Solution-processed mixed halide CH3NH3PbI3−xClx thin films prepared by repeated dip coating

Nano-fiber structure of ZnO and Ni doped ZnO (Ni:ZnO) transparent thin films have been deposited on glass substrate at 350 C at an ambient atmosphere via spray pyrolysis technique. The structural, surface morphological and opto-electrical properties of ZnO and Ni doped ZnO thin films have been investigated. The XRD patterns show that the films are of polycrystalline in nature having preferential orientation (0 0 2) plane for ZnO changes to (1 0 1) by Ni doping in ZnO matrix. Optical study exhibits red shifting in band gap energy with Ni doping due to spd hybridization and display high absorption coefficient of the order of 10 7 m À1 . The photoluminescence (PL) spectra indicate blue emissions in all samples. Electrical measurement confirms the resistivity of the film decreases remarkably with Ni doping and electrical transport is mainly thermally activated. From Hall Effect study, it is confirmed that all the samples are n-type having carrier concentration of the order of 10 18 cm À3 . Both mobility and carrier concentrations of the films became higher than ZnO sample with the increase of Ni concentration.

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“…is the absorption co-efficient calculated from transmittance and reflectance data using the relation (Karim et al, 2015b(Karim et al, , 2019:…”

Section: Optical Studymentioning

confidence: 99%

Effect of Ni doping on structure, morphology and opto-transport properties of spray pyrolised ZnO nano-fiber

Ali

Khan

Karim

et al. 2020

Heliyon

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“…The PbI 2 phase is formed due to the decomposition of CH 3 NH 3 PbI 3– x Cl x in air. The details of the crystal structure and phase formation can be found in earlier studies. − …”

Section: Results and Discussionmentioning

confidence: 99%

“…The solution-processed CH 3 NH 3 PbI 3– x Cl x thin films were fabricated in ambient air on a glass substrate by three different cost-effective methods: chemical dip-coating (CDC), spray pyrolysis (spray), and repeated dipping–withdrawing (dipping). Details of the preparation of perovskite solutions and fabrication of CH 3 NH 3 PbI 3– x Cl x thin films by the CDC, spray, and dipping methods have been described in our previous works. − A schematic of thermoelectric power measurement by an integral method for CH 3 NH 3 PbI 3– x Cl x is shown in the Supporting Information (Figure S2). For measuring thermoelectric power, one end of the specimen was kept in an ice bath (273 K) and the other end was heated from 303 K to 388 K. The temperature was varied by varying the heater voltage and monitored using a chromel–alumel thermocouple connected with a digital multimeter (KTI, KT 105).…”

Section: Experimental Sectionmentioning

confidence: 99%

“…They usually show some similar characteristics, but the inclusion of Cl improves the photovoltaic and optoelectronic properties , of CH 3 NH 3 PbI 3– x Cl x . Recently, the efficiency of solar cells made from CH 3 NH 3 PbI 3– x Cl x has been improved from 3.8% (in 2009) to 25.5% and 29.1% for single-junction architecture and silicon-based tandem cells, respectively. , Nevertheless, low-cost, solution-processed CH 3 NH 3 PbI 3– x Cl x thin films showed distinctive qualities as optoelectronic materials, such as multicolor excitonic emissions, , second-harmonic generation, high absorption coefficient, , band gap tuning in the visible spectrum, electron–hole diffusion lengths exceeding 1 μm, high photoluminescence quantum yield, etc. All of these properties make CH 3 NH 3 PbI 3– x Cl x superior for the broader arena of photovoltaic, optoelectronic, and nanotechnology applications.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of the Thermoelectric Properties and Thermal Conductivity of CH₃NH₃PbI_3–xCl_x Thin Films Prepared by Chemical Routes

2021

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The thermoelectric properties and thermal conductivity of mixed-phase CH3NH3PbI3–x Cl x thin films have been reported as a function of temperature, ranging from room temperature (RT) to 388 K. Thermoelectric study confirms that CH3NH3PbI3–x Cl x is a p-type material and the charge carrier transport in CH3NH3PbI3–x Cl x is governed by polarons and the thermal scattering process. The Peltier function and power factor are found to decrease initially up to ∼325 K, after which they increase with increasing temperature. The position of (E F – E V) of all samples drops down sharply to zero level around 325 K. The avalanches of thermoelectric properties at ∼325 K indicate the existence of tetragonal–cubic phase transition in CH3NH3PbI3–x Cl x . The calculated thermal conductivity is very low, as desired for thermoelectric materials, due to strong anharmonic interactions. Both the figure of merit (ZT) and device efficiency increase with increasing temperature. However, ZT remains small with temperature. Despite the limitations on the operating temperature range due to phase complexity and small ZT, CH3NH3PbI3–x Cl x exhibits reasonable thermoelectric power and low thermal conductivity. This signifies the possibility of CH3NH3PbI3–x Cl x as a prospective thermoelectric material.

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“…have also performed CL spectroscopy on MAPbI 3-x Cl 3 films at low (80 K) temperature and room temperature. [66] Their main finding was that emission intensity from the perovskite film increased with decreasing temperature and exhibited negligible shift in the peak emission energy.…”

Section: Temperature Dependence Of CLmentioning

confidence: 99%

A Review and Perspective on Cathodoluminescence Analysis of Halide Perovskites

Guthrey

Moseley

2020

Advanced Energy Materials

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Halide perovskite solar cells have achieved a certified efficiency of 25.2%, surpassing CdTe and CIGS, which have long been regarded as the most-efficient thin-film photovoltaic materials. As this exciting class of materials continues to mature, researchers will require characterization techniques capable of exposing the interplay between structure, chemistry, and optoelectronic properties to inform processing strategies and increase both device efficiencies and long-term stability. Cathodoluminescence microscopy is an ideal technique to provide such information due to the high spatial resolution and robust optical information acquired. Here, the current body of work related to cathodoluminescence analysis of halide perovskite materials for optoelectronic applications is surveyed. This review demonstrates how cathodoluminescence can monitor degradation due to environmental stressors, phase segregation resulting from material processing, and other halide perovskite-centric material issues. A persistent concern associated with e-beam-based analysis of halide perovskites is what effect the electron beam has on the material properties being probed.Addressing this, a detailed discussion is provided on the origin of the cathodoluminescence signal and a review of studies focused on revealing changes in the properties of halide perovskites resulting from This article is protected by copyright. All rights reserved. e-beam excitation. Finally, a perspective on future opportunities to expand the role of cathodoluminescence analysis for halide perovskites is provided.

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Solution-processed mixed halide CH3NH3PbI3−xClx thin films prepared by repeated dip coating

Cited by 10 publications

References 45 publications

Effect of Ni doping on structure, morphology and opto-transport properties of spray pyrolised ZnO nano-fiber

Effect of Ni doping on structure, morphology and opto-transport properties of spray pyrolised ZnO nano-fiber

Evaluation of the Thermoelectric Properties and Thermal Conductivity of CH₃NH₃PbI_3–xCl_x Thin Films Prepared by Chemical Routes

A Review and Perspective on Cathodoluminescence Analysis of Halide Perovskites

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Solution-processed mixed halide CH3NH3PbI3−xClx thin films prepared by repeated dip coating

Cited by 10 publications

References 45 publications

Effect of Ni doping on structure, morphology and opto-transport properties of spray pyrolised ZnO nano-fiber

Effect of Ni doping on structure, morphology and opto-transport properties of spray pyrolised ZnO nano-fiber

Evaluation of the Thermoelectric Properties and Thermal Conductivity of CH3NH3PbI3–xClx Thin Films Prepared by Chemical Routes

A Review and Perspective on Cathodoluminescence Analysis of Halide Perovskites

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Evaluation of the Thermoelectric Properties and Thermal Conductivity of CH₃NH₃PbI_3–xCl_x Thin Films Prepared by Chemical Routes