Crystallization Kinetics in a Glass-Forming Hybrid Metal Halide Perovskite
Crystallization Kinetics in a Glass-Forming Hybrid Metal Halide Perovskite
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DOI：
10.1021/acsmaterialslett.2c00495
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发表时间：
2022-08
影响因子：
11.4
通讯作者：
Ashutosh Kumar Singh;D. Mitzi
中科院分区：
文献类型：
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作者：
Ashutosh Kumar Singh;D. Mitzi
最近发现的玻璃形成混合金属卤化物钙钛矿（MHP）半导体为探索其实用性提供了机会，超越了已经著名的光伏和发光体领域，正如其晶体对应物所实现的那样。玻璃态和晶态之间的可逆切换现象进一步将潜在的应用空间扩展到内存、计算、光子学、超材料和相变能量存储。为了更好地确定特征转换特性，结合量热法、显微镜和动力学建模技术，研究了示例性玻璃形成 (S)-(−)-1-(1-萘基)乙基铵溴化铅 (SNPB) 钙钛矿的玻璃结晶的基本动力学。该研究表明，玻璃晶转变的活化能约为 350 kJ/mol，Avrami 参数为 n= 2.02 ± 0.11，并指出空间中二维层流生长的非均质表面介导的微晶成核。这些结果可作为对 MHP 中的玻璃结晶动力学效应进行建模的初步指南，并有助于评估玻璃形成 MHP 在广泛的预期应用中的适用性。
The recent discovery of glass-forming hybrid metal halide perovskite (MHP) semiconductors has opened the opportunity to explore their utility beyond the already celebrated fields of photovoltaics and light emitters, as enabled by their crystalline counterparts. Reversible switching phenomena between glassy and crystalline states further extends the potential application space, prospectively, to memory, computing, photonics, metamaterials, and phase change energy storage. To better identify the characteristic switching properties, the underlying kinetics of glass crystallization is studied for an exemplary glass-forming (S)-(−)-1-(1-naphthyl)ethylammonium lead bromide (SNPB) perovskite, using a combination of calorimetry, microscopy, and kinetic modeling techniques. The study shows an activation energy of ∼350 kJ/mol for the glass-crystalline transition and an Avrami parameter ofn= 2.02 ± 0.11, and points to heterogeneous surface-mediated nucleation of crystallites with two-dimensional laminar growth in space. These results serve as an initial guide toward modeling the glass-crystallization kinetic effects in MHPs and to facilitate assessment of the suitability of the glass-forming MHPs for a broad range of prospective applications.