Crystallization of 2D Hybrid Organic–Inorganic Perovskites Templated by Conductive Substrates,Advanced Functional Materials

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Crystallization of 2D Hybrid Organic–Inorganic Perovskites Templated by Conductive Substrates
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2021-01-20 , DOI: 10.1002/adfm.202009007
Petr Kovaricek ₁ , Peter Nadazdy ₂ , Eva Pluharova ₁ , Alica Brunova ₂ , Riyas Subair ₂ , Karol Vegso ₂ , Valentino Libero Pio Guerra ₁ , Oleksandr Volochanskyi ₁ , Martin Kalbac ₁ , Alexander Krasnansky ₃ , Pallavi Pandit ₄ , Stephan Volker Roth ₄ , Alexander Hinderhofer ₅ , Eva Majkova _{2,

6} , Matej Jergel _{2,

6} , Jianjun Tian ₇ , Frank Schreiber ₅ , Peter Siffalovic _{2,

6}

Affiliation

2D hybrid organic–inorganic perovskites are valued in optoelectronic applications for their tunable bandgap and excellent moisture and irradiation stability. These properties stem from both the chemical composition and crystallinity of the layer formed. Defects in the lattice, impurities, and crystal grain boundaries generally introduce trap states and surface energy pinning, limiting the ultimate performance of the perovskite; hence, an in‐depth understanding of the crystallization process is indispensable. Here, a kinetic and thermodynamic study of 2D perovskite layer crystallization on transparent conductive substrates are provided—fluorine‐doped tin oxide and graphene. Due to markedly different surface structure and chemistry, the two substrates interact differently with the perovskite layer. A time‐resolved grazing‐incidence wide‐angle X‐ray scattering (GIWAXS) is used to monitor the crystallization on the two substrates. Molecular dynamics simulations are employed to explain the experimental data and to rationalize the perovskite layer formation. The findings assist substrate selection based on the required film morphology, revealing the structural dynamics during the crystallization process, thus helping to tackle the technological challenges of structure formation of 2D perovskites for optoelectronic devices.

中文翻译：

导电基质为模板的二维杂化有机-无机钙钛矿的结晶

2D杂化有机-无机钙钛矿混合体因其可调节的带隙以及出色的水分和辐射稳定性而在光电应用中受到重视。这些性质源于所形成层的化学组成和结晶度。晶格，杂质和晶粒边界的缺陷通常会引入陷阱态和表面能束缚，从而限制了钙钛矿的最终性能。因此，对结晶过程的深入了解是必不可少的。在此，提供了在透明导电基板上二维掺杂钙钛矿层结晶的动力学和热力学研究-氟掺杂的氧化锡和石墨烯。由于明显不同的表面结构和化学性质，两种基材与钙钛矿层的相互作用不同。时间分辨掠入射广角X射线散射（GIWAXS）用于监视两个基板上的结晶。分子动力学模拟用于解释实验数据并合理化钙钛矿层的形成。这些发现有助于根据所需的膜形态来选择衬底，从而揭示了结晶过程中的结构动力学，从而有助于解决光电器件二维钙钛矿结构形成的技术难题。

更新日期：2021-03-24

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