Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, UK.
Helmholtz-Zentrum Berlin für Materialien und Energie, Institute for Silicon Photovoltaics, Kekuléstrasse 5, 12489 Berlin, Germany.
Science. 2016 Jan 8;351(6269):151-5. doi: 10.1126/science.aad5845.
Metal halide perovskite photovoltaic cells could potentially boost the efficiency of commercial silicon photovoltaic modules from ∼20 toward 30% when used in tandem architectures. An optimum perovskite cell optical band gap of ~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)2Cs(0.17)Pb(I(0.6)Br(0.4))3, with an optical band gap of ~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.
金属卤化物钙钛矿光伏电池在串联结构中使用时，有望将商业硅光伏组件的效率从约 20%提高到 30%。通过改变卤化物组成，可以实现最佳的钙钛矿电池光学带隙约为 1.75 电子伏特（eV），但迄今为止，这些材料的光电稳定性和热稳定性较差。在这里，我们提出了一种具有高结晶度和组成稳定性的材料，HC(NH2)2Cs(0.17)Pb(I(0.6)Br(0.4))3，其光学带隙约为 1.74 eV，我们制造了钙钛矿电池，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 cm(2)电池上达到了 14.7%。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>25%高效率四端串联电池的可行性。
