# Influence of the Selenophene Auxiliary Acceptor in Porphyrin Sensitizers for High-Performance Dye-Sensitized Solar Cells https://mdr.nims.go.jp/datasets/85a4628c-8e9f-4652-81a4-127c47831c4e ## Files - [Influence of the Selenophene Auxiliary by Giribabu 2024.docx](https://mdr.nims.go.jp/filesets/dea2760f-1251-47e8-8336-244780b978d2/download) ([Detail](https://mdr.nims.go.jp/filesets/dea2760f-1251-47e8-8336-244780b978d2.md)) ## Id 85a4628c-8e9f-4652-81a4-127c47831c4e ## Local identifier ## Visibility open_to_public ## State published ## Created at 2025-01-09T09:54:54.766770Z ## Updated at 2025-04-02T23:30:25.549519Z ## Published at 2025-04-03T05:10:54.249315Z ## Doi https://doi.org/10.48505/nims.5263 ## First published url https://doi.org/10.1021/acsaem.4c00062 ## Date published 2024-04-22 ## Recorded date published 2024-4-22 ## Resource type journal_article ## Manuscript type accepted_manuscript ## Collection ## Title - title: Influence of the Selenophene Auxiliary Acceptor in Porphyrin Sensitizers for High-Performance Dye-Sensitized Solar Cells title_type: original lang: en ## Description - description: Porphyrin-based dyes are widely used as sensitizers for dye-sensitized solar cells (DSSCs), but their power conversion efficiencies (PCEs) are limited mainly due to charge recombination and aggregation tendency. Here, we report two D−π−A porphyrin-based sensitizers, LG 28 and LG 29, which comprise a 3-ethynylphenothiazine as an electron donor, meso-substituted porphyrin as a π-spacer, and selenophene and cyanoacrylic acid as an auxiliary acceptor and anchoring group, respectively. When compared to the LG5 dye, we have replaced the thiophene (LG5) unit with 2-phenylselenophene (LG 28) and 2-(selenophenye-2yl)thiophene (LG 29) auxiliary acceptors. Upon successful substitution with the selenophene unit, the molar extinction coefficient was increased without noticeable change in absorption maxima. Density functional theory studies suggest that the intramolecular interactions between donor phenothiazine and acceptor anchoring groups in both sensitizers play a pivotal role. Excited state properties are found to be quenched for the sensitizers upon the formation of self-assembled monolayers on nanocrystalline TiO2. Finally, we have evaluated the device performances of both sensitizers in DSSCs using I−/I3 − liquid redox electrolyte and device efficiency of 8.83 and 10.31% using LG 28 and LG 29-based sensitizers, respectively. To understand the observed photovoltaic trends, we have performed ultrafast transient absorption studies on bare LG 28 and LG 29 sensitizers in the presence of TiO2 in solution phase, respectively. The described results confirm multilevel electron injection from different higher excited singlet states of the LG 28 sensitizer to the TiO2 conduction band with an overall rate of electron injection of 3.84 × 1011 s−1, contrary to electron injection from the lowest excited state of the LG 29 sensitizer to the TiO2 conduction band with a two-order slower rate of electron injection with a higher device efficiency than that of LG 28, and it is attributed to onset incident-photon-to-currents efficiency, which extends to 900 nm in LG 29 dye. description_type: abstract lang: en ## Creator - name: Palivela Siva Gangadhar role: author - name: Silve Dasgupta role: author - name: Prakriti R. Bangal role: author - name: Towhid H. Chowdhury role: author - name: Ashraful Islam role: author orcid: https://orcid.org/0000-0002-1633-1432 organization: National Institute for Materials Science ror: https://ror.org/026v1ze26 - name: Lingamallu Giribabu role: author ## Contact agent ## Publisher organization: American Chemical Society (ACS) ## Managing organization ## Keyword - subject: Porphyrin sensitizers schema: not_defined - subject: dye-sensitized solar cells schema: not_defined - subject: donor-π-acceptor schema: not_defined - subject: long-lived charge separated state schema: not_defined ## Rights - description: This document is the Accepted Manuscript version of a Published Work that appeared in final form in Influence of the Selenophene Auxiliary Acceptor in Porphyrin Sensitizers for High-Performance Dye-Sensitized Solar Cells, copyright © 2024 American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acsaem.4c00062 identifier: http://rightsstatements.org/vocab/InC/1.0/ ## Other identifier(s) ## Data origin - data_origin_type: other ## Embargo start_date: 2024-04-03 end_date: 2025-04-03 ## Journal - title: ACS Applied Energy Materials issn: '25740962' volume: '7' issue: '8' start_page: 3309 end_page: 3320 ## Conference ## Related item ## Funding - identifier: MLP-0092 funder_name: Council of Scientific and Industrial Research, India - funder_name: University Grants Commission - identifier: 18H02079 funder_name: Japan Society for the Promotion of Science ## Instrument ## Instrument operator ## Instrument managing organization ## Measurement method ## Specimen ## Chemical composition ## Structure for specimen ## Structural feature for specimen ## Specific property for specimen ## Process for specimen treatment ## Computational method ## Energy level/transition state ## Software ## Custom property ## Fileset - id: dea2760f-1251-47e8-8336-244780b978d2 filename: Influence of the Selenophene Auxiliary by Giribabu 2024.docx content_type: application/vnd.openxmlformats-officedocument.wordprocessingml.document size: 2155584 md5: 3ba09e55ce97f70f4d3f6487d8751ebe ## Thumbnail fileset_id: dea2760f-1251-47e8-8336-244780b978d2 filename: Influence of the Selenophene Auxiliary by Giribabu 2024.docx