Hossein Roshan

Core-shell nanofibers as resistive gas sensors: A review

Mahkameh Abedzadeh, Parnian Dehghani, Ali Mirzaei, Hossein Roshan et autres

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Large Colloidal InAs Nanocrystals Synthesized with a Grignard Reagent

Guncem Ozgun Eren, Houman Bahmani Jalali, Hossein Roshan, Mauro Garbarino et autres

Colloidal nanocrystals (NCs) active in the near-infrared (NIR) region are appealing for a variety of applications, such as machine vision, hyperspectral imaging, and medical diagnosis. Among the various classes of NIR-active NCs, InAs stands out as one of the most viable compositions …

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Highly Selective H 2 S Gas Sensing Based on InAs-ZnSe Core-Shell Quantum Dots

Anh-Duy Hoang Nguyen, Hossein Roshan, Guncem Ozgun Eren, Sirous Khabbaz Abkenar et autres

Indium arsenide (InAs) gas sensors are conventionally fabricated using epitaxial methods, which rely on costly equipment and are less suitable for low-cost manufacturing; therefore, the number of studies on InAs-based gas sensors has remained limited. In this paper, we report the gas-sensing …

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Short-Wave Infrared InAs Quantum-Dot Light-Emitting Diodes with Tunable Electroluminescence beyond 1.4 μm

Hossein Roshan, Davide Mazza, S. Panda, Francesco De Boni et autres

Short-wave infrared (SWIR) optoelectronics based on colloidal quantum dots (QDs) have been dominated by heavy-metal chalcogenides for many years (e.g., PbS, HgTe). Here, we present Restriction of Hazardous Substances-compliant InAs/ZnSe core/shell QD light-emitting diodes (LEDs) operating in the SWIR spectral range. The …

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RoHS‐Compliant, Cu‐Zn‐In‐Se‐Based Core/Multi‐shell Quantum Dots with Efficient and Tunable Short‐Wave Infrared Emission

Avijit Saha, Hossein Roshan, René Hübner, Angelika Wrzesińska et autres

Abstract Solution‐processed quantum dots (QDs) that absorb and emit in the short‐wave infrared (SWIR) region are paramount in optoelectronics and biological imaging. However, most of the efficient SWIR‐emitting QDs contain heavy metals including Pb and Hg, which are highly toxic and therefore …

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Improving the Stability of Colloidal CsPbBr3 Nanocrystals with an Alkylphosphonium Bromide as Surface Ligand Pair

Meenakshi Pegu, Hossein Roshan, Clara Otero‐Martínez, Luca Goldoni et autres

High Resolution Image Download MS PowerPoint Slide In this study, we synthesized a phosphonium-based ligand, trimethyl(tetradecyl)phosphonium bromide (TTP-Br), and employed it in the postsynthesis surface treatment of Cs-oleate-capped CsPbBr 3 nanocrystals (NCs). The photoluminescence quantum yield (PLQY) of the NCs increased from …

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Short-Wave Infrared Optoelectronics with Colloidal CdHgSe/ZnCdS Core/Shell Nanoplatelets

Hossein Roshan, Anatol V. Prudnikau, Jinfei Dai, Matilde Cirignano et autres

High Resolution Image Download MS PowerPoint Slide Colloidal semiconductor nanocrystals (NCs) are an efficient and cost-effective class of nanomaterials for optoelectronic applications. Advancements in NC-based optoelectronic devices have resulted from progress in synthetic chemistry, adjustable surface properties, and optimized device architectures. Semiconductor …

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Infrared Optoelectronics based on Colloidal Nanocrystals

Hossein Roshan, Anatol V. Prudnikau, Dongxu Zhu, Luca De Trizio et autres

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Blue CdSe/CdS core/crown nanoplatelet light-emitting diodes obtained via a design-of-experiments approach

Matilde Cirignano, Hossein Roshan, Emanuele Farinini, Alessio Di Giacomo et autres

= 460 nm), we fabricated light-emitting diodes (LEDs) with narrowband (16 nm) blue electroluminescence, an external quantum efficiency of 1.3% and low turn-on voltage of 2.9 V after DoE optimization. Our findings show that NPLs are a promising system to obtain LEDs …

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Near Infrared Light‐Emitting Diodes Based on Colloidal InAs/ZnSe Core/Thick‐Shell Quantum Dots

Hossein Roshan, Dongxu Zhu, Davide Piccinotti, Jinfei Dai et autres

Abstract Heavy‐metal‐free III–V colloidal quantum dots (QDs) exhibit promising attributes for application in optoelectronics. Among them, InAs QDs are demonstrating excellent optical performance with respect to absorption and emission in the near‐infrared spectral domain. Recently, InAs QDs attained a substantial improvement in …

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Partial Ligand Stripping from CsPbBr3 Nanocrystals Improves Their Performance in Light-Emitting Diodes

Jinfei Dai, Hossein Roshan, Manuela De Franco, Luca Goldoni et autres

Halide perovskite nanocrystals (NCs), specifically CsPbBr 3, have attracted considerable interest due to their remarkable optical properties for optoelectronic devices. To achieve high-efficiency light-emitting diodes (LEDs) based on CsPbBr 3 nanocrystals (NCs), it is crucial to optimize both their photoluminescence quantum yield …

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Room temperature ethanol sensors using V2O5 nanoparticles annealed at different temperatures

Vahid Amiri, Ali Mirzaei, Hossein Roshan, Mohammad Hossein Sheikhi

In this work V2O5 nanoparticles (NPs) were synthesized via a facile Pechini sol-gel route from NH4VO3. The as-synthesized amorphous NPs were annealed at three different temperatures, i.e. 350, 450 and 550 ?C for 2 h, to study the effect of annealing temperature …

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