Metal‐Free Sensitizers Containing Hydantoin Acceptor as High Performance Anchoring Group for Dye‐Sensitized Solar Cells

Guo, Fuling; Li, Zhao-Qian; Liu, Xuepeng; Zhou, Li; Kong, Fantai; Chen, Wangchao; Dai, Songyuan

doi:10.1002/adfm.201601305

Cited by 54 publications

(19 citation statements)

References 30 publications

(25 reference statements)

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“…( A ) The “misc” category includes various dyes based on pyrazoline, naphthoquinone, N,N-dialkylaniline 105 , julolidine 106 , bithiazole 107 , cyclohexadiene 108 etc. ( B ) The “misc” category includes dyes with anchoring groups that include thiazolidine 73 , aldehyde, hydantoin 109 , isophorone 71 , phosphonic acid and pyrimidine 110 . Numbers on the right are the counts of cases found in each category.…”

Section: Resultsmentioning

confidence: 99%

Prediction of Absorption Spectrum Shifts in Dyes Adsorbed on Titania

Venkatraman

Yemene

Mello

2019

Sci Rep

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Dye adsorption on metal-oxide films often results in small to substantial absorption shifts relative to the solution phase, with undesirable consequences for the performance of dye-sensitized solar cells and optical sensors. While density functional theory is frequently used to model such behaviour, it is too time-consuming for rapid assessment. In this paper, we explore the use of supervised machine learning to predict whether dye adsorption on titania is likely to induce a change in its absorption characteristics. The physicochemical features of each dye were encoded as a numeric vector whose elements are the counts of molecular fragments and topological indices. Various classification models were subsequently trained to predict the type of absorption shift i.e. blue, red or unchanged (|Δλ| ≤ 10 nm). The models were able to predict the nature of the shift with a good likelihood (~80%) of success when applied to unseen data.

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Section: Resultsmentioning

confidence: 99%

Prediction of Absorption Spectrum Shifts in Dyes Adsorbed on Titania

Venkatraman

Yemene

Mello

2019

Sci Rep

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“…J SC is directed by the incident photo‐to‐electron conversion efficiency (IPCE) based on the following equation

J_{sc} = \int IPCE (λ) e {normal∅}_{ph, AM 1.5 G} (λ) d (λ)

and e refers to the elementary charge, whereas

{normal∅}_{ph, AM 1.5 G}

is the photo flux under the standard illumination of AM 1.5G, 100 mW cm −2 . Moreover, IPCE is a function of wavelength ( λ ), and it is influenced by the parameters of light harvesting efficiency (LHE; the ratio between the collected photogenerated charges and the number of incident photons) and internal quantum efficiency (IQE) with the formula of

IPCE (λ) = LHE (λ) \times IQE (λ)

…”

Section: Importance Of Interfacial Engineering In Pscsmentioning

confidence: 99%

Review on Practical Interface Engineering of Perovskite Solar Cells: From Efficiency to Stability

et al. 2019

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Exceptionally high efficiencies for organic–inorganic hybrid perovskite solar cells (PSCs) have been achieved. However, their operational stability still needs to be improved. The intrinsic instability of halide perovskites caused by the presence of volatile organic cations, as well as the degradation of hybrid perovskites induced by the adverse permeation of environmental water (H2O)/oxygen (O2) and the undesired ion diffusion or migration are the major reasons. Beyond strengthening perovskites themselves, interface engineering is now regarded as a valid strategy to prolong device lifetime by preventing the undesired degradation pathways. This comprehensive review highlights the utilization of practical interface engineering for enhancing the efficiency and stability of organic–inorganic lead halide PSCs. First, the impacts of interface design on the energy‐level alignment and carrier dynamics are overviewed. Second, recent progresses on the development of interfacial materials for simultaneously achieving high efficiency and stability of PSCs are summarized. At last, the interfacial layer design principles along with future outlook of this rapidly developing field are discussed.

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“…In this respect, triphenylamine moieties have been extensively applied because of their strong electron-donating character, which may be favorable for extending the absorption spectra by enhancing the intramolecular charge-transfer (ICT) effect. , On the other hand, good planarity of the D−π–A framework is also essential for assuring excellent ICT effect and broad absorption spectra . However, dyes with good planarity tend to cause unfavorable severe dye aggregation, leading to lowered photovoltages. − To address these two contradictory effects, alkoxy/alkyl groups have been introduced into the two terminal phenyl groups of the triphenylamine moieties to effectively suppress the dye aggregation effect (Chart a). − …”

Section: Introductionmentioning

confidence: 99%

Organic Sensitizers with Extended Conjugation Frameworks as Cosensitizers of Porphyrins for Developing Efficient Dye-Sensitized Solar Cells

Cheng

Yang

Jiang

et al. 2018

ACS Appl. Mater. Interfaces

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Relatively high efficiencies have been achieved for porphyrin-based dye-sensitized solar cells. For the purpose of designing efficient cosensitizers, we herein report systematically optimized dyes XC1−XC5 employing a triphenylamine donor, a benzothiadiazole moiety as the auxiliary acceptor, and a benzoic acid acceptor. One hexyl and four hexyloxy groups were introduced, and an ethynylene moiety was introduced between the donor and the auxiliary acceptor to afford XC1. To further extend the absorption wavelength, a second ethynylene moiety was introduced between the acceptor and the auxiliary acceptor to afford XC2. XC3 and XC4 were designed by introducing one and two methyl substituents, respectively, into the meta-positions of the anchoring carboxyl group. XC5 was further synthesized by inserting a cyano substituent into one of the ortho-positions of the carboxyl group with the purpose to strengthen the intramolecular charge-transfer effect and thus broaden the absorption wavelength. As expected, compared with the J sc (14.29 mA•cm −2 ) of XC1, the corresponding J sc values for XC2−XC5 were enhanced to 16. 50, 16.95, 16.73, and 17.74 mA•cm −2 , respectively. Moreover, XC4 exhibits the highest V oc of 770 mV owing to the presence of a maximum of seven chains, which can effectively suppress dye aggregation. As a result, compared with XC1, XC2−XC5 exhibit improved efficiencies of 8.67, 9.05, 8.78, and 9.30%, respectively. In addition, the efficiencies of XC3 and XC5 were further enhanced by cosensitizing them with our previously reported porphyrin dye XW28 under various conditions. Finally, a remarkable efficiency of 10.50% was achieved for the cells cosensitized with XC5 and XW28. These results indicate that the combination of good planarity of the extended D−π−A framework with multiple alkoxy/alkyl chains may compose an effective optimizing strategy for designing and synthesizing excellent cosensitizers for porphyrins.

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Metal‐Free Sensitizers Containing Hydantoin Acceptor as High Performance Anchoring Group for Dye‐Sensitized Solar Cells

Cited by 54 publications

References 30 publications

Prediction of Absorption Spectrum Shifts in Dyes Adsorbed on Titania

Prediction of Absorption Spectrum Shifts in Dyes Adsorbed on Titania

Review on Practical Interface Engineering of Perovskite Solar Cells: From Efficiency to Stability

Organic Sensitizers with Extended Conjugation Frameworks as Cosensitizers of Porphyrins for Developing Efficient Dye-Sensitized Solar Cells

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