The Role of Surface Tension in the Crystallization of Metal Halide Perovskites

Zhumekenov, Ayan A.; Burlakov, V. M.; Saidaminov, Makhsud I.; Alofi, Abdulilah; Haque, Azimul; Türedi, Bekir; Davaasuren, Bambar; Dursun, İbrahim; Cho, Namchul; El‐Zohry, Ahmed M.; Bastiani, Michele De; Giugni, Andrea; Torre, Bruno; Fabrizio, E. Di; Mohammed, Omar F.; Rothenberger, Alexander; Wu, Tom; Goriely, Alain; Bakr, Osman M.

doi:10.1021/acsenergylett.7b00468

Cited by 165 publications

(167 citation statements)

References 61 publications

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“…Hence, CB leaves the precursor ions susceptible to moisture in the environment, which induces the higher degree of browning or heterogeneous crystallization as observed in the CB/precursor mixture in the precipitation experiment. This poor defense against moisture lead to the crystallite size in CB samples being larger than Tol samples, despite the higher surface tension and viscosity CB than Tol, which should otherwise facilitate higher nucleation and lower crystallite size . Supporting evidence can be observed in the crystallite size which is significantly higher for ambient‐processed CB sample than inert‐processed CB sample.…”

Section: Resultsmentioning

confidence: 94%

Controlling Homogenous Spherulitic Crystallization for High‐Efficiency Planar Perovskite Solar Cells Fabricated under Ambient High‐Humidity Conditions

Angmo

Peng

Seeber

et al. 2019

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The influence of precursor solution properties, fabrication environment, and antisolvent properties on the microstructural evolution of perovskite films is reported. First, the impact of fabrication environment on the morphology of methyl ammonium lead iodide (MAPbI3) perovskite films with various Lewis‐base additives is reported. Second, the influence of antisolvent properties on perovskite film microstructure is investigated using antisolvents ranging from nonpolar heptane to highly polar water. This study shows an ambient environment that accelerates crystal growth at the expense of nucleation and introduces anisotropies in crystal morphology. The use of antisolvents enhances nucleation but also influences ambient moisture interaction with the precursor solution, resulting in different crystal morphology (shape, size, dispersity) in different antisolvents. Crystal morphology, in turn, dictates film quality. A homogenous spherulitic crystallization results in pinhole‐free films with similar microstructure irrespective of processing environment. This study further demonstrates propyl acetate, an environmentally benign antisolvent, which can induce spherulitic crystallization under ambient environment (52% relative humidity, 25 °C). With this, planar perovskite solar cells with ≈17.78% stabilized power conversion efficiency are achieved. Finally, a simple precipitation test and in situ crystallization imaging under an optical microscope that can enable a facile a priori screening of antisolvents is shown.

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Section: Resultsmentioning

confidence: 94%

Controlling Homogenous Spherulitic Crystallization for High‐Efficiency Planar Perovskite Solar Cells Fabricated under Ambient High‐Humidity Conditions

Angmo

Peng

Seeber

et al. 2019

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“…Figure a and b illustrate the retrograde solubility curves of MAPbI 3 in GBL and MAPbBr 3 in DMF . It was found that a complex was formed initially by molecular binding of perovskites and solvent at low temperatures, which decomposed into free perovskite molecules with increasing temperature . Therefore, inverse temperature crystallization can be put into effect through heating of a perovskite‐precursor solution with the proper concentration.…”

Section: Fabrication Methods For Perovskite Single‐crystal Thin Filmsmentioning

confidence: 99%

“…Recently, Bakr et al developed a surface tension‐controlled inverse temperature crystallization method to achieve preferential growth in the lateral direction at the solution–air interface . The intermolecular distances in the surface layer are larger due to surface‐tension effects, which thus decreases the corresponding molecular interaction energies, as illustrated in Figure a.…”

Section: Fabrication Methods For Perovskite Single‐crystal Thin Filmsmentioning

confidence: 99%

Recent Advances in Halide Perovskite Single‐Crystal Thin Films: Fabrication Methods and Optoelectronic Applications

et al. 2019

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Metal‐halide perovskites have aroused intense interest in the scientific community by virtue of their numerous remarkable optoelectronic properties, which render them promising candidates for applications in various optoelectronic fields, such as solar cells, light‐emitting diodes, photodetectors, and lasers. Compared with perovskite polycrystalline films and nanocrystals, grain‐boundary‐free single‐crystal perovskites possess lower trap‐state densities, higher carrier mobilities, and longer diffusion lengths, which are supposed to deliver superior optoelectronic performance. However, the thickness (a few millimeters) of typical bulk single‐crystal perovskites are much greater than their carrier diffusion length (e.g., MAPbI3 SC, ≈175 µm), which results in severe charge accumulation and significantly hinders their development. To this end, fabricating single‐crystal thin films is of great importance for further exploring the potential of single‐crystal perovskites in various applications. In this paper, the rapid and prosperous developments in the fabrication methods of perovskite single‐crystal thin films are systematically summarized and recent encouraging progress in their physical and chemical properties as well as the optoelectronic applications (solar cells, photodetectors, and light‐emitting diodes) of single‐crystal thin films are reviewed. Finally, the challenges and a brief outlook for further improving the quality of perovskite single‐crystal thin films and optimizing the device design are highlighted.

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“…For example, photodetectors based on methylammonium lead chloride (MAPbCl 3 ) perovskite polycrystalline thin film, which is an ideal candidate material for solution‐processed visible‐blind UV photodetectors as its absorption is mainly limited to wavelengths shorter than 400 nm, still suffer from low sensitivity or response speed due to the difficulty of fabricating a uniform and dense thin film with low trap density . Using high‐quality perovskite single crystal as the active layer represents an effective way to circumvent the performance bottlenecks of polycrystalline thin films . Nevertheless, the thickness of the currently reported MAPbCl 3 single crystal is far beyond its carrier diffusion length, yielding devices with low detectivity (1.2 × 10 10 Jones) and slow response speed (24 ms) .…”

Section: Introductionmentioning

confidence: 99%

Solution‐Processed Visible‐Blind Ultraviolet Photodetectors with Nanosecond Response Time and High Detectivity

Chen

Zhumekenov

et al. 2019

Advanced Optical Materials

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Ultrafast, high‐sensitivity, visible‐blind ultraviolet (UV) photodetectors are crucial for practical applications, including: optical communication, environmental ozone hole monitoring, and combustion and chemical detection. However, commercial visible‐blind UV photodetectors based on traditional inorganic semiconductor materials involve expensive production processes, while the currently solution‐processed detectors still suffer from issues of low sensitivity or slow response speed. Herein, high‐performance visible‐blind UV photodetectors with simultaneously ultrafast response speed and high detectivity are achieved from solution‐processed micrometer‐thick methylammonium lead trichloride perovskite thin single crystals, grown in high quality with smooth surfaces by judiciously designing the substrate's wettability. The as‐fabricated UV photodetectors exhibit a low noise of 6.5 fA Hz−1/2, a low detection limit of 8.5 pW cm−2, and high specific detectivity of ≈6 × 1012 Jones. A fast response time of 15 ns and a large bandwidth of 25 MHz are obtained when decreasing the crystal thickness to 1 µm. The nanosecond response speed is several orders of magnitude faster than the best ever reported solution‐processed visible‐blind UV photodetectors and is comparable to reported UV photodetectors based on traditional (high‐temperature processed) inorganic semiconductors. The high performance combined with low‐cost fabrication makes these visible‐blind UV photodetectors highly attractive for applications in optical communication and ultrafast detection.

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The Role of Surface Tension in the Crystallization of Metal Halide Perovskites

Cited by 165 publications

References 61 publications

Controlling Homogenous Spherulitic Crystallization for High‐Efficiency Planar Perovskite Solar Cells Fabricated under Ambient High‐Humidity Conditions

Controlling Homogenous Spherulitic Crystallization for High‐Efficiency Planar Perovskite Solar Cells Fabricated under Ambient High‐Humidity Conditions

Recent Advances in Halide Perovskite Single‐Crystal Thin Films: Fabrication Methods and Optoelectronic Applications

Solution‐Processed Visible‐Blind Ultraviolet Photodetectors with Nanosecond Response Time and High Detectivity

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