Fabrication and room-temperature exciton photoluminescence stability studies of inorganic–organic hybrid (C12H25NH3)2SnI4 thin films

Dwivedi, V.K.; Prakash, G. Vijaya

doi:10.1016/j.solidstatesciences.2013.11.009

Cited by 13 publications

(13 citation statements)

References 45 publications

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“…A striking feature of the aged FASnI 3 is a new peak that appeared at 12.5° (indicated by & in Figure c). The peak does not match those of the SnI or SnO compounds . The new peak can be attributed to the (101) plane of the yellow FASnI 3 phase .…”

Section: Resultsmentioning

confidence: 86%

Organic Cation‐Dependent Degradation Mechanism of Organotin Halide Perovskites

Wang

Xie

et al. 2016

Adv Funct Materials

236

237

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The applications of organotin halide perovskites are limited because of their chemical instability under ambient conditions. Upon air exposure, Sn2+ can be rapidly oxidized to Sn4+, causing a large variation in the electronic properties. Here, the role of organic cations in degradation is investigated by comparing methylammonium tin iodide (MASnI3) and formamidinium tin iodide (FASnI3). Through chemical analyses and theoretical calculations, it is found that the organic cation strongly influences the oxidation of Sn2+ and the binding of H2O molecules to the perovskite lattice. On the one hand, Sn2+ can be easily oxidized to Sn4+ in MASnI3, and replacing MA with FA reduces the extent of Sn oxidation; on the other hand, FA forms a stronger hydrogen bond with H2O than does MA, leading to partial expansion of the perovskite network. The two processes compete in determining the material's conductivity. It is noted that the oxidation is a difficult process to prevent, while the water effect can be largely suppressed by reducing the moisture level. As a result, FASnI3‐based conductors and photovoltaic cells exhibit much better reproducibility as compared to MASnI3‐based devices. This study sheds light on the development of stable Pb‐free perovskite optoelectronic devices through new material design.

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Section: Resultsmentioning

confidence: 86%

Organic Cation‐Dependent Degradation Mechanism of Organotin Halide Perovskites

Wang

Xie

et al. 2016

Adv Funct Materials

236

237

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“…The 2D nature of these hybrid QWs has been used, for instance, to reach strong cou-arXiv:1511.00851v2 [cond-mat.mes-hall] 23 Jan 2016 pling regime at room temperature in cavities and with plasmons [2,[14][15][16][17]. Finally, one interesting property of 2D-HOPs is the possibility of chemical engineering that leads to a control and an improvement of their electronic properties [18][19][20][21][22][23]. The knowledge of the carrier dynamics is of high interest for the use of any materials in optoelectronic devices.…”

Section: Introductionmentioning

confidence: 99%

Exciton dynamics and non-linearities in two-dimensional hybrid organic perovskites

Abdel-Baki

Boitier

Diab

et al. 2016

Journal of Applied Physics

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Due to their high potentiality for photovoltaic applications or coherent light sources, a renewed interest in hybrid organic perovskites has emerged for few years. When they are arranged in two dimensions, these materials can be considered as hybrid quantum wells. One consequence of the unique structure of 2D hybrid organic perovskites is a huge exciton binding energy that can be tailored through chemical engineering. We present experimental investigations of the exciton nonlinearities by means of femtosecond pump-probe spectroscopy. The exciton dynamics is fitted with a bi-exponential decay with a free exciton life-time of ∼100 ps. Moreover, an ultrafast intraband relaxation (< 150 fs) is also reported. Finally, the transient modification of the excitonic line is analyzed through the moment analysis and described in terms of reduction of the oscillator strength and linewidth broadening. We show that excitonic non-linearities in 2D hybrid organic perovskites share some behaviours of inorganic semiconductors despite their high exciton binding energy.

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“…[1][2][3][4][5] Similarly, ordered structures of nanomaterials have drawn signicant research interest, since such materials give rise to many unique and enhanced properties in comparison to their bulk counterparts. 4,[7][8][9][10] One of the popular class of IO nano-hybrid materials are represented with the general formula AMX 3 , where A ¼ organic moiety, M ¼ metals (Pb 2+ , Sn 2+ , etc.) The combined properties of inorganic (such as high carrier mobility, low resistivity) and organic (such as accessibility to tunable properties and easy of fabrication) moieties make them promising candidate for many optoelectronics applications.…”

Section: Introductionmentioning

confidence: 99%

Formation of PbO hexagonal nanosheets and their conversion into luminescent inorganic–organic perovskite nanosheets: growth and mechanism

Shakya

Prakash

2015

RSC Adv.

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We report the formation of inorganic-organic (IO) hybrid perovskite (C 6 H 9 C 2 H 4 NH 3 ) 2 PbI 4 hexagonal nanosheets, using anisotropically grown PbO hexagonal nanosheets as a parent material. In place of the conventional chemical synthesis route, the PbO hexagonal nanosheets have been synthesized by the bottom-up electrochemical deposition technique. Conversion of PbO into the desired hybrid material has been achieved by the intercalation of organic moieties into the alternate layers of inorganic networks. These hybrid structures have shown strong room-temperature excitonic emission at 518 nm.An extensive study has been performed to observe the deposition parameters responsible for the growth of a well-defined hexagonal nanosheet. High-resolution transmission electron microscope results confirmed the growth of single crystalline hexagonal nanosheets in (110) plane orientation. Investigation of the surface morphology, further verified the formation of nanosheets with a smooth surface having an average roughness of 2 nm. The study revealed that the anisotropic growth of nanosheets is a result of different growth rates of crystal faces associated with the crystal lattice. ; Tel: +91 11 26591326 † Electronic supplementary information (ESI) available: Fig. S1: cyclic voltammogram of electrolyte solution used for deposition and X-ray diffraction pattern of as-deposited PbO lm. Table S1 shows the percentage of elemental composition of PbO nanosheets given by EDX result. Fig. S2 shows the effect of pH and concentration of precursors in the deposition bath. Fig. S3 shows the growth of hexagonal nanosheets as a result of secondary nucleation on the substrate. Fig. S4 shows the white light confocal microscopic images of PbO hexagonal nanosheets and photoluminescence images of converted inorganic-organic perovskite nanosheets. See

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Fabrication and room-temperature exciton photoluminescence stability studies of inorganic–organic hybrid (C12H25NH3)2SnI4 thin films

Cited by 13 publications

References 45 publications

Organic Cation‐Dependent Degradation Mechanism of Organotin Halide Perovskites

Organic Cation‐Dependent Degradation Mechanism of Organotin Halide Perovskites

Exciton dynamics and non-linearities in two-dimensional hybrid organic perovskites

Formation of PbO hexagonal nanosheets and their conversion into luminescent inorganic–organic perovskite nanosheets: growth and mechanism

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