Department of Chemistry, Sungkyunkwan University Suwon, 16419, Korea.
Department of Information Display, Hongik University, Seoul, 04066, Korea.
J Nanosci Nanotechnol. 2020 Nov 1;20(11):6653-6658. doi: 10.1166/jnn.2020.18763.
A shingled module fabricated using electrically conductive adhesive (ECA) can increase the light-receiving area and provide greater power than a conventional module fabricated using solder-coated copper ribbons. However, several issues such as damage from laser cutting and poor contact by the conductive paste may arise. In this study, a 15.675 × 3.1 cm² c-Si cut cell was fabricated using a nanosecond green laser, and cell bonding was performed using ECA to fabricate shingled modules. If the laser process was performed with high speed and low power, there was insufficient depth for cut cell fabrication. This was because the laser only had a thermal effect on the surface. The cell was processed to a depth of approximately 46 m by the laser, and it could be seen that the laser cutting proceeded smoothly when the laser process affected more than 25% of the wafer thickness. The cut cell was bonded by ECA, and the process conditions were changed. The highest efficiency of 20.27% was obtained for a cell bonded under the conditions of a curing time of 60 s and curing temperature of 150°C. As a result, the efficiency of the bonded cell was increased by approximately 2.67% compared to the efficiency of the conventional cut cell. This was because the shadow loss due to the busbar was reduced, increasing the active area of the module by eliminating the busbar from the illuminated area.
使用导电胶 (ECA) 制造的叠层模块可以比使用镀锡铜带制造的传统模块增加受光面积并提供更大的功率。但是，可能会出现一些问题，例如激光切割造成的损坏和导电膏的不良接触。在这项研究中，使用纳秒绿光激光制造了一个 15.675×3.1cm² 的 c-Si 切割电池，并使用 ECA 进行电池键合以制造叠层模块。如果激光工艺以高速和低功率进行，则切割电池的制造深度不足。这是因为激光仅对表面产生热效应。激光将电池加工到大约 46μm 的深度，可以看出当激光工艺影响超过 25%的晶圆厚度时，激光切割进行得很顺利。使用 ECA 对切割电池进行键合，并改变工艺条件。在固化时间为 60s 和固化温度为 150°C 的条件下，键合电池的效率最高可达 20.27%。因此，与传统切割电池相比，键合电池的效率提高了约 2.67%。这是因为由于汇流条造成的阴影损失减少了，通过将汇流条从受光区域中去除，增加了模块的有效面积。
