2-(4-Butoxyphenyl)-<i>N</i>-hydroxyacetamide: An Efficient Preadsorber for Dye-Sensitized Solar Cells

Aung, Su Htike; Hao, Yan; Oo, Than Zaw; Boschloo, Gerrit

doi:10.1021/acsomega.7b00267

Cited by 14 publications

(11 citation statements)

References 27 publications

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“…In particular, triphenylamine-based dyes have attracted interest thanks to the ease of synthesis, high extinction coefficients and broad absorption spectra, good photostability and temperature stability, and other features making them highly efficient photosensitizers. ,,− So far, the highest reported uncertified power conversion efficiencies (PCEs) of over 14% have been achieved for silyl-anchoring carbazole dye ADEKA-1 with the application of hierarchical molecular passivation, with the use of acids comprising alkyl chains of different lengths, − which prevented electron recombination. In recent years, many different passivation techniques have been studied, including molecular ,− and atomic covering layers. − However, to the best of our knowledge, there are very few systematic studies on molecular titania surface passivation and its effects on different charge transfer processes. Therefore, we have undertaken a study of the impact of several interface modifications, like the use of a dye anchoring unit, molecular capping, and encapsulation as well as alternate use of copper and cobalt complexes on the partial charge transfer steps occurring on time scales from femtoseconds to seconds.…”

Section: Introductionmentioning

confidence: 99%

Interface Modification and Exceptionally Fast Regeneration in Copper Mediated Solar Cells Sensitized with Indoline Dyes

et al. 2020

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The photovoltaic performance of solar cells sensitized with indoline D205 dye and its new derivative comprising an alkoxysilyl anchoring unit (D205Si) in the [Cu(tmby) 2 ](TFSI) 2/1 (tmby = 4,4′,6,6′tetramethyl-2,2′-bipyridine, TFSI = bis(trifluoromethane)sulfonimide) redox couple mediated systems was studied in the presence of various titania/dye/electrolyte interface modifications. Cucurbit[7]uril (CB7) was employed to encapsulate dye molecules, creating an electronically insulating layer, suppressing electron interception by redox mediator, and leading to the increase in the electron lifetime in the titania conduction band. For example, the electron lifetime increased from 2.2 to 6.5 ms upon CB7 encapsulation of D205 cells at 0.9 V voltage. Further, molecular multicapping was optimized to minimize dye desorption and prevent electron recombination. As a result, photovoltaic performance was found to be enhanced by the interface modifications in most cases, especially when applied to the alkoxysilyl anchoring derivative. The charge transfer processes (dye regeneration, titania-dye and titania-redox mediator recombination) in the above-mentioned system and in the reference [Co(bpy) 3 ](TFSI) 3/2 (bpy = 2,2′-bipyridine) redox couple mediated systems were investigated by means of small light perturbation electron lifetime measurements, electrochemical impedance spectroscopy, and nanosecond and femtosecond transient absorption spectroscopies. Indoline dyes were also found to be outstandingly fast regenerated by the Cu-based mediator (time constant shorter than 100 ns), which may open new opportunities for sensitizer improvements.

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Section: Introductionmentioning

confidence: 99%

Interface Modification and Exceptionally Fast Regeneration in Copper Mediated Solar Cells Sensitized with Indoline Dyes

et al. 2020

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“…The Voc increasing is due to the occupation of the vacant spots of the semiconductor surface that were not touched by the dye alone in a higher concentration of the co-adsorbent in the simultaneous manner. Thereby, the charge recombination with the redox couple is retarded [13] while the enhancement of Jsc is related to the light absorption between 300 and 600 nm, according to Fig. 3 (a).…”

Section: Resultsmentioning

confidence: 94%

“…Among them, the use of co-adsorbents has been very effective. Co-adsorbents are substances that can be adsorbed simultaneously onto the semiconductor surface of DSSCs in a competition with dye molecules, occupying the vacant sites on the semiconductor surface uncovered by dye molecules to depress CR [11, 12, 13]. In most cases, they are organic amphiphilic molecules containing anchoring groups such as carboxylic or phosphonic groups.…”

Section: Introductionmentioning

confidence: 99%

Improving the effective photovoltaic performance in dye-sensitized solar cells using an azobenzenecarboxylic acid-based system

Mazloum-Ardakani

Arazi

2019

Heliyon

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In this research, an azobenzenecarboxylic acid was used as a sufficient co-adsorbent in combination with N719 dye. As it is found from the results, an optimized concentration of the co-absorbent leads to the highest efficiency. The dye-sensitized solar cells (DSSCs) parameters such as short-circuit current (Jsc), open-circuit voltage (Voc) and conversion efficiency (η) were obtained -14.87 mA/cm 2 , 0.765 V and 5.20% respectively. Based on the results, the N719/Azobenzenecarboxylic-based system shows a significant increase in Voc and Jsc, resulting in an ∼21% improvement in the efficiency. A higher conversion efficiency for the co-adsorbent-based systems was assigned to their enhanced η, which is attributed to reduced dye aggregation, higher electron injection and increased Voc. This corresponded to the improved electron density in the TiO 2 conduction band of the photoanode and reduced charge recombination revealed through electrochemical impedance spectroscopy measurements. Also, evidence was provided for a long charge life time and a high resistance of charge recombination for the co-absorbed solar cells.

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“…Therefore, we speculate that the reason behind the lower loading of DB in the T202-DB co-sensitized film might be only due to a complementary size relationship between the co-sensitized dyes, where T181 has a more suitable shape and size than T202 which make the former dye fit better within the voids of the adsorbed DB dye molecules. It is important to note here that we did not increase the DB concentration in the T202-DB film bath above 0.03 mM to increase its loading amount mainly because the DB is very prone to aggregation, 27 and therefore any higher concentration would greatly and negatively affect our DSSC efficiency measurements. Based on the above results it is suggested that site selective adsorption was achieved when co-sensitizing T181 or T202 with DB.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Large Enhancement of Dye Sensitized Solar Cell Efficiency by Co-sensitizing Pyridyl- and Carboxylic Acid-Based Dyes

hilal

Nehme

Ghaddar

2018

ACS Appl. Energy Mater.

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Co-sensitization is an attractive approach to enhance the light-harvesting efficiency of a dye sensitized solar cell (DSSC), whereby two or more dyes having complementary absorption spectra are co-adsorbed within a DSSC. A new method of co-sensitizing simultaneously pyridyl- and carboxylic acid-based dyes was performed and proved to be a successful approach for increasing the photoconversion efficiency (PCE%) of a DSSC. Yellow and red pyridyl-based dyes (T181 and T202) were co-sensitized with a blue carboxylic acid-based dye (Dyenamo Blue, DB). The co-sensitized DSSCs showed profound performance enhancements with a cobalt tris(bipyridine) electrolyte system. Increases in the total cell efficiency of 45% and 16% were seen in the co-sensitized T181-DB and T202-DB cells when compared to the single dye-sensitized DB cell, respectively. Remarkable increases in photocurrent (J sc) and photovoltage (V oc) were seen in both co-sensitized cells. The higher V oc values were mainly due to the decrease in the electron recombination processes at the TiO2/cobalt electrolyte interface. The increase in dye coverage in the co-sensitized cells resulted in a blocking behavior at the TiO2/electrolyte interface and had positive effects on electron lifetime. In addition the higher J sc values were associated with the complementary absorption responses of T181 and T202 with DB as mirrored in the IPCE% spectra.

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2-(4-Butoxyphenyl)-N-hydroxyacetamide: An Efficient Preadsorber for Dye-Sensitized Solar Cells

Cited by 14 publications

References 27 publications

Interface Modification and Exceptionally Fast Regeneration in Copper Mediated Solar Cells Sensitized with Indoline Dyes

Interface Modification and Exceptionally Fast Regeneration in Copper Mediated Solar Cells Sensitized with Indoline Dyes

Improving the effective photovoltaic performance in dye-sensitized solar cells using an azobenzenecarboxylic acid-based system

Large Enhancement of Dye Sensitized Solar Cell Efficiency by Co-sensitizing Pyridyl- and Carboxylic Acid-Based Dyes

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