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Impact of humidity on functionality of on-paper printed electronics

机译：湿度对纸上印刷电子功能的影响

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A multilayer coated paper substrate, combining barrier and printability properties was manufactured utilizing a pilotscale slide curtain coating technique. The coating structure consists of a thin mineral pigment layer coated on top of a barrier layer. The surface properties, i.e. smoothness and surface porosity, were adjusted by the choice of calendering parameters. The influence of surface properties on the fine line printability and conductivity of inkjetprinted silver lines was studied. Surface roughness played a significant role when printing narrow lines, increasing the risk of defects and discontinuities, whereas for wider lines the influence of surface roughness was less critical. A smooth, calendered surface resulted in finer line definition, i.e. less edge raggedness. Dimensional stability and its influence on substrate surface properties as well as on the functionality of conductive tracks and transistors were studied by exposure to high/low humidity cycles. The barrier layer of the multilayer coated paper reduced the dimensional changes and surface roughness increase caused by humidity and helped maintain the conductivity of the printed tracks. Functionality of a printed transistor during a short, one hour humidity cycle was maintained, but a longer exposure to humidity destroyed the nonencapsulated transistor.
机译：利用中试规模的滑动幕涂技术制造了兼具阻隔性和可印刷性的多层涂布纸基材。涂层结构由一层薄的矿物颜料层组成，该颜料层涂覆在阻挡层的顶部。通过选择压延参数来调节表面性质，即光滑度和表面孔隙率。研究了表面性质对细线可印刷性和喷墨印刷银线电导率的影响。当打印窄线时，表面粗糙度起着重要的作用，增加了出现缺陷和不连续的风险，而对于宽线来说，表面粗糙度的影响并不那么关键。光滑的，经过压延的表面可产生更精细的线条清晰度，即减少边缘的凹凸不平。通过暴露于高/低湿度循环中，研究了尺寸稳定性及其对衬底表面性能以及导电迹线和晶体管功能的影响。多层涂布纸的阻隔层减少了由湿度引起的尺寸变化和表面粗糙度的增加，并有助于保持印刷轨道的导电性。在短短的一个小时的湿度循环中，可以保持印刷晶体管的功能，但是长时间暴露在湿气中会破坏未封装的晶体管。

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