Among all tandem photovoltaic (PV) techniques, the perovskite/Si tandem is of particular interest as it capitalizes the mature silicon industry with decades of experience. Photo-current matching between two sub-cells is a prerequisite to achieve high efficiency in monolithic tandem cells. Here we report a low-temperature solution process for efficient perovskite/Si tandem solar cell. A highly-efficient perovskite/Si monolithic tandem cell is constructed by adjusting the electrical and optical properties of electron transport layer, and optimizing the bandgap and the optical density of perovskite absorber. With the optimized condition, the tandem cell with 1.69 eV bandgap of the perovskite absorber delivers a power conversion efficiency (PCE) of 22.22%. The steady state efficiency output at 1.42 V could reach over 20.6% over 200 s illumination. In addition, the stability of perovskite/Si two-terminal tandem devices is promising, which retains more than 85% of its original efficiency after 500 h stability test.

在所有的串联光伏（PV）技术中，钙钛矿/硅串联技术特别受关注，因为它利用数十年的经验来利用成熟的硅产业。两个子电池之间的光电流匹配是在整体串联电池中实现高效率的先决条件。在这里，我们报告了一种有效的钙钛矿/硅串联太阳能电池的低温解决方案。通过调节电子传输层的电学和光学性质，并优化钙钛矿吸收体的带隙和光密度，构建了一种高效钙钛矿/ Si整体串联电池。在最佳条件下，钙钛矿吸收体带隙为1.69 eV的串联电池可提供22.22％的功率转换效率（PCE）。在200 s的光照下，1.42 V的稳态效率输出可以达到20.6％以上。