Optical properties and carrier dynamics in Co-doped ZnO nanorods

Sivan, Aswathi K.; Galán-González, Alejandro; Mario, Lorenzo Di; Tappy, Nicolas; Hernández‐Ferrer, Javier; Catone, Daniele; Turchini, S.; Benito, Ana M.; Maser, Wolfgang K.; Steinvall, Simon Escobar; Morral, Anna Fontcuberta i; Gallant, Andrew J.; Zeze, Dagou A.; Atkinson, D.; Martelli, F.

doi:10.1039/d0na00693a

Cited by 8 publications

(1 citation statement)

References 54 publications

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“…, Al, Ga, In) ion complexes acting as differential capping agents on the surfaces of ZnO NWs through attractive electrostatic interactions and hence adjusting their aspect ratio from 0.1 to 100 . More recently, chemical additives containing the dopant such as metal nitrate [ e.g ., Al nitrate (Al(NO 3 ) 3 ), Ga nitrate (Ga(NO 3 ) 3 ), Cu nitrate (Cu(NO 3 ) 2 ), Ni nitrate (Ni(NO 3 ) 2 ), and Co nitrate (Co(NO 3 ) 2 )] − or metal glycolate ( e.g. , Sb glycolate) have been introduced to control the physical properties of ZnO NWs.…”

Section: Introductionmentioning

confidence: 99%

Single and Co-Doping of ZnO Nanowires with Al and Cl Using One Precursor by Chemical Bath Deposition

et al. 2023

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The simultaneous cationic and anionic co-doping of ZnO nanowires grown by chemical bath deposition offers great promise to optimize the performance of engineering devices, but its development has not been achieved yet. Here, we explore the single doping with Al and Cl using Al(NO3)3 and NH4Cl as chemical additives to investigate their effect on the morphology and properties of ZnO nanowires, and we extend the approach to their simultaneous co-doping using AlCl3 as the only chemical additive. The single and co-doping processes of ZnO nanowires with Al and Cl are achieved in the high-pH region regardless of the chemical additive, where Al(OH)4 – complexes and Cl– ions are predominantly formed and readily adsorb on the positively charged m-plane sidewalls through attractive electrostatic forces. Using the simultaneous co-doping approach, we reveal significant interplay effects between Al(III) and Cl(I) species through competitive adsorption and incorporation processes. Both Al(III) and Cl(I) species act as capping agents, but the former predominantly affect the morphology of ZnO nanowires over the latter and its presence on their surfaces is more pronounced. The incorporation of Al dopants is further found to be larger than the incorporation of Cl dopants owing to energetic considerations. Interestingly, the thermal annealing under oxygen atmosphere usually performed to activate the Al doping of ZnO nanowires results in the opposite migration processes of Al dopants toward the bulk and of Cl dopants toward their surfaces. Eventually, the formation of hydrogen-related defects including interstitial hydrogen and VZn-nH complexes is more impacted by Al doping than by Cl doping. These findings report the simultaneous cationic and anionic co-doping of ZnO nanowires with Al and Cl using one single chemical additive as an additional way to tune their physical properties and facilitate their integration into engineering devices.

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Section: Introductionmentioning

confidence: 99%

Single and Co-Doping of ZnO Nanowires with Al and Cl Using One Precursor by Chemical Bath Deposition

et al. 2023

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Exploring Ultrafast Carrier Dynamics in Photoelectrochemical Water Splitting Using Transient Absorption Spectroscopy

Sivan,

Galán‐González

2024

Part & Part Syst Charact

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Hydrogen fuel produced from water splitting using sunlight remains one of the cleanest and most sustainable energy sources. However, photoelectrochemical hydrogen production faces several challenges, including poor sunlight absorption, deficient charge carrier lifetime and transfer rates, and very sluggish kinetics of the water oxidation half‐reaction. To address these challenges, researchers have concentrated on enhancing the efficiency of photoelectrochemical water splitting. A critical factor in this enhancement is a deeper understanding of the fundamental processes involved in photoabsorption and the subsequent oxidation evolution reaction. The advent of ultrafast lasers has enabled the detailed tracking of charge carriers within materials after sunlight absorption, including their separation and migration to the surface for water oxidation. Ultrafast transient absorption spectroscopy is a powerful technique that allows real‐time observation of the behavior of excited states and charge carriers on femtosecond to nanosecond timescales. Recent studies utilizing ultrafast transient absorption spectroscopy are explored to investigate the dynamics of charge carriers in photoelectrochemical water splitting, providing insights into the mechanisms that lead to the design of enhanced photoanodes with improved efficiency.

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Enhanced photocatalytic activity and ferromagnetic ordering in hydrogenated Zn1−xCoxO

Petrov,

Dang,

et al. 2024

J Mater Sci

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Optical properties and carrier dynamics in Co-doped ZnO nanorods

Abstract: Optoelectronic and photoelectrochemical characterization of Co-doped ZnO nanorods revealing the crucial role of surface defects for enhanced photoresponse.

Cited by 8 publications

References 54 publications

Single and Co-Doping of ZnO Nanowires with Al and Cl Using One Precursor by Chemical Bath Deposition

Single and Co-Doping of ZnO Nanowires with Al and Cl Using One Precursor by Chemical Bath Deposition

Exploring Ultrafast Carrier Dynamics in Photoelectrochemical Water Splitting Using Transient Absorption Spectroscopy

Enhanced photocatalytic activity and ferromagnetic ordering in hydrogenated Zn1−xCoxO

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