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

IF 9.6 1区化学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

ACS Materials Letters Pub Date : 2024-10-08 eCollection Date: 2024-11-04 DOI:10.1021/acsmaterialslett.4c01899

Martina Rimmele, Zhuoran Qiao, Filip Aniés, Adam V Marsh, Aren Yazmaciyan, George Harrison, Shadi Fatayer, Nicola Gasparini, 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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通过卤素交换调整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 性能的提高在很大程度上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 Materials Letters MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

14.60

自引率

3.50%

发文量

261

期刊介绍： ACS Materials Letters is a journal that publishes high-quality and urgent papers at the forefront of fundamental and applied research in the field of materials science. It aims to bridge the gap between materials and other disciplines such as chemistry, engineering, and biology. The journal encourages multidisciplinary and innovative research that addresses global challenges. Papers submitted to ACS Materials Letters should clearly demonstrate the need for rapid disclosure of key results. The journal is interested in various areas including the design, synthesis, characterization, and evaluation of emerging materials, understanding the relationships between structure, property, and performance, as well as developing materials for applications in energy, environment, biomedical, electronics, and catalysis. The journal has a 2-year impact factor of 11.4 and is dedicated to publishing transformative materials research with fast processing times. The editors and staff of ACS Materials Letters actively participate in major scientific conferences and engage closely with readers and authors. The journal also maintains an active presence on social media to provide authors with greater visibility.