Electrodeposition and characterization of a bamboo-like ZnSe/Zn heterostructure ordered array

Wang, Shuangming; Chi, Xiao; Shi, Xiaoming; Cui, Guangliang; Yao, Binbin; Wang, Pan; Tian, T; Zhang, Mingzhe

doi:10.1039/c3ra41829d

Cited by 2 publications

(2 citation statements)

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“…44,45 In almost all recent studies and applications of ZnSe semiconductors, ZnSe has been prepared using electrodeposition from aqueous baths. [46][47][48] A summary of the electrodeposition of ZnSe can be found in the literature. 49 * Electrochemical Society Active Member.…”

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confidence: 99%

“…44,45 In almost all recent studies and applications of ZnSe semiconductors, ZnSe has been prepared using electrodeposition from aqueous baths. [46][47][48] 28,29,[50][51][52][53] due to their advantageous properties, including good electrochemical and thermal stability, low or even negligible volatility, wide working temperature range, adjustable physicochemical properties, and good solubility for various precursors of electrodeposits. The wide electrochemical window of ILs allows the successful electrodeposition of various semiconductors without the decomposition of solvents or evolution of hydrogen.…”

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Voltammetric Study of Selenium and Two-Stage Electrodeposition of Photoelectrochemically Active Zinc Selenide Semiconductor Films in Ionic Liquid Zinc Chloride-1-Ethyl-3-Methylimidazolium Chloride

Pai

Hsieh

et al. 2015

J. Electrochem. Soc.

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Ionic liquid zinc chloride-1-ethyl-3-methylimidazolium chloride (IL ZnCl 2 -EMICl) with a ZnCl 2 /EMICl ratio of 40/60 mol% was used as the electrolyte to study the voltammetric behavior of Se(IV) introduced into the IL as selenium chloride (SeCl 4 ) or selenium oxide (SeO 2 ). The electrodeposition of ZnSe was performed using constant-potential electrolysis at tungsten electrodes via a two-stage approach from the IL with and without SeO 2 . The nucleation mechanism of Se at the tungsten electrodes agrees better with the three-dimensional instantaneous nucleation than the progressive nucleation based on Sharifker's model. Crystalline Se and approximately stoichiometric crystalline ZnSe electrodeposits could be obtained from this system. The ZnSe films showed photoelectrochemical activity with a bandgap energy of ∼2.5 eV. According to the experiments of the dependence of the photocurrent on the applied potential, the ZnSe film was determined to be a p-type semiconductor with the flatband potential V FB of −0. Zinc selenide (ZnSe) is a II-VI semiconductor that belongs to the chalcogenide family. ZnSe is usually obtained as a n-type semiconductor with a wide bandgap (2.67-2.7 eV). p-type ZnSe, which is very likely due to excess Se in the deposits, has been prepared using electrodeposition.1 ZnSe has been reported to be a useful material for various optoelectronic devices, such as lightemitting devices, window layers for solar cells, photovoltaic cells, laser screens, film transistors, photoelectrochemical cells, and optical components for infrared lasers. 19,25 Compared with these approaches, electrodeposition is more attractive [26][27][28][29] in terms of convenience, cost, and suitability for the large-scale production of thin films. Moreover, the surface morphology, composition, and properties of semiconductors can be flexibly controlled by adjusting the operating parameters such as electrodeposition potential or current, potential waveforms (constant potential or pulse potential), concentration of precursors, temperature, and additives. Therefore, ZnSe has been widely prepared using electrodeposition, with mostly successful results. Most electrodepositions of ZnSe were carried out cathodically in acidic aqueous baths containing Zn(II) and SeO 2 . [30][31][32][33][34][35][36][37] In acidic solutions, SeO 2 dissolves to form H 2 SeO 3 . ZnSe has also been electrodeposited from alkaline aqueous baths. [38][39][40] In alkaline solutions, Zn(II) and SeSO 3 2− are most frequently used as the precursors, and complexing agents, such as EDTA, are usually needed for forming strong complex ions with Zn 2+ to prevent the chemical precipitation of ZnSe, which is produced from the reaction between Zn(II) and SeSO 3 2− . Few studies have electrodeposited ZnSe from nonaqueous baths such as dimethylsulfoxide [41][42][43] and molten salts (CaCl 2 -NaCl at 550• C). 44,45 In almost all recent studies and applications of ZnSe semiconductors, ZnSe has been prepared using electrodeposition from aqueous baths. [46][47][48] 28,29,[50]...

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