The rapid rise in single-junction perovskite solar cell (PSC) efficiencies, tunable bandgap, and low-cost solution processability make PSCs an attractive candidate for tandems with Si bottom cells. However, the challenge is to fabricate a high-performance semitransparent perovskite top cell in combination with an appropriate silicon bottom cell with high response to long wavelength photons that are filtered through the perovskite top cell. Currently, semitransparent perovskite cells show much lower performance compared with their opaque counterparts, while high-performance silicon bottom cells, such as heterojunction with intrinsic thin layer and interdigitated back contact, may be too expensive to meet the cost and efficiency targets for commercial viability. Here, we demonstrate a 26.7% perovskite–Si four terminal (4T) tandem cell comprising a highly efficient 17.8% CsFAMAPbIBr semitransparent, 1.63-eV bandgap perovskite top cell, and a ≥22% efficiency n-type Si bottom cell fabricated with a conventional boron diffused emitter on the front and carrier selective n+ poly-Si/SiOx passivated contact on the rear. This is among the highest efficiency perovskite/Si 4T tandems published to date and represents the first report of the use of the high temperature-resistant single side n-tunnel oxide passivated contact Si cell in a 4T configuration.

中文翻译：

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由高性能半透明钙钛矿电池和掺杂多晶硅/SiOx 钝化接触硅电池组成的 26.7% 效率 4 端子钙钛矿-硅串联太阳能电池

单结钙钛矿太阳能电池 (PSC) 效率、可调带隙和低成本溶液可加工性的快速提高使 PSC 成为与 Si 底部电池串联的有吸引力的候选者。然而，挑战在于制造高性能半透明钙钛矿顶部电池，并结合适当的硅底部电池，对通过钙钛矿顶部电池过滤的长波长光子具有高响应。目前，半透明钙钛矿电池与其不透明对应物相比表现出低得多的性能，而高性能硅底部电池，例如具有本征薄层和叉指背接触的异质结，可能太昂贵而无法满足商业可行性的成本和效率目标。在这里，我们展示了一个 26。7% 钙钛矿-Si 四端 (4T) 串联电池，包括高效的 17.8% CsFAMAPbIBr 半透明、1.63 eV 带隙钙钛矿顶部电池，以及效率≥22% 的 n 型 Si 底部电池，该电池由传统的硼扩散发射极制成背面和载流子选择性 n+ 多晶硅/SiOx 钝化触点。这是迄今为止发布的最高效率的钙钛矿/Si 4T 串联电池之一，代表了在 4T 配置中使用耐高温单侧 n 隧道氧化物钝化接触硅电池的第一份报告。