Refractive index and extinction coefficient of CH_3NH_3PbI_3 studied by spectroscopic ellipsometry

Xie, Ziang; Liu, Shifeng; Qin, Laixiang; Pang, Shuping; Wang, Wei; Yu, Yang; Yao, Li; Chen, Zhijian; Wang, Shufeng; Du, Honglin; Minghui, Yu; Qin, G. G.

doi:10.1364/ome.5.000029

Cited by 144 publications

(89 citation statements)

References 37 publications

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“…As observed, the MAPbI 3 perovskite remains persistent with their dark deep brown color, whether heated at 60˚C or at room temperature. The experimentally determined bandgap (from tauc plot) of the stoichiometric MAPbI 3 material is found to be 1.58 eV, which is similar to the earlier reported value (~1.6eV) 2, [18][19] . However, the dihydrated perovskite shows a significant change in the absorption spectra at perovskite is measured to be ~3.82eV whereas at elevated temperature it is found to be 1.8eV.…”

Section: Acs Paragon Plus Environmentsupporting

confidence: 88%

Exploring Thermochromic Behavior of Hydrated Hybrid Perovskites in Solar Cells

Halder

Choudhury

Ghosh

et al. 2015

J. Phys. Chem. Lett.

101

129

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Highly reproducible and reversible thermochromic nature of dihydrated methylammonium lead iodide is found. A wide bandgap variation of the material (∼2 eV) is detected between room temperature and 60 °C under ambient condition as a result of phase transition caused by moisture absorption and desorption. In situ X-ray diffraction and Fourier transform infrared spectroscopy studies are performed to understand the mechanistic behavior during the phase transition. This thermochromic property is further explored as absorber material in mesostructured solar cells. Temperature-dependent reversible power conversion efficiency greater than 1% under standard test conditions is demonstrated; revealing its potential applicability in building integrated photovoltaics.

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Section: Acs Paragon Plus Environmentsupporting

confidence: 88%

Exploring Thermochromic Behavior of Hydrated Hybrid Perovskites in Solar Cells

Halder

Choudhury

Ghosh

et al. 2015

J. Phys. Chem. Lett.

101

129

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“…S13a shows the UV-Vis transmittance profile of the perovskite device components in the UV region, in addition to the calculated relative UV light intensity inside of the perovskite device by the Lambert law of absorption. Based on the transmittance and absorption coefficients of CH 3 NH 3 PbI 3 1011121314, Supplementary Fig. S13b gives the calculated UV light intensity decay.…”

Section: Discussionmentioning

confidence: 99%

“…This organic-inorganic hybrid material has a number of beneficial characteristics that render it suitable for photovoltaic applications. For example, a high absorption coefficient (~10 5 cm −1 )1011121314, long diffusion length (~1 μm)1516, direct band gap, and multiple fabrication methods15171819. Development of all solid-state perovskite solar cells containing Spiro-MeOTAD, optimization of the fabrication processes, device structures, and material substitution/addition have been investigated to obtain higher PCE101718192021.…”

mentioning

confidence: 99%

UV Degradation and Recovery of Perovskite Solar Cells

Lee

Kim

Bae

et al. 2016

Sci Rep

294

143

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Although the power conversion efficiency of perovskite solar cells has increased from 3.81% to 22.1% in just 7 years, they still suffer from stability issues, as they degrade upon exposure to moisture, UV light, heat, and bias voltage. We herein examined the degradation of perovskite solar cells in the presence of UV light alone. The cells were exposed to 365 nm UV light for over 1,000 h under inert gas at <0.5 ppm humidity without encapsulation. 1-sun illumination after UV degradation resulted in recovery of the fill factor and power conversion efficiency. Furthermore, during exposure to consecutive UV light, the diminished short circuit current density (Jsc) and EQE continuously restored. 1-sun light soaking induced recovery is considered to be caused by resolving of stacked charges and defect state neutralization. The Jsc and EQE bounce-back phenomenon is attributed to the beneficial effects of PbI2 which is generated by the decomposition of perovskite material.

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“…345 Meanwhile, other potentialities of halide perovskites have been explored. Thanks to their high absorption cross-section, 346 near unity fluorescence quantum efficiency 347,348 and exceptional charge diffusion length, 349 halide perovskites, under bulk, thin films or nanoparticles shapes are a potential game changer in diverse applications such as light-harvesting, 350 photodetection 351 or light-emitting devices. 352,353 Halide perovskites are of general formula ABX3, where X is a halogen anion, A is generally lead or tin and B is an organic ammonium or a cesium cation.…”

Section: D Perovskitesmentioning

confidence: 99%

Two-Dimensional Colloidal Nanocrystals

et al. 2016

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Abstract:In this paper, we review recent progresses on colloidal growth of 2D nanocrystals.We identify four main sources of anisotropy which lead to the formation of plate-and sheetlike colloidal nanomaterials. Defect induced anisotropy is a growth method which relies on the presence of topological defects at the nanoscale to induce 2D shapes objects. Such a method is particularly important in the growth of metallic nanoobjects. Another way to induce anisotropy is based on ligand engineering. The availability of some nanocrystal facets can be tuned by selectively covering the surface with ligands of tunable thickness. Cadmium chalcogenides nanoplatelets (NPLs) strongly rely on this method which offers atomic control in the thinner direction, down to a few monolayers. 2D objects can also be obtained by post or in situ self-assembly of nanocrystals. This growth method differs from the previous ones in the sense that the elementary objects are not molecular precursors, and is a common method for lead chalcogenide compounds. Finally, anisotropy may simply rely on the lattice anisotropy itself as it is common for rod-like nanocrystals. Colloidally grown Transition Metal DiChalcogenides (TMDC) in particular result from such process. We also present hybrid syntheses which combine several of the previously described methods and other paths, such as cation exchange, which expand the range of available materials. Finally, we discuss in which sense 2D-objects differ from 0D nanocrystals and review some of their applications in optoelectronics, including lasing and photodetection, and biology.

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Refractive index and extinction coefficient of CH_3NH_3PbI_3 studied by spectroscopic ellipsometry

Cited by 144 publications

References 37 publications

Exploring Thermochromic Behavior of Hydrated Hybrid Perovskites in Solar Cells

Exploring Thermochromic Behavior of Hydrated Hybrid Perovskites in Solar Cells

UV Degradation and Recovery of Perovskite Solar Cells

Two-Dimensional Colloidal Nanocrystals

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