Lead halide perovskites: Crystal-liquid duality, phonon glass electron crystals, and large polaron formation.
Lead halide perovskites: Crystal-liquid duality, phonon glass electron crystals, and large polaron formation.
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DOI：
10.1126/sciadv.1701469
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发表时间：
2017-10
期刊：
影响因子：
13.6
通讯作者：
Zhu XY
中科院分区：
文献类型：
--
作者：
Miyata K;Atallah TL;Zhu XY
高效的动态筛选是卤化铅钙钛矿在太阳能电池和发光器件中取得成功的关键。卤化铅钙钛矿已被证明是太阳能电池和发光器件的高性能材料。这些材料具有晶体半导体的相干带输运特征，但具有典型的液体介质响应和声子动力学特征。这种“晶体-液体”的对偶性意味着卤化铅钙钛矿属于声子玻璃电子晶体，这类材料被认为是最有效的热电材料。我们发现晶体-液体二象性和由此产生的介电响应是导致大量极化子形成和电荷载流子筛选的原因，从而导致缺陷容错性，适度的电荷载流子迁移率和辐射复合性能。大量极化子的形成，以及声子玻璃的特性，也可以解释这些材料中热载流子冷却速率的显著降低。
Efficient dynamic screening is key to the success of lead halide perovskites in solar cells and light emitting devices. Lead halide perovskites have been demonstrated as high performance materials in solar cells and light-emitting devices. These materials are characterized by coherent band transport expected from crystalline semiconductors, but dielectric responses and phonon dynamics typical of liquids. This “crystal-liquid” duality implies that lead halide perovskites belong to phonon glass electron crystals, a class of materials believed to make the most efficient thermoelectrics. We show that the crystal-liquid duality and the resulting dielectric response are responsible for large polaron formation and screening of charge carriers, leading to defect tolerance, moderate charge carrier mobility, and radiative recombination properties. Large polaron formation, along with the phonon glass character, may also explain the marked reduction in hot carrier cooling rates in these materials.
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