Recently, the methylammonium lead triiodide perovskite (MAPbI₃) has shown great development potential in the solar cell field, and its efficiency as a perovskite solar cell (PCE) has reached 25.2%. However, poor stability is still a problem that restricts its wide application. Compared with the polycrystalline film material of MAPbI₃ perovskite, the single crystal MAPbI₃ material is much more stable. In addition, it possesses the advantages of ultra-low thermal conductivity and easily regulated electrical conductivity, so this kind of single crystal material has also a broad application prospect in thermoelectric fields. In this letter, we show that the chlorine (Cl) ion-doped MAPbI₃ perovskite single crystal was an effective method, which greatly improved the carrier concentration and electrical conductivity of the MAPbI₃ single crystal. When the dopant proportion of I:Cl was 100:1, we obtained the highest power factor (PF) of 2.526 µW/m K² at 30 °C for MAPbI₃ single crystal. These results provide an experimental basis for the transformation and application of this kind of perovskite single crystal materials in high efficiency thermoelectric fields.

中文翻译：

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Cl掺杂的MAPbI3钙钛矿单晶诱导高热电效应

最近，甲基铵三碘化铅钙钛矿（MAPbI ₃）在太阳能电池领域显示出巨大的发展潜力，其作为钙钛矿太阳能电池（PCE）的效率已达到25.2%。然而，稳定性差仍然是制约其广泛应用的一个问题。与MAPbI ₃钙钛矿的多晶薄膜材料相比，单晶MAPbI ₃材料要稳定得多。此外，它具有超低热导率和易于调节电导率的优点，因此这种单晶材料在热电领域也具有广阔的应用前景。在这封信中，我们展示了氯 (Cl) 离子掺杂的 MAPbI ₃钙钛矿单晶是一种有效的方法，大大提高了MAPbI ₃单晶的载流子浓度和电导率。当 I:Cl 的掺杂比例为 100:1 时，我们在 30°C 下获得了 MAPbI ₃单晶的最高功率因数 (PF)，为 2.526 µW/m K ²。这些结果为此类钙钛矿单晶材料在高效热电场中的转化和应用提供了实验依据。