Raman Spectroscopy of Organic–Inorganic Halide Perovskites

Ledinský, Martin; Löper, P.; Niesen, Bjoern; Holovský, Jakub; Moon, Soo‐Jin; Yum, Jun‐Ho; Wolf, Stefaan De; Fejfar, A.; Ballif, Christophe

doi:10.1021/jz5026323

Cited by 221 publications

(270 citation statements)

References 28 publications

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“…It is worth remembering that PbI2 is one of the decomposition by-products of a PVK layer, due to the presence of air moisture [22]. A similar observation has also been noted by Ledinský and co-workers who reported the decomposition even under vacuum conditions [18]. The sample was intentionally heated through an increased laser power from 40% to 70%, which is considerably high for photosensitive materials, to see if it was possible to deduce any further structural distortions or modifications.…”

Section: Various Sometimes Contradictory Interpretations Of Theoretisupporting

confidence: 60%

“…Raman vibrational analysis exist for clean PVK thin films [18][19][20] which may be a consequence of Raman conditions employed. Our Raman spectroscopy results on the black areas of the films at ambient conditions (excitation wavelength (ex) 532nm) showed bands at 97, 112, 171 and 220 cm -1 attributed to Pb-I bonds and organic cation motions and is consistent with a prior study (Fig.…”

Section: Various Sometimes Contradictory Interpretations Of Theoretimentioning

confidence: 99%

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Growth patterns and properties of aerosol-assisted chemical vapor deposition of CH3NH3PbI3 films in a single step

Afzaal

Yates

2017

Surface and Coatings Technology

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Section: Various Sometimes Contradictory Interpretations Of Theoretisupporting

confidence: 60%

Section: Various Sometimes Contradictory Interpretations Of Theoretimentioning

confidence: 99%

Growth patterns and properties of aerosol-assisted chemical vapor deposition of CH3NH3PbI3 films in a single step

Afzaal

Yates

2017

Surface and Coatings Technology

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“…PL measurements were carried out with a red laser ( λ = 633 nm) and at low excitation power (~ 5 μW) in order to avoid the local heating and damage of the MWs by high laser intensities. The degradation by high laser intensities has been observed in polycrystalline MAPbI 3 films [28, 29], which is mainly due to the low thermal conductivity of MAPbI 3 [30]. Moreover, short acquisition time (10 s) was used to reduce the sample exposure to the laser light to avoid thermal decomposition and to minimize light soaking (defects curing effect) by trap filling from photogenerated free-charge carriers and O 2 , which could reduce the nonradiative recombination channels and increases the PL intensity [10].…”

Section: Resultsmentioning

confidence: 99%

Evolution of Photoluminescence, Raman, and Structure of CH3NH3PbI3 Perovskite Microwires Under Humidity Exposure

Segovia

Miao

et al. 2018

Nanoscale Res Lett

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Self-assembled organic-inorganic CH3NH3PbI3 perovskite microwires (MWs) upon humidity exposure along several weeks were investigated by photoluminescence (PL) spectroscopy, Raman spectroscopy, and X-ray diffraction (XRD). We show that, in addition to the common perovskite decomposition into PbI2 and the formation of a hydrated phase, humidity induced a gradual PL redshift at the initial weeks that is stabilized for longer exposure (~ 21 nm over the degradation process) and an intensity enhancement. Original perovskite Raman band and XRD reflections slightly shifted upon humidity, indicating defects formation and structure distortion of the MWs crystal lattice. By correlating the PL, Raman, and XRD results, it is believed that the redshift of the MWs PL emission was originated from the structural disorder caused by the incorporation of H2O molecules in the crystal lattice and radiative recombination through moisture-induced subgap trap states. Our study provides insights into the optical and structural response of organic-inorganic perovskite materials upon humidity exposure.Electronic supplementary materialThe online version of this article (10.1186/s11671-018-2470-0) contains supplementary material, which is available to authorized users.

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“…21,30 Raman spectroscopy has also been put forward as a nondestructive method to measure the ratios of different elements. 127 Other methods to detect beam damage exist, such as analyzing the low-loss region in EELS measurements. 120 A variety of methods are available to minimize beam damage in the techniques listed in Table 1.…”

Section: Page 10 Of 39 Acs Paragon Plus Environment Chemistry Of Matementioning

confidence: 99%

Perovskite-Inspired Photovoltaic Materials: Toward Best Practices in Materials Characterization and Calculations

et al. 2017

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ABSTRACT:Recently, there has been an explosive growth in research based on hybrid lead-halide perovskites for photovoltaics owing to rapid improvements in efficiency. The advent of these materials for solar applications has led to widespread interest in understanding the key enabling properties of these materials. This has resulted in renewed interest in related compounds and a search for materials that may replicate the defect-tolerant properties and long lifetimes of the hybrid lead-halide perovskites. Given the rapid pace of development of the field, the rises in efficiencies of these systems have outpaced the more basic understanding of these materials. Measuring or calculating the basic properties, such as crystal/electronic structure and composition, can be challenging because some of these materials have anisotropic structures, and/or are composed of both heavy metal cations and volatile, mobile, light elements. Some consequences are beam damage during characterization, composition change under vacuum, or compound effects, such as the alteration of the electronic structure through the influence of the substrate. These effects make it challenging to understand the basic properties integral to optoelectronic operation. Compounding these difficulties is the rapid pace with which the field progresses. This has created an ongoing need to continually evaluate best practices with respect to characterization and calculations, as well as to identify inconsistencies in reported values to determine if those inconsistencies are rooted in characterization methodology or materials synthesis. This article describes the difficulties in characterizing hybrid lead-halide perovskites and new materials, and how these challenges may be overcome. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 2 challenges discussed. The focus in this article is on crystallography, composition measurements, photoemission spectroscopy and calculations on perovskites and new, related absorbers. We suggest how some of the important artifacts could be avoided and how the reporting for each technique could be streamlined between groups to ensure reproducibility as the field progresses.

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Raman Spectroscopy of Organic–Inorganic Halide Perovskites

Cited by 221 publications

References 28 publications

Growth patterns and properties of aerosol-assisted chemical vapor deposition of CH3NH3PbI3 films in a single step

Growth patterns and properties of aerosol-assisted chemical vapor deposition of CH3NH3PbI3 films in a single step

Evolution of Photoluminescence, Raman, and Structure of CH3NH3PbI3 Perovskite Microwires Under Humidity Exposure

Perovskite-Inspired Photovoltaic Materials: Toward Best Practices in Materials Characterization and Calculations

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