Energy Level Tuning in Conjugated Donor Polymers by Chalcogen Exchange for Low Dark Current Organic Photodetectors

IF 11.3 1区化学 Q1 CHEMISTRY, PHYSICAL

ACS Catalysis Pub Date : 2024-10-08 DOI:10.1021/acsmaterialslett.4c0189910.1021/acsmaterialslett.4c01899

Martina Rimmele, Zhuoran Qiao, Filip Aniés, Adam V. Marsh, Aren Yazmaciyan, George Harrison, Shadi Fatayer, Nicola Gasparini* and Martin Heeney*,

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引用次数: 0

Abstract

The performance of organic photodetectors (OPDs) using conjugated polymer donors and molecular acceptors has improved rapidly, but many polymers are difficult to upscale due to their complex structures. This study examines two low-complexity thiophene copolymers with substituted benzooxadiazole (FO6-BO-T) or benzothiadiazole (FO6-T). Substituting sulfur with oxygen in FO6-BO-T increased its ionization energy without affecting the optical gap. When blended with the nonfullerene acceptor IDSe, FO6-BO-T showed a significantly lower dark current density (2.06·10^–9 A cm^–2 at −2 V) compared to FO6-T. Grazing incidence wide-angle X-ray scattering (GIWAXS) measurements demonstrated that pristine FO6-BO-T exhibited a more ordered morphology than FO6-T. However, blending resulted in a significant disruption to the ordered domains in both cases, with a loss of orientational order, suggesting that FO6-BO-T’s improved performance is largely related to its increased ionization energy. This study demonstrates the potential of chalcogen atom engineering to enhance the performance of the OPD in scalable polymers.

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通过卤素交换调节共轭供体聚合物的能级，实现低暗电流有机光电探测器

使用共轭聚合物供体和分子受体的有机光电探测器（OPD）的性能迅速提高，但许多聚合物因结构复杂而难以升级。本研究探讨了两种低复杂度的噻吩与取代苯并噁二唑（FO6-BO-T）或苯并噻二唑（FO6-T）的共聚物。用氧取代 FO6-BO-T 中的硫可提高其电离能，但不会影响光隙。与非富勒烯受体 IDSe 混合后，FO6-BO-T 的暗电流密度（-2 V 时为 2.06-10-9 A cm-2）明显低于 FO6-T。掠入射广角 X 射线散射（GIWAXS）测量结果表明，原始 FO6-BO-T 的形态比 FO6-T 更有序。然而，在这两种情况下，混合会导致有序畴的严重破坏，并失去取向有序性，这表明 FO6-BO-T 性能的提高主要与其电离能的增加有关。这项研究证明了缩醛原子工程在可扩展聚合物中提高 OPD 性能的潜力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

ACS Catalysis CHEMISTRY, PHYSICAL-

CiteScore

20.80

自引率

6.20%

发文量

1253

审稿时长

1.5 months

期刊介绍： ACS Catalysis is an esteemed journal that publishes original research in the fields of heterogeneous catalysis, molecular catalysis, and biocatalysis. It offers broad coverage across diverse areas such as life sciences, organometallics and synthesis, photochemistry and electrochemistry, drug discovery and synthesis, materials science, environmental protection, polymer discovery and synthesis, and energy and fuels. The scope of the journal is to showcase innovative work in various aspects of catalysis. This includes new reactions and novel synthetic approaches utilizing known catalysts, the discovery or modification of new catalysts, elucidation of catalytic mechanisms through cutting-edge investigations, practical enhancements of existing processes, as well as conceptual advances in the field. Contributions to ACS Catalysis can encompass both experimental and theoretical research focused on catalytic molecules, macromolecules, and materials that exhibit catalytic turnover.