Bifacial monolithic perovskite/silicon tandem solar cells exploit albedo—the diffuse reflected light from the environment—to increase their performance above that of monofacial perovskite/silicon tandems. Here we report bifacial tandems with certified power conversion efficiencies >25% under monofacial AM1.5G 1 sun illumination that reach power-generation densities as high as ~26 mW cm^–2 under outdoor testing. We investigated the perovskite bandgap required to attain optimized current matching under a variety of realistic illumination and albedo conditions. We then compared the properties of these bifacial tandems exposed to different albedos and provide energy yield calculations for two locations with different environmental conditions. Finally, we present a comparison of outdoor test fields of monofacial and bifacial perovskite/silicon tandems to demonstrate the added value of tandem bifaciality for locations with albedos of practical relevance.

双面单片钙钛矿/硅串联太阳能电池利用反照率（来自环境的漫反射光）将其性能提高到高于单面钙钛矿/硅串联的性能。在这里，我们报告了在单面 AM1.5G 1 太阳照射下，经认证的功率转换效率 >25% 的双面串联，发电密度高达 ~26 mW cm ^–2在户外测试中。我们研究了在各种现实照明和反照率条件下获得优化电流匹配所需的钙钛矿带隙。然后，我们比较了暴露于不同反照率的这些双面串联的特性，并提供了具有不同环境条件的两个位置的能量产量计算。最后，我们比较了单面和双面钙钛矿/硅串联的户外测试场，以证明串联双面对于具有实际相关反照率的位置的附加值。