Ultra-smooth perovskite thin films for lasers (Conference Presentation)
Ultra-smooth perovskite thin films for lasers (Conference Presentation)
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用于激光器的超光滑钙钛矿薄膜（会议演示）
DOI：
10.1117/12.2319364
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
T. Riedl
中科院分区：
文献类型：
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作者：
N. Pourdavoud;A. Mayer;T. Haeger;R. Heiderhoff;I. Shutsko;H.-C. Scheer;P. Görrn;T. Riedl
卤化物钙钛矿材料目前在光电子学领域具有广泛的应用前景。虽然典型的湿化学制备技术可以提供相对粗糙的多晶层，但我们最近已经证明，热压印是一种强大的沉积后处理工具，可以提供极光滑的钙钛矿薄膜，其晶体横向延伸超过数十微米。[1，2]通过对光学、形态和热学性质(如热导率)的比较研究，我们发现压制的MAPbX3薄膜与其单晶类似物具有惊人的相似性。[3]最近，我们成功地将热印迹用于全无机卤化物钙钛矿材料，如CsPbBr3。虽然沉积的CsPbBr3薄膜通常不连续且粗糙，带有大量针孔，但在相对较低的温度和压力(150℃，100bar)下的热压印将使它们变成致密、光滑、无针孔的薄膜，从而显示出显著提高的发光量子产率，与原始的CsPbBr3层相比，甚至可以实现室温放大的自发辐射(ASE)。具有光子谐振结构的热纳米压印钙钛矿结构的钙钛矿型薄膜将被证明是混合的和全无机的分布式反馈激光器，具有超低的激光阈值。J·瓦克。SCI。&Techol.B 2017，35，06G803。[2]N.Pourdavoud等人。马特上将。泰克诺。2018年，3,1700253。[3]R.Heiderhoff等人。J.Phys.化学。C 2017年，121,28306。[4]N.Pourdavoud等人。马特上将。2017年，29,1605003。
Halide perovskites are currently of interest for a variety of optoelectronic applications. While, typical wet-chemical preparation techniques afford relatively rough polycrystalline layers, we have recently demonstrated that thermal imprint is a powerful post-deposition processing tool that affords extremely smooth perovskite thin-films with crystals that extend over tens of microns laterally.[1,2] A comparative study of optical, morphological and thermal properties (e.g. thermal conductivity) reveals some striking similarity of pressed MAPbX3 thin-films and their single crystalline analogues.[3] More recently, we successfully used thermal imprint also for entirely inorganic halide perovskite materials, such as CsPbBr3. While as-deposited CsPbBr3 layers are typically discontinuous and rough with a large number of pinholes, thermal imprint at relatively low temperature and pressure (150°C, 100 bar) will be shown to turn them into dense, smooth and pinhole-free thin films, which show substantially enhanced luminescence quantum yield and in contrast to pristine CsPbBr3 layers even enable room-temperature amplified spontaneous emission (ASE). Perovskite thin films patterned by thermal nanoimprint with photonic resonator structures will be shown to afford hybrid and entirely inorganic distributed feedback lasers, with ultra-low lasing thresholds.[2,4] [1] A. Mayer et al. J. Vac. Sci. & Techol. B 2017, 35, 06G803. [2] N. Pourdavoud et al. Adv. Mater. Technol. 2018, 3, 1700253. [3] R. Heiderhoff et al. J. Phys. Chem. C 2017, 121, 28306. [4] N. Pourdavoud et al. Adv. Mater. 2017, 29, 1605003.