State Key Laboratory for Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, P. R. China.
Nanoscale. 2017 Jun 22;9(24):8281-8287. doi: 10.1039/c7nr01894k.
Recently, organic-inorganic lead halide perovskites have gained great attention for their breakthrough in photovoltaic and optoelectronics. However, their thermal transport properties that affect the device lifetime and stability are still rarely explored. In this work, the thermal conductivity properties of single crystal CHNHPbI platelets grown by chemical vapor deposition are studied via non-contact micro-photoluminescence (PL) spectroscopy. We developed a measurement methodology and derived expressions suitable for the thermal conductivity extraction for micro-sized perovskites. The room temperature thermal conductivity of ∼0.14 ± 0.02 W m K is extracted from the dependence of the PL peak energy on the excitation laser power. On changing the film thickness from 80 to 400 nm, the thermal conductivity does not show noticeable variations, indicating the minimal substrate effects due to the advantage of the suspended configuration. The ultra-low thermal conductivity of perovskites, especially thin films, suggests their promising applications for thermal isolation, such as thermal insulation and thermo-electricity.
最近，有机-无机卤化铅钙钛矿因其在光伏和光电领域的突破而受到极大关注。然而，影响器件寿命和稳定性的热输运性能仍很少被探索。在这项工作中，通过非接触微光致发光（PL）光谱研究了化学气相沉积生长的单晶 CHNHPbI 薄片的热导率特性。我们开发了一种适用于微尺寸钙钛矿热导率提取的测量方法和表达式。从 PL 峰能量随激发激光功率的变化中提取出室温热导率约为 0.14±0.02 W m K。当薄膜厚度从 80nm 变化到 400nm 时，热导率没有明显的变化，这表明由于悬浮结构的优势，基底的影响最小。钙钛矿，尤其是薄膜的超低热导率表明它们在热隔离方面有很大的应用潜力，如隔热和热电。
