Fabrication of porous ZnO via electrochemical etching using 10wt% potassium hydroxide solution

Ching, C. G.; Ooi, P. K.; Ng, Sha Shiong; Ahmad, M.A.; Hassan, Z.; Hassan, H. Abu; Abdullah, M.J.

doi:10.1016/j.mssp.2012.06.017

Cited by 14 publications

(5 citation statements)

References 23 publications

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“…Recently, some attention has been paid to the synthesis of porous ZnO by using various methods such as thermal decomposition method, template assisted methods, hydrothermal method, solid-vapor process, radio frequency sputtering, electrochemical deposition, etc. [13][14][15]. To the best of our knowledge, an easy and economical method to prepare porous ZnO is not addressed so far.…”

Section: mentioning

confidence: 99%

Synthesis and optical characterization of porous ZnO

et al. 2013

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Abstract:In this paper, a simple and cheap method to prepare porous ZnO by using zinc nitrate, ethanol and triethanolamine (TEA) is reported. The as-prepared sample consisted of nano and micro pores. The sample was calcined at 300 ℃, 400 ℃ and 500 ℃ with different heating rates. At 500 ℃, the nano pores disappeared but the sample maintained its micro porosity. Field emission scanning electron microscopy (FE-SEM) pictures confirmed that the size and growth of ZnO nanoparticles depended on the heating conditions. The infrared (IR) absorption peak of Zn-O stretching vibration positioned at 457 cm 1 was split into two peaks centered at 518 cm 1 and 682 cm 1 with the change of morphology. These results confirmed that Fourier transform infrared (FT-IR) spectrum was sensitive to variations in particle size, shape and morphology. The photoluminescence (PL) spectrum of porous ZnO contained five emission peaks at 397 nm, 437 nm, 466 nm, 492 nm and 527 nm. Emission intensity enhanced monotonously with increase of temperature and the change was rapid between temperatures of 300 ℃ and 500 ℃. This was due to the elimination of organic species and improvement in the crystallanity of the sample at 500 ℃.

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Section: mentioning

confidence: 99%

Synthesis and optical characterization of porous ZnO

et al. 2013

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“…It is well known that OHcan attack and remove ZnO particles from ZnO surface. Due to slow reaction rate, fine structure is formed according relation [5]; From the Image-J analysis, it was found that pore density are 4.55, 5.92, 6.35 and 2.40 pore/µm 2 for immersing time of 0, 2, 4 and 6 min, respectively. These result indicated that larger pore density will support more dye loading in the treated films.…”

Section: Resultsmentioning

confidence: 99%

KOH Treatment of Photoanode on Photovoltaic Properties of ZnO Based Dye-Sensitized Solar Cell

Sujinnapram

Moungsrijun

2016

KEM

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ZnO films were deposited on fluorine doped tin oxide glass substrate and chemically treated by KOH solutions. The films were immersed into 2 M KOH solution with various immersing time of 0-6 min at room temperature, rinsed and thermally treated. Small pore size was observed for treated films by scanning electron microscopy indicated that dense ZnO particles were removed. Eosin-Y sensitizer was loaded into treated photoanode using re-adsorption technique. The photovoltaic characteristics were investigated under standard light illumination (AM1.5). Short circuit current densities are not much changed for 0-4 min treatment. After then, it is rapidly decreased for 6 min treatment. Open-circuit voltage, fill factor and shunt resistance are increased after treatment. In addition, increased charge transfer resistance indicated that recombination is reduced by KOH solution treatment. The reduced recombination contributes efficient electrons transport through external circuit. These improvements resulting efficiency reached maximum value of 0.72% at 4 min treatment, compared with pristine cell efficiency of 0.64%.

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“…Moreover, porous spaces of silicon [42,43], germanium [44], zinc oxide, etc. are obtained using a given method [45]. However, all these papers fail to provide a general idea about the mechanisms of formation of a porous layer during electrochemical treatment.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%