In this study, the fabrication of conductive silver lines through the combination of laser induced forward transfer (LIFT) printing and laser sintering using the same picosecond laser is investigated. Continuous lines were firstly printed by LIFT of silver paste using the selected parameters, and then the effects of processing parameters on the morphology and conductivity of the printed line during picosecond laser sintering process were studied. A classical axisymmetric two-temperature model was established to further analyze the temperature distributions during the laser sintering process. Experimental results indicated that as the pulse energy and pulse number increased, the surface structures of the printed silver lines merged together due to the increasing temperature, leading to the improvement of the conductivity. However, the excess heat accumulation led to the oxidation of the silver paste and induced the reduction of the conductivity. The silver line with lowest resistivity of 1.4 × 10⁻⁷ Ω·m was obtained at pulse energy of 1.3 μJ, frequency of 0.8 MHz and scanning speed of 7 mm/s. The simulation results of the temperature evolution were accordant with the experimental results, and both of them exhibited the feasibility and effectiveness of the fabrication of conductive line using the developed method.

在这项研究中，研究了通过激光诱导正向转移（LIFT）印刷和使用同一皮秒激光进行激光烧结相结合的方法制造导电银线的方法。首先使用所选参数通过银浆的LIFT印刷连续线，然后研究了皮秒激光烧结过程中工艺参数对印刷线形态和电导率的影响。建立了经典的轴对称双温度模型，以进一步分析激光烧结过程中的温度分布。实验结果表明，随着脉冲能量和脉冲数的增加，印刷银线的表面结构由于温度升高而融合在一起，从而提高了电导率。然而，过多的热量积累导致银浆氧化，并导致电导率降低。最低电阻率为1.4×10的银线^-7 Ω·在1.3μJ，0.8兆赫的频率和7毫米扫描速度的脉冲能量，得到米/秒。温度演化的仿真结果与实验结果相吻合，两者都证明了用所开发的方法制造导线的可行性和有效性。