Highly light scattering structures have been generated in a poly(ethylene terephthalate) (PET) film using a CO2 laser. The haze, and in some cases the transparency, of the PET films have been improved by varying the processing parameters of the laser (namely, scanning velocity, laser output power, and spacing between processed tracks). When compared with the unprocessed PET, the haze has improved from an average value of 3.26% to a peak of 55.42%, which equates to an absolute improvement of 52.16% or a 17-fold increase. In addition to the optical properties, the surfaces have been characterised using optical microscopy and mapped with an optical profilometer. Key surface parameters that equate to the amount and structure of surface roughness and features have been analysed. The CO2 laser generates microstructures at high speed, without affecting the bulk properties of the material, and is inherently a chemical-free process making it particularly applicable for use in industry, fitting well with the high-throughput, roll to roll processes associated with the production of flexible organic photovoltaic devices.

中文翻译：

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使用 CO2 激光器在聚（对苯二甲酸乙二醇酯）中快速、无化学生成光学散射结构，用于轻量级和灵活的光伏应用

使用 CO2 激光在聚对苯二甲酸乙二醇酯 (PET) 薄膜中生成了高度光散射结构。通过改变激光的加工参数（即扫描速度、激光输出功率和加工轨迹之间的间距），PET 薄膜的雾度和在某些情况下的透明度得到了改善。与未加工的PET相比，雾度从平均值的3.26%提高到55.42%的峰值，这相当于绝对提高了52.16%，增加了17倍。除了光学特性外，还使用光学显微镜对表面进行了表征，并使用光学轮廓仪进行了映射。已经分析了与表面粗糙度和特征的数量和结构相等的关键表面参数。CO2 激光器高速产生微结构，