Characterization of semiconducting properties of naturally occurring polycrystalline FeS2 (pyrite)

Lalvani, Shashi B.; Weston, Alan; Masden, J. T.

doi:10.1007/bf00544193

Cited by 7 publications

(7 citation statements)

References 11 publications

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“…As we can see, the first excitonic absorption peak at 895 nm (1.38 eV) corresponds to the direct bandgap of FeS 2 . 19,20 The spectral curves vary with the reaction temperature showing a faster growth at about 180−240 °C, which gives rise to an upshift of the absorption spectra as the temperature is increased. Under the same reaction temperature of 180 °C, the photoabsorption can be enhanced by increasing the aging time.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Optoelectronic Properties of Two-Dimensional FeS₂ Nanoplates

Kirkeminde

Ruzicka

Wang

et al. 2012

ACS Appl. Mater. Interfaces

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There is a growing interest in the earth abundant and nontoxic iron disulfide (FeS(2)) photovoltaic materials. Here, we report the synthesis of FeS(2) nanoplates with different spectral features which we have associated with thicknesses and crystallization. The structure and crystalline order of ultrathin FeS(2) nanoplates have a strong influence on the carrier lifetime, electronic and optical properties. We demonstrate that two-dimensional FeS(2) nanoplates show great promise for fabrication of hybrid bulk heterojunction solar cells. This opens up a host of applications of these materials as inexpensive solar cells and photocatalysts.

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Section: Resultsmentioning

confidence: 99%

Synthesis and Optoelectronic Properties of Two-Dimensional FeS₂ Nanoplates

Kirkeminde

Ruzicka

Wang

et al. 2012

ACS Appl. Mater. Interfaces

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“…The band gap of pyrite, an important parameter for solar cell applications, is still under debate 19,20 because it has been difficult to obtain highpurity crystalline pyrite materials. 2 Due to the excellent uniformity and crystallinity of the pyrite NCs we have, the indirect and direct optical band gaps of FeS 2 NCs were clearly determined by the absorption spectra 21,22 to be 0.93 and 1.38 eV, respectively. It should be noted that light absorption below the band gap can be induced by light scattering during the measurement.…”

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confidence: 97%

Air Stable, Photosensitive, Phase Pure Iron Pyrite Nanocrystal Thin Films for Photovoltaic Application

et al. 2011

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Iron pyrite (FeS(2)) is a naturally abundant and nontoxic photovoltaic material that can potentially make devices as efficient as silicon-based ones; however existing iron pyrite photovoltaic devices contain thermodynamically unstable FeS(2) film surfaces that lead to low open circuit voltages. We report the rational synthesis of phase pure, highly crystalline cubic FeS(2) nanocrystals (NCs) using a trioctylphosphine oxide (TOPO) assisted hot-injection method. The synthesized pyrite NC films have excellent air stability over one year. In contrast, obvious surface decomposition was observed on the surface of FeS(2) NCs synthesized without TOPO. A high carrier mobility of 80 cm(2)/(V s) and a strong photoconductivity were observed for the first time for pyrite films at room temperature. Our results indicate that TOPO passivates both iron and sulfur atoms on FeS(2) NC surfaces, efficiently inhibiting surface decomposition.

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“…The low electrical conductivity of FeS 2 cathodes also limits their applicability. 12,13 The discharge reaction of FeS 2 as a cathode material in thermal batteries is as given below: FeS 2 + 3 2 Li + + 3 2 e − → 1 2 Li 3 Fe 2 S 4 ("z-phase") [2] However, the high impedance of Li 3 Fe 2 S 4 (the "z-phase"), which is produced in the previous discharge stage, adversely affects its electrochemical properties. 14 In order to reduce the impedances of the electrodes of thermal batteries, new fabrication methods (such as plasma spraying) have been employed to produce FeS 2 cathodes.…”

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confidence: 99%

CoS₂Coatings for Improving Thermal Stability and Electrochemical Performance of FeS₂Cathodes for Thermal Batteries

Ning

Liu

Xie

et al. 2018

J. Electrochem. Soc.

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The cathode material pyrite (FeS 2 ) (core) was coated with 2.5, 5.0, 7.5, and 10.0 wt% CoS 2 (shell) (denoted as FeS 2 @CoS 2 ) by the hydrothermal method and a subsequent heat-treatment to form composites with enhanced thermal stability and electrochemical performance. Importantly, results indicate indicated that CoS 2 particles with a complete crystal structure had been successfully coated on the FeS 2 surface. The sample coated with the optimal amount of CoS 2 , which was determined to be 7.5 wt%, showed the highest thermal decomposition temperature (610.6 • C) and excellent specific capacity (as high as 320 mA h g −1 at 520 • C and 200 mA cm −2 at a cutoff voltage of 1.6 V), in compared to that of pure FeS 2 (551.3 • C, 240 mA h g −1 ). Because CoS 2 is an excellent electrical conductor, the surface of FeS 2 is modified by CoS 2 , which leads to the change of the microstructure of FeS 2 surface, which enhances the intercalation of ionic electrolyte and enhances the electrical conductivity of FeS 2 . In the meantime, CoS 2 has high thermal stability and exhibits low solubility in the molten electrolyte, which reduces the elemental sulfur loss of FeS 2 during discharge and thereby increases the electrochemical capacity.

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Characterization of semiconducting properties of naturally occurring polycrystalline FeS2 (pyrite)

Cited by 7 publications

References 11 publications

Synthesis and Optoelectronic Properties of Two-Dimensional FeS₂ Nanoplates

Synthesis and Optoelectronic Properties of Two-Dimensional FeS₂ Nanoplates

Air Stable, Photosensitive, Phase Pure Iron Pyrite Nanocrystal Thin Films for Photovoltaic Application

CoS₂Coatings for Improving Thermal Stability and Electrochemical Performance of FeS₂Cathodes for Thermal Batteries

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Characterization of semiconducting properties of naturally occurring polycrystalline FeS2 (pyrite)

Cited by 7 publications

References 11 publications

Synthesis and Optoelectronic Properties of Two-Dimensional FeS2 Nanoplates

Synthesis and Optoelectronic Properties of Two-Dimensional FeS2 Nanoplates

Air Stable, Photosensitive, Phase Pure Iron Pyrite Nanocrystal Thin Films for Photovoltaic Application

CoS2Coatings for Improving Thermal Stability and Electrochemical Performance of FeS2Cathodes for Thermal Batteries

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Product

Resources

About

Synthesis and Optoelectronic Properties of Two-Dimensional FeS₂ Nanoplates

Synthesis and Optoelectronic Properties of Two-Dimensional FeS₂ Nanoplates

CoS₂Coatings for Improving Thermal Stability and Electrochemical Performance of FeS₂Cathodes for Thermal Batteries