Distributed Feedback Lasers Based on MAPbBr3
Distributed Feedback Lasers Based on MAPbBr3
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DOI：
10.1002/admt.201700253
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发表时间：
2018-04-01
影响因子：
6.8
通讯作者：
Riedl, Thomas
中科院分区：
文献类型：
--
作者：
Pourdavoud, Neda;Mayer, Andre;Riedl, Thomas
混合型钙钛矿型半导体作为低成本、高性能的激光增益体前景看好。分布反馈(DFB)谐振器结构是解锁低阈值激光的关键，而低阈值是实现第一个电控钙钛矿型半导体激光器的关键。本文介绍了第一批基于甲基溴化铅(MAPbBr(3))薄膜的DFB激光器，在MAPbBr(3)有源层上刻印了一个线性光子光栅。在低至100℃的温度下，通过热纳米压印将周期为300 nm的高Q布拉格谐振器光栅直接图案化成MAPbBr(3)薄膜。压印过程的显著效果是将最初非常粗糙的多晶钙钛矿层显著地扁平为由数十微米量级的大晶体组成的层，表面粗糙度为0.6 nm。由于散射减少，光滑的表面为放大自发辐射的开始提供了显著降低的阈值。在光泵浦DFB激光器结构中，获得了3.4µJ cm(-2)的很低的激光阈值。可以预见，这些结果将影响到激光以外的钙钛矿基光电子器件的研究，例如发光二极管和太阳能电池。
Hybrid perovskite semiconductors hold great promise as low-cost, yet high performance gain media for lasers. Distributed feedback (DFB) resonator structures are a key to unlock low laser threshold levels, which are essential on the way to the first electrically operated perovskite laser diode. Here, the first DFB lasers based on methylammonium lead bromide (MAPbBr(3)) thin films, with a linear photonic grating imprinted into the MAPbBr(3) active layers is presented. High-Q Bragg resonator gratings with a periodicity of 300 nm are directly patterned by thermal nanoimprinting into thin films of MAPbBr(3) at a temperature as low as 100 degrees C. A notable effect of the imprinting process is a substantial flattening of the initially very rough polycrystalline perovskite layers to layers consisting of large crystals on the order of tens of microns with a surface roughness of 0.6 nm. The smooth surface affords a significantly lowered threshold for the onset of amplified spontaneous emission due to reduced scattering. In optically pumped DFB laser structures, very low lasing thresholds of 3.4 mu J cm(-2) are achieved. It is foreseen that these results will influence research on perovskite-based optoelectronic devices beyond lasers, e.g., light emitting diodes and solar cells.