SYNTHESIS AND EVALUATION OF NOVEL FLUORENE-BASED DYES FOR DSSC

Caio de Oliveira Argolo; Aline Magalhães dos Santos; Everton Verdan de Oliveira Cezar; Jones Limberger

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Trabalho

Título do Trabalho

SYNTHESIS AND EVALUATION OF NOVEL FLUORENE-BASED DYES FOR DSSC

Autores

Caio de Oliveira Argolo
Aline Magalhães dos Santos
Everton Verdan de Oliveira Cezar
Jones Limberger

Modalidade

Pôster - resumo

Área temática

Dispositivos optoeletrônicos

Data de Publicação

27/05/2026

País da Publicação

Brasil

Idioma da Publicação

pt-BR

Página do Trabalho

https://www.even3.com.br/anais/workshop-do-ineo-2026/1460195-synthesis-and-evaluation-of-novel-fluorene-based-dyes-for-dssc

ISBN

978-65-272-2467-9

Palavras-Chave

DSSC; Fluorene; Synthesis; Photosensitizer

Resumo

DSSCs (Dye-Sensitized Solar Cells) are devices capable of converting solar energy into electricity through semiconductor nanoparticles sensitized by dyes. In order to propose more sustainable and less expensive dye options, there is a growing interest in the development of efficient metal-free photosensitizers, produced through simpler syntheses [1]. The development of purely organic dyes aims at constructing a structure in which an electron-donating group is linked to a conjugated bridge, which is connected to an electron-accepting group capable of anchoring to the semiconductor (usually TiO2) [2]. This work was based on the synthesis and characterization of novel dyes using fluorene as the main conjugated bridge in order to obtain suitable photosensitizers for DSSCs. Four fluorene derivatives were synthesized using different donor (D) and acceptor (A) groups in two molecular architectures: D-A-D for compound 2TPA-CA and A-D-A for compounds TPA-2CA, TPA-2CYA, and DPA-Th-2CYA. The synthesis of these products uses 2,7-dibromofluorene as the main starting material, which was submitted to the following reactions: Knoevenagel condensation using different aldehydes, and then Suzuki cross-coupling using different boronic acids. Specifically for the compounds TPA-2CYA and DPA-Th-2CYA, a final step was carried out after the cross-coupling, consisting of another Knoevenagel condensation using cyanoacetic acid. Photophysical studies of absorption and emission in solution were performed, as well as solid-state reflectance via DRUV-Vis. The compounds showed high molar absorptivity values in solution (e ~ 104 L mol?¹ cm?¹). Furthermore, all compounds were applied in the sensitization of DSSCs in order to evaluate their photoconversion efficiencies (?) and compare them with the ruthenium complex N719, one of the best commercial dyes. Furthermore, the solar cells were also submitted to IPCE tests. Finally, the synthesized compounds showed ? values ranging from 0.41% to 2.23%, while N719 achieved ? = 4.78%. Overall, compounds from the A-D-A architecture exhibited better efficiencies, specially DPA-Th-2CYA, reaching the highest efficiency of 2.23%. These results highlight the great potential of fluorene as a versatile “building block” for the development of new photosensitizers, especially in the A-D-A architecture, which is currently underexplored in the literature. This work was partially financed by Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) – Código de financiamento 001. The authors acknowledge FAPERJ (SEI-260003/001526/2022 and SEI-260003/003400/2022) and INEO (FAPESP - processo nº 2025/27044-5 e CNPq - processo: 408449/2024-1). Oliveira Argolo acknowledges CNPq for the scholarship. References: 1) Yen, Y. S.; Chou, H. H.; Chen, Y. C.; Hsu, C. Y.; Lin, J. T.; J. Mater. Chem. 2012, 22, 8734. 2) Kakiage, K.; Aoyama, Y.; Yano, T.; Oya, K.; Fujisawa, J. I.; Hanaya, M.; Chem. Commun. 2015, 51, 15894.

Título do Evento: Workshop do INEO 2026
Cidade do Evento: Nazaré Paulista
Título dos Anais do Evento: Anais do Workshop do INEO 2026
Nome da Editora: Even3
Meio de Divulgação: Meio Digital

Como citar

ARGOLO, Caio de Oliveira et al.. SYNTHESIS AND EVALUATION OF NOVEL FLUORENE-BASED DYES FOR DSSC.. In: Anais do Workshop do INEO 2026. Anais...Nazaré Paulista(SP) Hotel Estância Atibainha, 2026. Disponível em: https//www.even3.com.br/anais/workshop-do-ineo-2026/1460195-SYNTHESIS-AND-EVALUATION-OF-NOVEL-FLUORENE-BASED-DYES-FOR-DSSC. Acesso em: 10/08/2026