acid?

Zhang

Yang

et al. 2019

Solar RRL

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“…Numerous of photosensitizers for Dye‐Sensitized Solar Cells (DSSCs) have been reported since DSSC was first reported by Grätzel in 1991 . The studies on organic dyes for DSSCs have attracted wide attention for their low cost, low toxicity, easy structural modification, and high power conversion efficiency . Many excellent organic dyes have been developed and exhibited good photovoltaic properties, such as porphyrin dyes, N ‐annulated perylene dyes, and many different kinds of rigidified aromatics dyes, etc .…”

Section: Methodsmentioning

confidence: 99%

Low‐Cost, High‐Efficiency, and Efficiency Predictable Small Molecule Organic Dyes with Bis(4‐styryl)phenyl Amino Donor for Dye‐Sensitized Solar Cells

Ying¹,

Liu²,

Li³

et al. 2019

Solar RRL

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Three small molecule organic dyes (SMODs) with bis(4‐styryl)phenyl amino (BSPA) donor FWD4∼FWD6 are synthesized easily and applied as sensitizers for dye‐sensitized solar cells (DSSCs). The dipole moments (µ) of FWD4∼FWD6 are calculated by using density functional theory (DFT) to be 7.49, 9.64, and 9.22 D, respectively. The DSSCs based on FWD4∼FWD6 exhibit high power conversion efficiencies (η) of 5.83%, 7.62%, and 7.39%, respectively. The linear regression equation η = 0.817 µ–0.370 is created with R2 = 0.999 that reveals the equation owned high accuracy. Highly reliable linear equations are also obtained under different fabrication conditions, which indicates that the power conversion efficiency tendency is influenced only by these dyes’ intrinsic property, the dipole moment. The excellent linear correlation between the dipole moment and power conversion efficiency indicates that it is very likely to predict the power conversion efficiency precisely by calculating the dipole moment, which gives a convenient way to connect the experimental results with theoretical calculations for dyes with similar molecular structures.

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“…The Nyquist plots show charge transport resistances (R tr ) at the first small semicircles [32] and electron recombination resistance (R rec ) at the second semicircles, [33] which represent the impedances of interfacial charge transfer at the Pt/electrolyte interface and theTiO 2 /dye/electrolyte interfaces, respectively. DSSCs based on SL201 and SL202 used the same electrode and electrolyte, leading to the values of the R tr at high frequency being approximate, with SL201 and SL202 of 13.45 Ohm and 9.98 Ohm, respectively.…”

Section: Electrochemical Impedance Spectroscopymentioning

confidence: 99%

Effect of Different Site Trifluoromethylbenzoic Acid Organic Photosensitizer for Dye‐sensitized Solar Cells

Shen

Yang

et al. 2021

ChemistrySelect

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Two novel D-A-π-A triazatruxene (TAT)-based photosensitizers with different acceptor, namely SL201 and SL202, respectively, have been successfully synthesized and applied in dyesensitized solar cells (DSSCs). The trifluoromethyl as strong electron-withdrawing group was introduced to different sites of benzoic acid, in order to enhance the electron-withdrawing ability of the acceptor, broaden the light capture ability and improve power conversion efficiency (PCE) of the DSSCs. Due to the steric hindrance effect, the molecular planarity of the trifluoromethyl group at different positions in the molecule is different, which leads to different photovoltaic performance of DSSCs. Finally, the DSSCs based on SL202 obtain a higher PCE of 9.8 %, short-circuit current density (J sc ) of 15.3 mA/cm 2 , an open-circuit voltage (V oc ) of 927 mV and a fill factor (FF) of 0.69, compared with 9.0 % of SL201, using Co 2 + /Co 3 + complex redox couple under standard AM 1.5G solar irradiation (100 mW/cm 2 ). The same chemical group at different positions will produce different molecular planarity, further causing different photovoltaic performance of devices.

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Metal-free branched alkyl tetrathienoacene (TTAR)-based sensitizers for high-performance dye-sensitized solar cells

Abstract: New branched alkyl tetrathienothiophene (TTAR)-based organic sensitizers with power conversion efficiency up to 11%.

Cited by 57 publications

References 40 publications

Electron‐Withdrawing Anchor Group of Sensitizer for Dye‐Sensitized Solar Cells, Cyanoacrylic Acid, or Benzoic Acid?

Electron‐Withdrawing Anchor Group of Sensitizer for Dye‐Sensitized Solar Cells, Cyanoacrylic Acid, or Benzoic Acid?

Low‐Cost, High‐Efficiency, and Efficiency Predictable Small Molecule Organic Dyes with Bis(4‐styryl)phenyl Amino Donor for Dye‐Sensitized Solar Cells

Effect of Different Site Trifluoromethylbenzoic Acid Organic Photosensitizer for Dye‐sensitized Solar Cells

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