{"title":"Triazatruxene Amine Donor-Based Visible-Light-Responsive Unsymmetrical Squaraine Dyes for Dye-Sensitized Solar Cells","authors":"Kiran Balaso Ingole, Shivdeep Suresh Deshmukh, Tushar Singh Verma, Sailaja Krishnamurty, Kothandam Krishnamoorthy* and Jayaraj Nithyanandhan*, ","doi":"10.1021/acsaem.4c0159110.1021/acsaem.4c01591","DOIUrl":null,"url":null,"abstract":"<p >Optimized charge-transfer dynamics at the dye-TiO<sub>2</sub>/electrolyte interface are required for an enhanced dye-sensitized solar cell (DSSC) device performance. Such an optimized interface enhances the charge-injection, dye-regeneration, and diminished charge-recombination processes, synergistically enhancing the device efficiency. In this study, octupolar-structured sensitizers are designed to improve the interaction between the dye and the redox electrolyte for increasing the dye-regeneration process upon photoexcitation. Accordingly, a set of unsymmetrical squaraine dyes with indoline and triazatruxene amine donor-based D–A–D dyes are designed (<b>KV1</b>–<b>KV3</b>), synthesized, and sensitized with a semiconducting metal oxide (TiO<sub>2</sub>) film. The sensitizer forms a monolayer on the TiO<sub>2</sub> surface, leading to a dye–dye interaction, which broadens the absorption spectrum. The N atom of the triazatruxene amine donor was left unsubstituted in <b>KV1</b>, whereas a hexyl chain was installed in <b>KV2</b> and <b>KV3</b> and a branched alkyl chain was installed on the core N atoms in <b>KV3</b> to control the self-assembly of dyes on the TiO<sub>2</sub> surface. Self-assembly of alkyl groups wrapped in <b>KV1</b>–<b>KV3</b> dyes on the TiO<sub>2</sub> surface aids surface passivation and broadens the absorption profile, improving the light-harvesting capabilities. The DSSC devices based on <b>KV2</b> exhibited a high power conversion efficiency of 7.85% (<i>V</i><sub>oc</sub> = 794 mV, <i>J</i><sub>sc</sub> = 14.76 mA/cm<sup>2</sup>, and FF = 67%), with an onset incident photon-to-current conversion efficiency response from 680 nm.</p>","PeriodicalId":4,"journal":{"name":"ACS Applied Energy Materials","volume":"7 18","pages":"7982–7991 7982–7991"},"PeriodicalIF":5.4000,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"ACS Applied Energy Materials","FirstCategoryId":"88","ListUrlMain":"https://pubs.acs.org/doi/10.1021/acsaem.4c01591","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
引用次数: 0
Abstract
Optimized charge-transfer dynamics at the dye-TiO2/electrolyte interface are required for an enhanced dye-sensitized solar cell (DSSC) device performance. Such an optimized interface enhances the charge-injection, dye-regeneration, and diminished charge-recombination processes, synergistically enhancing the device efficiency. In this study, octupolar-structured sensitizers are designed to improve the interaction between the dye and the redox electrolyte for increasing the dye-regeneration process upon photoexcitation. Accordingly, a set of unsymmetrical squaraine dyes with indoline and triazatruxene amine donor-based D–A–D dyes are designed (KV1–KV3), synthesized, and sensitized with a semiconducting metal oxide (TiO2) film. The sensitizer forms a monolayer on the TiO2 surface, leading to a dye–dye interaction, which broadens the absorption spectrum. The N atom of the triazatruxene amine donor was left unsubstituted in KV1, whereas a hexyl chain was installed in KV2 and KV3 and a branched alkyl chain was installed on the core N atoms in KV3 to control the self-assembly of dyes on the TiO2 surface. Self-assembly of alkyl groups wrapped in KV1–KV3 dyes on the TiO2 surface aids surface passivation and broadens the absorption profile, improving the light-harvesting capabilities. The DSSC devices based on KV2 exhibited a high power conversion efficiency of 7.85% (Voc = 794 mV, Jsc = 14.76 mA/cm2, and FF = 67%), with an onset incident photon-to-current conversion efficiency response from 680 nm.
期刊介绍:
ACS Applied Energy Materials is an interdisciplinary journal publishing original research covering all aspects of materials, engineering, chemistry, physics and biology relevant to energy conversion and storage. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important energy applications.