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Morphology and Photoluminescence of CH3NH3PbI3 Deposits on Nonplanar, Strongly Curved Substrates
ACS Photonics ( IF 7 ) Pub Date : 2018-03-07 00:00:00 , DOI: 10.1021/acsphotonics.7b01496
Konstantins Mantulnikovs 1 , Anastasiia Glushkova 1 , Péter Matus 1 , Luka Ćirić 1 , Márton Kollár 1 , László Forró 1 , Endre Horváth 1 , Andrzej Sienkiewicz 1, 2
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Organic–inorganic metal halide perovskites have recently attracted increasing attention as highly efficient light harvesting materials for photovoltaic applications. The solution processability of these materials is one of their major advantages on the route toward fabrication of low-cost solar cells and optoelectronic devices. However, the precise control of crystallization and morphology of organometallic perovskites deposited from solutions, considered crucial for enhancing the final photovoltaic performance, still remains challenging. In this context, here, we report on growing microcrystalline deposits of methylammonium lead triiodide perovskite, CH3NH3PbI3 (MAPbI3), by one-step solution casting on cylinder-shaped quartz substrates (rods) having diameters in the range of 80 to 1800 μm. We show that the substrate curvature has a strong influence on morphology of the obtained polycrystalline deposits of MAPbI3. Specifically, a marked size reduction of MAPbI3 microcrystallites concomitant with an increased crystal packing density was observed with increasing the substrate curvatures. In contrast, although the crystallite width and length markedly decreased for substrates with higher curvatures, the photoluminescence (PL) spectral peak positions did not significantly evolve for MAPbI3 deposits on substrates with different diameters. The crystallite size reduction and a denser coverage of microcrystalline MAPbI3 deposits on cylinder-shaped substrates with higher curvatures were attributed to two major contributions, both related to the annealing step of the MAPbI3 deposits. In particular, the diameter-dependent variability of the heat capacities and the substrate curvature-enhanced solvent evaporation rate seemed to contribute the most to the crystallization process and the resulting morphology changes of MAPbI3 deposits on cylinder-shaped quartz substrates with various diameters. The longitudinal geometry of cylinder-shaped substrates provided also a facile solution for checking the PL response of the deposits of MAPbI3 exposed to the flow of various gaseous media, such as oxygen (O2), nitrogen (N2), and argon (Ar). Specifically, under excitation with λexc = 546 nm, the rapid and pronounced decreases and increases of PL signals were observed under intermittent subsequent exposures to O2 and N2, respectively. Overall, the approach reported herein inspires novel, cylinder-shaped geometries of MAPbI3 deposits, which can find applications in low-cost photo-optical devices, including gas sensors.

中文翻译:

形态和CH的光致发光3 NH 3碘化铅3个存款上非平面,强弯曲基板

作为用于光伏应用的高效光收集材料,有机-无机金属卤化物钙钛矿最近引起了越来越多的关注。这些材料的溶液可加工性是它们在制造低成本太阳能电池和光电器件的过程中的主要优势之一。然而,从溶液中沉积的有机金属钙钛矿的结晶和形态的精确控制仍然被认为对提高最终的光伏性能至关重要。在这种情况下,在这里,我们对甲铵的增长微晶存款报告碘化铅钙钛矿,CH 3 NH 3碘化铅3(MAPbI 3),通过一步法将其浇铸在直径为80至1800μm的圆柱状石英基板(棒)上。我们表明,衬底曲率对获得的MAPbI 3多晶沉积物的形态有很大的影响。具体地,随着基板曲率的增加,观察到MAPbI 3微晶的尺寸显着减小,同时晶体堆积密度增加。相反,尽管具有较高曲率的衬底的微晶宽度和长度显着减小,但对于具有不同直径的衬底上的MAPbI 3沉积物,光致发光(PL)光谱峰位置没有显着发展。微晶MAPbI的微晶尺寸减小和致密覆盖具有较高曲率的圆柱状基板上的3个沉积物归因于两个主要贡献,两者均与MAPbI 3沉积物的退火步骤有关。特别地,热容量和衬底曲率提高的溶剂蒸发速率随直径的变化似乎对结晶过程和MAPbI 3沉积物在具有各种直径的圆柱状石英衬底上形成的形态变化的贡献最大。圆柱状基材的纵向几何形状还提供了一种简便的解决方案,用于检查暴露于各种气态介质(例如氧气(O 2),氮气(N 2))流动的MAPbI 3沉积物的PL响应)和氩气(Ar)。具体地,在以λexc = 546 nm激发的情况下,在分别间歇地随后暴露于O 2和N 2的情况下,观察到PL信号的快速,明显下降和增加。总体而言,本文报道的方法激发了MAPbI 3沉积物的新颖的圆柱几何形状,可以在包括气体传感器在内的低成本光电设备中找到应用。
更新日期:2018-03-07
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