Kim Minha, Jee Hongsub, Lee Jaehyeong
Department of Electrical and Computer Engineering, Sungkyunkwan University, Suwon 16419, Korea.
Nanomaterials (Basel). 2021 Oct 25;11(11):2840. doi: 10.3390/nano11112840.
In recent printed electronics technology, a photo-sintering technique using intense pulsed light (IPL) source has attracted attention, instead of conventional a thermal sintering process with long time and high temperature. The key principle of the photo-sintering process is the selective heating of a thin film with large light absorption coefficients, while a transparent substrate does not heat by the IPL source. Most research on photo-sintering has used a xenon flash lamp as a light source. However, the xenon flash lamp requires instantaneous high power and is unsuitable for large area applications. In this work, we developed a new photo-sintering system using a high-power ultraviolet light emitting diode (UV-LED) module. A LED light source has many merits such as low power consumption and potential large-scale application. The silver nanoparticles ink was inkjet-printed on a polyethylene terephthalate (PET) and photo-sintered by the UV-LED module with the wavelength of 365 and 385 nm. The electrical resistivity as low as 5.44 × 10 Ω·cm (just about three times compared to value of bulk silver) was achieved at optimized photo-sintering conditions (wavelength of 365 nm and light intensity of 300 mW/cm).
在最近的印刷电子技术中，一种使用强脉冲光（IPL）源的光烧结技术引起了关注，它取代了传统的长时间高温热烧结工艺。光烧结过程的关键原理是选择性加热具有大光吸收系数的薄膜，而透明基板不会被IPL源加热。大多数关于光烧结的研究都使用氙闪光灯作为光源。然而，氙闪光灯需要瞬时高功率，不适合大面积应用。在这项工作中，我们开发了一种使用高功率紫外发光二极管（UV-LED）模块的新型光烧结系统。LED光源具有许多优点，如低功耗和潜在的大规模应用。将银纳米颗粒墨水喷墨打印在聚对苯二甲酸乙二酯（PET）上，并通过波长为365和385 nm的UV-LED模块进行光烧结。在优化的光烧结条件（波长365 nm，光强度300 mW/cm）下，实现了低至5.44×10Ω·cm的电阻率（仅约为块状银电阻率值的三倍）。
