In general, it is hard to grow large single crystals with a one-dimensional chain structure due to the preferred growth direction and chain breakage. Most reported one-dimensional lead iodine chain single crystals can grow long, but they are difficult to grow thick. Here, we demonstrate for the first time the growth of 2 mm × 4 mm × 8 mm sized single crystal one dimensional organic lead iodine perovskite – DMAPbI₃ ((CH₃)₂NH₂PbI₃). Benzylamine addition to the solution may help to dissolve crystals with high defect concentrations so that the crystal can grow larger. Through the measurement on the large single crystal, we found that DMAPbI₃ is ferroelectric below 260 K, and the dielectric constant of DMAPbI₃ at various frequencies at room temperature is as high as more than 100. Blue photoluminescence centered at 2.6 eV was reported. The ferroelectricity of DMAPbI₃ may be used to design more stable and efficient organometal halide perovskite solar cells and photoelectric devices.

中文翻译：

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一维有机碘化钙钛矿型大单晶的性质和生长

通常，由于优选的生长方向和链断裂，难以生长具有一维链结构的大的单晶。大多数报道的一维铅碘链单晶可以长长，但很难长厚。这里，我们证明首次为2mm×4mm的×生长8毫米尺寸单晶一吨维有机铅钙钛矿碘- DMAPbI ₃（（CH ₃）₂ NH ₂碘化铅₃）。向溶液中添加苄胺可能有助于溶解具有高缺陷浓度的晶体，从而使晶体长大。通过对大型单晶的测量，我们发现DMAPbI ₃在260 K以下，它是铁电体，并且室温下各种频率下的DMAPbI ₃的介电常数都高达100。DMAPbI ₃的铁电可用于设计更稳定和有效的有机金属卤化物钙钛矿太阳能电池和光电器件。