Electrically conductive tape (ECT) was characterized and used to assemble shingled cell strings at low temperature to achieve high reliability Pb- and Ag-free interconnections. The volume resistivity for two considered ECTs are 0.13 ± 0.06 mΩ·cm and 0.47 ± 0.20 mΩ·cm and specific contact resistances, 6.85± 2.00 mΩ·cm² and 6.30 ± 0.37 mΩ·cm² using the emerging IEC 62788-8-1 Technical Specification for assessment of electrically conductive adhesives (ECA). Durability and performance of the technology in glass–glass mini modules were evaluated with temperature cycling, damp heat testing, and combined-accelerated stress testing (CAST). Through temperature cycling (−40°C to 85°C) applying five times the mini module short-circuit current in forward bias and in the multi climate CAST protocol, there was negligible degradation of fill factor after replacing connectors at the modules' cable leads; however, CAST resulted in short circuit current loss attributed to degradation in light collection by the cells, not the ECT. The IEC 61215-2 85°C, 85% relative humidity damp heat testing showed susceptibility of the HJT cells to effects of humidity in the electroluminescence intensity around the module perimeter that degraded power performance by 4% (relative). Contrasting the IEC 61215-2 qualification testing-based damp heat testing with CAST, factors such as the optical stress of CAST may precipitate the degradation of the modules whereas the humidity levels and duration of IEC 61215-2 damp heat testing may lead to excessive levels of humidity diffused into the modules, potentially resulting in degradation that is unrepresentative of the field.

中文翻译：

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用于叠瓦硅异质结技术电池的导电胶带的性能和耐用性

导电胶带 (ECT) 被表征并用于在低温下组装叠瓦式电池串，以实现高可靠性的无铅和无银互连。使用新兴的 IEC 62788-8-1，两种考虑的 ECT 的体积电阻率为 0.13 ± 0.06 mΩ·cm 和 0.47 ± 0.20 mΩ·cm，比接触电阻为 6.85± 2.00 mΩ·cm 2 和 6.30 ± 0.37 mΩ ^· cm ²导电粘合剂（ECA）评估技术规范。通过温度循环、湿热测试和组合加速应力测试 (CAST) 评估了玻璃-玻璃微型模块技术的耐用性和性能。通过在正向偏置和多气候 CAST 协议中应用五倍迷你模块短路电流的温度循环（−40°C 至 85°C），更换模块电缆引线处的连接器后，填充因子的下降可以忽略不计; 然而，CAST 导致短路电流损失的原因是电池收集光的能力下降，而不是 ECT。IEC 61215-2 85°C、85% 相对湿度湿热测试表明，异质结电池对模块周边电致发光强度的湿度影响很敏感，导致功率性能下降 4%（相对）。与基于 IEC 61215-2 资格测试的湿热测试与 CAST 相比，CAST 的光学应力等因素可能会加速模块的退化，而 IEC 61215-2 湿热测试的湿度水平和持续时间可能会导致模块性能过高湿气扩散到模块中，可能导致不具有现场代表性的退化。