A mixed-cation lead mixed-halide perovskite absorber for tandem solar cells
A mixed-cation lead mixed-halide perovskite absorber for tandem solar cells
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DOI：
10.1126/science.aad5845
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发表时间：
2016-01-08
期刊：
影响因子：
56.9
通讯作者：
Snaith, Henry J.
中科院分区：
文献类型：
--
作者：
McMeekin, David P.;Sadoughi, Golnaz;Snaith, Henry J.
当用于叠层结构时，金属卤化物钙钛矿光伏电池有可能将商业硅光伏组件的效率从约20%提高到30%。通过改变卤化物成分，可以实现约1.75电子伏特（eV）的最佳钙钛矿电池光学带隙，但到目前为止，这类材料的光稳定性和热稳定性较差。在此我们展示了一种高度结晶且成分上光稳定的材料，[HC(NH₂)₂]₀.₈₃Cs₀.₁₇Pb(I₀.₆Br₀.₄)₃，其光学带隙约为1.74 eV，并且我们制造的钙钛矿电池在小面积上达到了1.2伏的开路电压和超过17%的功率转换效率，在0.715平方厘米的电池上达到了14.7%的效率。通过将这些钙钛矿电池与效率为19%的硅电池相结合，我们证明了实现效率>25%的四端叠层电池的可行性。
Metal halide perovskite photovoltaic cells could potentially boost the efficiency of commercial silicon photovoltaic modules from similar to 20 toward 30% when used in tandem architectures. An optimum perovskite cell optical band gap of similar to 1.75 electron volts (eV) can be achieved by varying halide composition, but to date, such materials have had poor photostability and thermal stability. Here we present a highly crystalline and compositionally photostable material, [HC(NH2)(2)](0.83)Cs0.17Pb(I0.6Br0.4)(3), with an optical band gap of similar to 1.74 eV, and we fabricated perovskite cells that reached open-circuit voltages of 1.2 volts and power conversion efficiency of over 17% on small areas and 14.7% on 0.715 cm(2) cells. By combining these perovskite cells with a 19%-efficient silicon cell, we demonstrated the feasibility of achieving >25%-efficient four-terminal tandem cells.