Detachable Top Electrode-Organic Photodetector for Repeated Nondestructive Evaluation of Device Performance and Surface Analysis of the Active Layer

IF 8.2 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

ACS Applied Materials & Interfaces Pub Date : 2025-01-24 DOI:10.1021/acsami.4c1557210.1021/acsami.4c15572

Kosei Sasaki, Chika Okuda, Theodorus Jonathan Wijaya, Sunghoon Lee, Kento Yamagishi, Takao Someya* and Tomoyuki Yokota*,

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Abstract

Organic photodetectors (OPDs) are key devices for monitoring vital signs, such as heart rate and blood oxygen level. For realizing the long-term measurement of biosignals, stable operation is essential. To improve the stability of OPDs, it is important to analyze each layer to understand the degradation mechanism. We developed detachable top electrode (DTE)-OPDs to enable both surface analysis of the active layer and device characterization to be performed nondestructively and repeatedly within a single device. The substrate of the top electrode is a 2 μm thick elastomer sheet reinforced with polyurethane nanofibers. The DTE-OPDs showed a D_sh* of 1.4 × 10¹² Jones by attaching the top electrodes to the bottom stack without external pressure. The DTE-OPDs showed no degradation after 1000 attaching/detaching cycles of the top electrodes. Using the DTE-OPDs, we successfully observed the relationship between dark current increase and oxidization of the active layer.

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用于器件性能重复无损评价和有源层表面分析的可拆卸顶电极有机光电探测器

有机光电探测器（OPDs）是监测心率、血氧水平等生命体征的关键设备。为了实现生物信号的长期测量，稳定的运行是必不可少的。为了提高opd的稳定性，有必要对每一层进行分析，以了解其退化机理。我们开发了可拆卸的顶部电极(DTE)- opd，使有源层的表面分析和器件表征能够在单个器件内无损地重复进行。顶部电极的衬底是2 μm厚的弹性体片，用聚氨酯纳米纤维增强。在没有外部压力的情况下，将顶部电极连接到底部电极堆上，dte - opd的Dsh*为1.4 × 1012 Jones。经过1000次顶部电极的连接/分离循环后，DTE-OPDs没有退化。利用dte - opd，我们成功地观察到暗电流增加与活性层氧化之间的关系。

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来源期刊

ACS Applied Materials & Interfaces 工程技术-材料科学：综合

CiteScore

16.00

自引率

6.30%

发文量

4978

审稿时长

1.8 months

期刊介绍： ACS Applied Materials & Interfaces is a leading interdisciplinary journal that brings together chemists, engineers, physicists, and biologists to explore the development and utilization of newly-discovered materials and interfacial processes for specific applications. Our journal has experienced remarkable growth since its establishment in 2009, both in terms of the number of articles published and the impact of the research showcased. We are proud to foster a truly global community, with the majority of published articles originating from outside the United States, reflecting the rapid growth of applied research worldwide.