TRANSIENT INSIGHTS INTO ORGANIC SOLAR CELLS: FROM FULLERENE TO Y-FAMILY ACCEPTORS

Gabriel De Melo Borges; A. E. X. Gavim (PD); IFSC-USP; Paulo Miranda

Todos os Trabalhos

Trabalho

Título do Trabalho

TRANSIENT INSIGHTS INTO ORGANIC SOLAR CELLS: FROM FULLERENE TO Y-FAMILY ACCEPTORS

Autores

Gabriel De Melo Borges
A. E. X. Gavim (PD); IFSC-USP
Paulo Miranda

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-2026/1462685-transient-insights-into-organic-solar-cells--from-fullerene-to-y-family-acceptors

ISBN

978-65-272-2467-9

Palavras-Chave

Organic Solar Cells, Transient Absorption Spectroscopy, Non-fullerene Acceptors

Resumo

Organic photovoltaics (OPV) are a pivotal technology for transition towards renewable energy. The remarkable progress in power conversion efficiency (PCE) in the last decades is mainly attributed to the evolution from fullerene-based molecular acceptors (PCE ~ 3-4%) to non-fullerene systems (PCE over 20%) [1,2]. In a typical bulk heterojunction (BHJ) architecture, the active layer is composed of an electron donor and acceptor (macro)molecular blend. The efficiency of the BHJ organic solar cell (OSC) is governed by a delicate balance between exciton dissociation into free charges at donor/acceptor interfaces and charge carrier extraction at electrodes, while charge recombination within the active layer diminishes the power output. In this research, we have acquired Transient Photocurrent (TPC)/ Transient Photovoltage (TPV) simultaneously to Transient Absorption (TA) measurements. TPC offers insights on charge extraction dynamics, while TPV is supposed to probe the charge recombination dynamics. This approach provides a direct correlation between optical measurements of carrier population within the active layer and electronic signals due to charge transport and recombination. We have investigated a wide range of active layers: initial fullerene-based blends as P3HT:PC61BM and PTB7-Th:PC71BM, small molecule acceptors (PBDB-T:IDIC), and the high efficiency state-of-art non fullerene blend PM6:Y6. In the comparative analysis in the short-circuit regime, charge extraction lifetime shortens as materials evolve to higher mobilities. While TA and TPC dynamics align in some systems, a contrast is apparent in high-efficiency materials, when the primary extraction occurs on timescales faster than 1 µs. The difference indicates that the RC time constant of the optical apparatus is limiting the analysis. Furthermore, fullerene materials exhibit TA decay constants shorter than the TPV counterparts, a signature of high recombination rates that limit the fill factor and device performance. The outline of this work demonstrates that simultaneous TA and TPC/TPV is a robust methodology to probe charge dynamics in OSCs, and shows that suppressing recombination remains one of the primary frontiers for the next generation of OPV materials engineering. References: CHEN, C. et al. Molecular interaction induced dual fibrils towards organic solar cells with certified efficiency over 20%. Nature Communications, [s. l.], v. 15, n. 1, art. 1381, 2024. [2] CHEN, H. et al. Organic solar cells with 20.82% efficiency and high tolerance of active layer thickness through crystallization sequence manipulation. Nature Materials, [s. l.], v. 24, n. 3, p. 444-453, 2025. Acknowledgements: CNPQ (133996/2025-5 and 311763/2025-1), INEO (FAPESP-2025/27044-5 and CNPq - 408449/2024-1).

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

BORGES, Gabriel De Melo; IFSC-USP, A. E. X. Gavim (PD);; MIRANDA, Paulo. TRANSIENT INSIGHTS INTO ORGANIC SOLAR CELLS: FROM FULLERENE TO Y-FAMILY ACCEPTORS.. 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-2026/1462685-TRANSIENT-INSIGHTS-INTO-ORGANIC-SOLAR-CELLS--FROM-FULLERENE-TO-Y-FAMILY-ACCEPTORS. Acesso em: 10/08/2026