Long-Term Convergence of Bulk- and Nano-Crystal Properties

Sergei, L.; Ballato, John

doi:10.5772/21418

Cited by 2 publications

(2 citation statements)

References 3 publications

(5 reference statements)

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“…Variation in band gap values is also known to occur in other amorphous semiconductors, e.g., amorphous, hydrogenated silicon. This was explained by different preparation conditions [49]. Different formation mechanisms can lead to differences in bond lengths and angles in an amorphous material, and therefore to a different mobility gap [46].…”

Section: Optical Characterizationmentioning

confidence: 99%

Revealing the formation mechanism and band gap tuning of Sb₂S₃ nanoparticles

Joschko

Wafo

Malsi

et al. 2021

Beilstein J. Nanotechnol.

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Sb2S3 is a promising nanomaterial for application in solar cells and in the fields of electronics and optoelectronics. Herein, Sb2S3 nanoparticles were prepared via the hot-injection approach. In contrast to earlier work, the reaction temperature was decreased to 150 °C so that the reaction was slowed down and could be stopped at defined reaction stages. Thereby, the formation mechanism of the nanomaterial and the associated kinetics could be revealed. Based on morphological and structural analyses, it is suggested that seed particles (type 0) formed immediately after injecting the antimony precursor into the sulfur precursor. These seeds fused to form amorphous nanoparticles (type I) that contained a lower percentage of sulfur than that corresponding to the expected stoichiometric ratio of Sb2S3. The reason for this possibly lies in the formation of an oxygen- or carbon-containing intermediate during the seeding process. Afterward, the type I nanoparticles aggregated into larger amorphous nanoparticles (type II) in a second hierarchical assembly process and formed superordinate structures (type III). This process was followed by the crystallization of these particles and a layer-like growth of the crystalline particles by an Ostwald ripening process at the expense of the amorphous particles. It was demonstrated that the kinetic control of the reaction allowed tuning of the optical band gap of the amorphous nanoparticles in the range of 2.2–2.0 eV. On the contrary, the optical band gap of the crystalline particles decreased to a value of 1.7 eV and remained constant when the reaction progressed. Based on the proposed formation mechanism, future syntheses for Sb2S3 particles can be developed, allowing tuning of the particle properties in a broad range. In this way, the selective use of this material in a wide range of applications will become possible.

show abstract

Section: Optical Characterizationmentioning

confidence: 99%

Revealing the formation mechanism and band gap tuning of Sb₂S₃ nanoparticles

Joschko

Wafo

Malsi

et al. 2021

Beilstein J. Nanotechnol.

View full text Add to dashboard Cite

show abstract

“…Variation in band gap values is also known to occur in other amorphous semiconductors, e.g., amorphous, hydrogenated silicon. This is explained by different preparation conditions [49]. Different formation mechanisms can lead to different bonding lengths and angles in an amorphous material and, therefore, to a different mobility gap [46].…”

Section: Optical Characterizationmentioning

confidence: 99%

Revealing the formation mechanism and band gap tuning of Sb₂S₃ nanoparticles

Joschko¹,

Wafo²,

Malsi³

et al. 2021

Preprint

View full text Add to dashboard Cite

Sb2S3 is a promising nanomaterial for application in solar cells and other fields of electronics and optoelectronics. Sb2S3 nanoparticles were prepared via the hot-injection approach. In contrast to earlier work, the reaction temperature was decreased to 150°C, so that the reaction was slowed down and could be stopped at defined reaction stages. Thereby, the formation mechanism of the nanomaterial and the associated kinetics could be revealed. Based on morphological and structural analysis, it is suggested that seed particles (type 0) form immediately after injecting the antimony precursor into the sulfur precursor. These seeds fuse to form amorphous nanoparticles (type I) that contain a lower percentage of sulfur than that corresponding to the expected stoichiometric ratio of Sb2S3. The reason for this possibly lies in the formation of an oxygen- or carbon-containing intermediate during the seeding process. Afterward, the type I nanoparticles aggregate into larger amorphous nanoparticles (type II) in a second hierarchical assembly process and form superordinated structures (type III). This process is followed by the crystallization of these particles and a layer-like growth of the crystalline particles by an Ostwald ripening process at the expense of the amorphous particles. It was demonstrated that the kinetic control of the reaction allows tuning of the optical bandgap of the amorphous nanoparticles in the range of 2.2 – 2.0 eV. On the contrary, the optical bandgap of the crystalline particles decreases to a value of 1.7 eV and remains constant when the reaction progresses. Based on the proposed formation mechanism, future syntheses for Sb2S3 particles can be developed, allowing tuning the particles' properties in a broad range. In this way, the selective use of this material in a wide range of applications will become possible.

show abstract

Long-Term Convergence of Bulk- and Nano-Crystal Properties

Cited by 2 publications

References 3 publications

Revealing the formation mechanism and band gap tuning of Sb₂S₃ nanoparticles

Revealing the formation mechanism and band gap tuning of Sb₂S₃ nanoparticles

Revealing the formation mechanism and band gap tuning of Sb₂S₃ nanoparticles

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Long-Term Convergence of Bulk- and Nano-Crystal Properties

Cited by 2 publications

References 3 publications

Revealing the formation mechanism and band gap tuning of Sb2S3 nanoparticles

Revealing the formation mechanism and band gap tuning of Sb2S3 nanoparticles

Revealing the formation mechanism and band gap tuning of Sb2S3 nanoparticles

Contact Info

Product

Resources

About

Revealing the formation mechanism and band gap tuning of Sb₂S₃ nanoparticles

Revealing the formation mechanism and band gap tuning of Sb₂S₃ nanoparticles

Revealing the formation mechanism and band gap tuning of Sb₂S₃ nanoparticles