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针对传统丝网印刷技术制造太阳电池金属化栅极容易造成基材破损,且制造的栅极精度和高宽比很难提高的问题,采用喷墨技术直接将纳米银墨水打印到太阳电池基材上实现栅极金属化,并设计实现了太阳电池栅极喷印样机系统.样机系统通过USB模块实现高速数据通信;两组动态随机存储器(SDRAM)内存模块构成乒乓操作,实现不间断打印;喷印控制模块采用现场可编程门阵列(FPGA)产生喷头复杂时序波形和压电驱动波形.基于流体体积法建立了微液滴喷射模型,研究了微滴喷射机制及压电驱动波形幅值对微液滴尺寸、速度一致性的影响,并进行实验验证.通过优化喷印分辨率和在线固化温度进行系统测试,结果表明,多晶硅硅片固化温度80℃条件下,随着喷印层数的增加,栅极高度线性增加,喷印一层大约增高0.5μm,栅极宽度基本维持在35~40μm,打印层数60~80层时,形成三维形貌均匀的具有高“高宽比”的栅极.
In view of the traditional screen printing technology for manufacturing solar cell metal gate easily lead to substrate damage, and the manufacture of the gate accuracy and aspect ratio is difficult to raise the issue of using inkjet technology directly to nano-silver ink printed on the solar cell substrate On the gate metalization, and design and implementation of the solar cell nozzle prototype system.Machine system through the USB module to achieve high-speed data communications; two sets of dynamic random access memory (SDRAM) memory modules constitute ping-pong operation, to achieve uninterrupted printing; India control module uses a field programmable gate array (FPGA) to generate a complex timing waveforms and piezo driving waveforms.A model of droplet ejection is established based on the fluid volumetric method, and the effect of droplet ejection mechanism and piezoelectric driving waveform amplitude on micro Droplet size and speed consistency, and verified by experiments.According to the optimized printing resolution and on-line curing temperature, the results show that with the polysilicon wafer curing temperature of 80 ℃, with the number of printing layers increases , The gate height increases linearly, the printing layer increases about 0.5μm, the gate width is basically maintained at 35 ~ 40μm, the printing layer number 60 ~ 80 layers, the formation of three-dimensional morphology Uniform high “aspect ratio ” gate .