26.7% Efficient 4-Terminal Perovskite-Silicon Tandem Solar Cell Composed of a High-Performance Semitransparent Perovskite Cell and a Doped Poly-Si/SiOx Passivating Contact Silicon Cell
26.7% Efficient 4-Terminal Perovskite-Silicon Tandem Solar Cell Composed of a High-Performance Semitransparent Perovskite Cell and a Doped Poly-Si/SiOx Passivating Contact Silicon Cell
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DOI：
10.1109/jphotov.2019.2963564
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发表时间：
2020-03-01
影响因子：
3
通讯作者：
Ok, Young-Woo
中科院分区：
文献类型：
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作者：
Rohatgi, Ajeet;Zhu, Kai;Ok, Young-Woo
单结钙钛矿太阳能电池（PSC）效率的快速上升、可调的带隙和低成本的溶液可加工性使PSC成为与硅底电池串联的有吸引力的候选者。然而，挑战在于制造高性能的半透明钙钛矿顶部电池与合适的硅底部电池相结合，对通过钙钛矿顶部电池过滤的长波光子具有高响应。目前，与不透明的钙钛矿电池相比，半透明的钙钛矿电池的性能要低得多，而高性能的硅底电池，如具有固有薄层和交叉背接触的异质结，可能过于昂贵，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%的钙钛矿-硅四端串联电池，其中包括一个高效的17.8%的CsFAMAPbIBr半透明，1.63 ev带隙钙钛矿顶部电池，以及一个>= 22%效率的n型硅底部电池，该电池由传统的硼扩散发射极和载流子选择性n（+）多晶硅/SiOx钝化触点组成。这是迄今为止发表的效率最高的钙钛矿/Si 4T串联，也是在4T配置中使用耐高温单侧n-隧道氧化物钝化接触Si电池的第一份报告。
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.