PERYLENE DIIMIDE DERIVATIVE LIQUID CRYSTAL AS FACE-ON ALIGNED CATHODE INTERLAYER FOR ORGANIC SOLAR CELLS

Carlos Henrique Stadtlober (DR); UFSC; H. Bock (Pq); CRPP; Juliana Eccher

Todos os Trabalhos

Trabalho

Título do Trabalho

PERYLENE DIIMIDE DERIVATIVE LIQUID CRYSTAL AS FACE-ON ALIGNED CATHODE INTERLAYER FOR ORGANIC SOLAR CELLS

Autores

Carlos Henrique Stadtlober (DR); UFSC
H. Bock (Pq); CRPP
Juliana Eccher

Modalidade

Pôster

Área temática

1) Energy conversion and storage

Data de Publicação

17/05/2024

País da Publicação

Brasil

Idioma da Publicação

Inglês

Página do Trabalho

https://www.even3.com.br/anais/workshop-do-ineo-2024/795792-perylene-diimide-derivative-liquid-crystal-as-face-on-aligned-cathode-interlayer-for-organic-solar-cells

ISBN

978-65-272-0462-6

Palavras-Chave

Organic Solar Cells, Cathode Interlayer, Liquid Crystal

Resumo

In recent years, solution-processed organic solar cells (OSCs) have seen significant progress, achieving power conversion efficiencies (PCE) exceeding 19%, primarily due to the introduction of novel materials like the Y6 acceptor. However, translating these advancements to industrial-scale manufacturing implicates several challenges. One critical aspect is optimizing the interfacial layers within the OSC structure, particularly the cathode interlayer (CIL). The CIL eliminates energy barriers, repairs interfacial contacts, and promotes electron transport between the active layer and electrodes by stimulating the real potential of photoelectric conversion. Nevertheless, a thickness-insensitive CIL could also serve as an encapsulation agent, prolonging device lifetime [1]. Organic materials for CILs typically fall into two categories: polymer-based and small-molecule-based. Examples of polymer-based interlayers include PFN-Br and its derivatives, while small-molecule CILs include perylene-diimide (PDI) based molecules. However, the batch-to-batch reproducibility issues associated with polymeric CILs hinder their scalability for industrial production. Nevertheless, polymeric CILs often exhibit partial face-on alignment, which can reduce charge transfer resistance compared to PDI CILs [2]. An alternative of small-molecule CIL that can be aligned are the thermotropic columnar liquid crystals (ColLCs), particularly those with PDI centers. These materials exhibit mesomorphic properties that change with temperature, allowing for controlled alignment. When confined between surfaces and subjected to temperatures approaching the isotropic phase, ColLC molecules gain fluidity, enabling them to self-organize in a face-on orientation. Here, we have fully aligned a ColLC based on benzo-perylene diimide center in a face-on orientation on the top of a donor:aceptor photoactive layer composed of the blend P3HT:ICBA. This achievement marks the first reported instance of fully face-on aligned CIL in organic solar cells. The aligned ColLC significantly enhances PCE efficiency compared to non-aligned devices. Face-on alignment promotes efficient charge migration towards the electrodes, reducing resistance. Additionally, the PCE of the device with the aligned CIL is higher than the PCE of the device without any CIL. The interlayer acts as an interfacial dipole, inducing a vacuum-level shift that modifies the electrode's work function and reduces energetic barriers between the active layer and metal electrode [3]. We are thankful to CAPES, CAPES-COFECUB Project, CNPq, and INCT/INEO. 1. Zi M, Chen X, Tan S, Weng C, Zhao B. Organic solar cells with efficiency of 17.6% and fill factor of 78.3% based on perylene-diimide derivative as cathode interface layer. Chem Eng J. 2022;443:136455. doi:10.1016/j.cej.2022.136455 2. Zheng H, Hu L, Hu X, et al. Designing thickness-insensitive cathode interlayers via constructing noncovalently conformational locks for highly efficient non-fullerene organic solar cells. J Mater Chem A. 2024;12(4):2413-2422. doi:10.1039/D3TA07050F 3. Zhang ZG, Qi B, Jin Z, et al. Perylene diimides: a thickness-insensitive cathode interlayer for high performance polymer solar cells. Energy Environ Sci. 2014;7(6):1966. doi:10.1039/c4ee00022f

Título do Evento: Workshop do INEO 2024
Cidade do Evento: Nazaré Paulista
Título dos Anais do Evento: Anais do Workshop INEO 2024
Nome da Editora: Even3
Meio de Divulgação: Meio Digital

Como citar

UFSC, Carlos Henrique Stadtlober (DR);; CRPP, H. Bock (Pq);; ECCHER, Juliana. PERYLENE DIIMIDE DERIVATIVE LIQUID CRYSTAL AS FACE-ON ALIGNED CATHODE INTERLAYER FOR ORGANIC SOLAR CELLS.. In: Anais do Workshop INEO 2024. Anais...Nazaré Paulista(SP) Hotel Estância Atibainha, 2024. Disponível em: https//www.even3.com.br/anais/workshop-do-ineo-2024/795792-PERYLENE-DIIMIDE-DERIVATIVE-LIQUID-CRYSTAL-AS-FACE-ON-ALIGNED-CATHODE-INTERLAYER-FOR-ORGANIC-SOLAR-CELLS. Acesso em: 16/07/2025