Semiconductor:Insulator Blends for Speed Enhancement in Organic Photodiodes,Advanced Electronic Materials

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Semiconductor:Insulator Blends for Speed Enhancement in Organic Photodiodes
Advanced Electronic Materials ( IF 5.3 ) Pub Date : 2017-12-29 , DOI: 10.1002/aelm.201700345
Noah Strobel _{1,

2} , Ralph Eckstein _{1,

2} , Jonathan Lehr ₁ , Uli Lemmer _{1,

3} , Gerardo Hernandez-Sosa _{1,

2}

Affiliation

Organic photodiodes (OPDs) have been studied intensively for a number of years, as they enable low‐cost fabrication of sensor systems for imaging, medical, or industrial applications. While the device performance in terms of responsivity and detectivity is continuously improving, detection speed still lags behind. One of the major limiting factors is the large transit times of the charges. In this work, an approach of blending insulating polymers into a poly(3‐hexylthiophene‐2,5‐diyl) and [6,6]‐phenyl C61 butyric acid methyl ester bulk heterojunction system, which has already shown beneficial effects on the transport properties in organic field effect transistors or organic solar cells, is followed. Starting from a basic morphological study using poly(methyl methacrylate) (PMMA) with different molecular weights, both the steady‐state and dynamic characteristics of the OPDs are examined. Transient photocurrent measurements show that the inclusion of PMMA results in an increase of the −3 dB cut‐off frequency without adversely affecting the device steady‐state performance under illumination or in the dark. This increase is attributed to a reduced transit time in the active layer when PMMA is present.

中文翻译：

半导体：绝缘体混合以提高有机光电二极管的速度

由于有机光电二极管（OPD）可以低成本制造用于成像，医学或工业应用的传感器系统，因此已经进行了多年深入研究。尽管设备在响应度和检测率方面的性能不断提高，但检测速度仍然落后。主要的限制因素之一是收费的运输时间长。在这项工作中，将绝缘聚合物掺混到聚（3-己基噻吩-2,5-二基）和[6,6]-苯基C61丁酸甲酯本体异质结体系中的方法，已经显示出对运输的有益作用遵循有机场效应晶体管或有机太阳能电池的特性。从使用不同分子量的聚甲基丙烯酸甲酯（PMMA）进行基本形态学研究开始，同时检查了OPD的稳态和动态特性。瞬态光电流测量结果表明，包含PMMA会导致−3 dB截止频率增加，而不会在光照或黑暗条件下对器件稳态性能产生不利影响。这种增加归因于当存在PMMA时，活性层中的传输时间缩短。

更新日期：2017-12-29

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