Structural, optical and electrical properties of undoped and Li-doped NiO thin films prepared by sol–gel spin coating method

Sta, I.; Jlassi, M.; Hajji, M.; Ezzaouia, Hatem

doi:10.1016/j.tsf.2013.10.137

Cited by 54 publications

(26 citation statements)

References 19 publications

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“…In experimental process, forming of powder micro crystallites on surface of films was seen with increasing molarity above 0.1 M, thus we can conclude that a micro crystallite structure may introduce a decrease in crystallinity. In the literature, as similar to our results, Purushothaman et al [19] also found that increasing dip coating layer number caused an increment in the film crystallinity for 0.15 M NiO films, however Sta et al [7] and Jlassi et al [14] observed that increasing spin layer number caused a decrease in the film crystallinity for 0.5 M NiO films.…”

Section: Crystalline Propertiessupporting

confidence: 90%

“…A decrease in E g and transmittance values with molarity may be derived from increasing Ni ions in films [17] and incorporated oxygen atoms replaced interstitial and substitutional sites in the structure [14]. As similar to our study, some researchers [7,14,19] reported that the values of E g for NiO films dropped off with the increasing sol-gel spin and dip coating layer.…”

Section: Optical Propertysupporting

confidence: 89%

“…In recent years, nickel oxide (NiO) which is a member of transition metal oxides has been greatly used in many apparatus [1] such as magnetic materials, catalysts, smart windows, solar cells [2][3][4][5] as well as electrochromic devices [6] because of its thermal and chemical insistence, low cost, superior electrical, optical and antiferromagnetic properties [7][8][9]. NiO, one of a few p-type metal oxide semiconductors, has a large band gap varied between 3.6 to 4.0 eV [10].…”

Section: Introductionmentioning

confidence: 99%

“…[13][14][15][16]. Among these, spin coating is more functional technique owing to its simplicity, safety, low cost and ability to deposit homogenous and good quality films [7,17]. In a sol-gel spin coating deposition process, the properties of studied material may be tailored by growth parameters such as sol-gel chemistry, spin velocity, drying and annealing temperature and deposition ambient.…”

Section: Introductionmentioning

confidence: 99%

“…[18]. In the literature, NiO thin films have been grown as functions of spin layer number [7,14,19], sol-solution pH [20], annealing temperature [4,9,14,21], solvent type [22] and annealing ambient [14] in order to understand the effect of solgel spin coating growth parameters on the features of NiO films. However, according to our best knowledge, there has been no report on the fabrication of NiO film depending on sol-gel precursor solution molarity and there is only one study on effect of solution solvent type.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Determination of certain sol-gel growth parameters of nickel oxide films

Turgut

Sönmez

Duman

2015

Ceramics International

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Section: Crystalline Propertiessupporting

confidence: 90%

Section: Optical Propertysupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Determination of certain sol-gel growth parameters of nickel oxide films

Turgut

Sönmez

Duman

2015

Ceramics International

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One‐Step Self‐Assembly Fabrication of High Quality Ni_xMg_1‐xO Bowl‐Shaped Array Film and Its Enhanced Photocurrent by Mg,²⁺ Doping

Zhao

Gao

et al. 2015

Adv Funct Materials

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wileyonlinelibrary.combath deposition, [ 7 ] and electrochemical deposition [ 8 ] can be used to fabricate NiO and metal ions doped NiO fi lms, they usually involve either expensive equipments or complex fabrication procedures. [ 9 ] Recently, the bottom-up self-assembly has attracted considerable interest as a potential alternative to conventional top-down processes for the scalable, low-cost syntheses of nanoporous solid structures. [ 10 ] Monolayer, bilayer, or multilayer colloidal fi lm-based nanodevices have been reported by the oil-water interfacial self-assemble strategy. [ 11,12 ] Moreover, this method can be further extended for fabrication of high performance porous nanofi lm-based optoelectronic devices due to large surface-to-volume ratio and effi cient light harvest. [ 13 ] Nevertheless, the whole process seems to be complicated, including the self-assembly and drying of polymer colloidal spheres, the infi ltration of metal oxide precursors, the calcination and so on. Accordingly, a more facile method for fabrication of well-ordered pore nanofi lms for optoelectronic nanodevices is highly desired.In this study, we present the fi rst Ni x Mg 1 -x O bowl-shaped array fi lm by one-step self-assembly of monodisperse polystyrene (PS) colloid spheres and metal oxide precursors at oilwater interface and further construct the array fi lm-based optoelectronic device. Our approach at least has several prominent features: i) Unlike previous fabrication procedures, the crystal nuclei of the metal oxide precursors can directly self-assemble on the bottom surfaces of the organizing PS spheres to form a bowl-shaped nanofi lm. This greatly decreases the steps of fabrication. ii) Through this simple process, it is easy to realize the doping of other metal ions, which may tune the optoelectronic properties of the semiconducting fi lm-based nanodevices. iii) Compared with undoped NiO fi lms, doping of Mg 2+ significantly enhances the current and spectrum responsivity of NiO fi lm-based nanodevice. Results and Discussion Fabrication and Structure of Nix Mg 1 -x O Bowl-Shaped Array Films Scheme 1 briefl y describes the fabrication procedures of bowlshaped Ni x Mg 1 -x O nanofi lm and its corresponding optoelectronic device. Pure Ni(NO 3 ) 2 ·6H 2 O, or the mixture of Mg(NO 3 ) 2 ·6H 2 O and Ni(NO 3 ) 2 ·6H 2 O (mole ratios of Mg/(Mg+Ni): 0.05, 0.1, 0.2, A series of high quality Ni x Mg 1 -x O bowl-shaped array fi lms are successfully prepared by a simple one-step assembly of polystyrene colloidal spheres and metal oxide precursors at oil-water interface, and further used to fabricate nanodevices. The doping of Mg 2+ can greatly enhance the current and spectrum responsivity of NiO fi lm-based nanodevice. The maximum R λ value of these bowl-shaped Ni x Mg 1 -x O fi lm-based devices measured in the study shows 4-5 orders of enhancement than the previously reported Ni x Mg 1 -x O fi lm at equal doping.

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The Effect of Lithium Doping in Solution‐Processed Nickel Oxide Films for Perovskite Solar Cells

et al. 2019

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The effect of substitutional Li doping into NiOx hole transporting layer (HTL) for use in inverted perovskite solar cells was systematically studied. Li doped NiOx thin films with preferential crystal growth along the (111) plane were deposited using a simple solution‐based process. Mott‐Schottky analysis showed that hole carrier concentration (NA) is doubled by Li doping. Utilizing 4 % Li in NiOx improved the power conversion efficiency (PCE) of solar devices from 9.0 % to 12.6 %. Photoluminescence quenching investigations demonstrate better hole capturing properties of Li:NiOx compared to that of NiOx, leading to higher current densities by Li doping. The electrical conductivity of NiOx is improved by Li doping. Further improvements of the device were made by using an additional ZnO layer onto PCBM, to remove shunt paths, leading to a PCE of 14.2 % and a fill factor of 0.72.

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Structural, optical and electrical properties of undoped and Li-doped NiO thin films prepared by sol–gel spin coating method

Cited by 54 publications

References 19 publications

Determination of certain sol-gel growth parameters of nickel oxide films

Determination of certain sol-gel growth parameters of nickel oxide films

One‐Step Self‐Assembly Fabrication of High Quality Ni_xMg_1‐xO Bowl‐Shaped Array Film and Its Enhanced Photocurrent by Mg,²⁺ Doping

The Effect of Lithium Doping in Solution‐Processed Nickel Oxide Films for Perovskite Solar Cells

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Structural, optical and electrical properties of undoped and Li-doped NiO thin films prepared by sol–gel spin coating method

Cited by 54 publications

References 19 publications

Determination of certain sol-gel growth parameters of nickel oxide films

Determination of certain sol-gel growth parameters of nickel oxide films

One‐Step Self‐Assembly Fabrication of High Quality NixMg1‐xO Bowl‐Shaped Array Film and Its Enhanced Photocurrent by Mg,2+ Doping

The Effect of Lithium Doping in Solution‐Processed Nickel Oxide Films for Perovskite Solar Cells

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Product

Resources

About

One‐Step Self‐Assembly Fabrication of High Quality Ni_xMg_1‐xO Bowl‐Shaped Array Film and Its Enhanced Photocurrent by Mg,²⁺ Doping