Polyelectrolyte Dielectrics for Flexible Low‐Voltage Organic Thin‐Film Transistors in Highly Sensitive Pressure Sensing,Advanced Functional Materials

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Polyelectrolyte Dielectrics for Flexible Low‐Voltage Organic Thin‐Film Transistors in Highly Sensitive Pressure Sensing
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2018-11-15 , DOI: 10.1002/adfm.201806092
Ziyang Liu ₁ , Zhigang Yin ₁ , Jianbin Wang ₁ , Qingdong Zheng ₁

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Organic thin‐film transistors (OTFTs) can provide an effective platform to develop flexible pressure sensors in wearable electronics due to their good signal amplification function. However, it is particularly difficult to realize OTFT‐based pressure sensors with both low‐voltage operation and high sensitivity. Here, controllable polyelectrolyte composites based on poly(ethylene glycol) (PEG) and polyacrylic acid (PAA) are developed as a type of high‐capacitance dielectrics for flexible OTFTs and ultrasensitive pressure sensors with sub‐1 V operation. Flexible OTFTs using the PAA:PEG dielectrics show good universality and greatly enhanced electrical performance under a much smaller operating voltage of −0.7 V than those with a pristine PAA dielectric. The low‐voltage OTFTs also exhibit excellent flexibility and bending stability under various bending radii and long cycles. Flexible OTFT‐based pressure sensors with low‐voltage operation and superhigh sensitivity are demonstrated by using a suspended semiconductor/dielectric/gate structure in combination with the PAA:PEG dielectric. The sensors deliver a record high sensitivity of 452.7 kPa⁻¹ under a low‐voltage of −0.7 V, and excellent operating stability over 5000 cycles. The OTFT sensors can be built into a wearable sensor array for spatial pressure mapping, which shows a bright potential in flexible electronics such as wearable devices and smart skins.

中文翻译：

用于高灵敏压力感测的柔性低压有机薄膜晶体管的聚电解质电介质

有机薄膜晶体管（OTFT）由于其良好的信号放大功能，可以提供一个有效的平台来开发可穿戴电子设备中的柔性压力传感器。但是，要实现同时具有低压操作和高灵敏度的基于OTFT的压力传感器特别困难。在这里，基于聚乙二醇（PEG）和聚丙烯酸（PAA）的可控聚电解质复合材料被开发为一种高电容电介质，用于柔性OTFT和低于1 V工作的超灵敏压力传感器。使用PAA：PEG电介质的柔性OTFT在良好的通用性下，在-0.7 V的较小工作电压下，其电性能大大提高，而与使用原始PAA电介质的柔性OTFT相比，电性能大大提高。低压OTFT在各种弯曲半径和长周期下也表现出出色的柔韧性和弯曲稳定性。通过将悬浮的半导体/电介质/栅极结构与PAA：PEG电介质结合使用，展示了具有低电压操作和超高灵敏度的基于OTFT的柔性压力传感器。传感器提供了创纪录的452.7 kPa高灵敏度在−0.7 V的低压下为^-1，并且在5000次循环中具有出色的工作稳定性。OTFT传感器可以内置在可穿戴传感器阵列中以进行空间压力映射，这在诸如可穿戴设备和智能皮肤之类的柔性电子产品中显示出巨大的潜力。

更新日期：2018-11-15

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