Flexible electronics, which is of great importance as fundamental sensor and communication technologies for many internet-of-things applications, has established a huge market encroaching into the trillion-dollar market of solid state electronics. For the capability of being processed by printing or spraying, colloidal quantum dots (CQDs) play an increasingly important role in flexible electronics. Although the electrical properties of CQD thin-films are expected to be stable on flexible substrates, their electrical performance could be tuned for applications in flexible touch sensors. Here, we report CQD touch sensors employing polydimethylsiloxane (PDMS) triboelectric films. The electrical response of touching activity is enhanced by incorporating CQD field-effect transistors into the device architecture. Thanks to the use of the CQD thin film as a current amplifier, the field-effect CQD touch sensor shows a fast response to various touching materials, even being bent to a large curvature. It also shows a much higher output current density compared to a PDMS triboelectric touch sensor.

中文翻译：

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场效应增强型摩擦电胶体量子点柔性传感器

柔性电子作为许多物联网应用的基础传感器和通信技术非常重要，已经建立了一个巨大的市场，正在蚕食万亿美元的固态电子市场。对于通过印刷或喷涂进行加工的能力，胶体量子点 (CQD) 在柔性电子产品中发挥着越来越重要的作用。尽管预计 CQD 薄膜的电性能在柔性基板上是稳定的，但它们的电性能可以针对柔性触摸传感器的应用进行调整。在这里，我们报告了采用聚二甲基硅氧烷 (PDMS) 摩擦电薄膜的 CQD 触摸传感器。通过将 CQD 场效应晶体管集成到设备架构中，可以增强触摸活动的电响应。由于使用 CQD 薄膜作为电流放大器，场效应 CQD 触摸传感器对各种触摸材料显示出快速响应，甚至弯曲到大曲率。与 PDMS 摩擦电触摸传感器相比，它还显示出更高的输出电流密度。