Effect of ZnS coatings on the enhancement of the photovoltaic properties of PbS quantum dot-sensitized solar cells

Hachiya, Sojiro; Shen, Qing; Toyoda, Taro

doi:10.1063/1.4720468

Cited by 71 publications

(55 citation statements)

References 40 publications

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“…The material has huge potential application in both bulk and thin film form in various photovoltaic and optoelectronic devices 4 .It is used as key material for solar control coating, optoelectronic devices, electroluminescence devices, sensors and others 5 . ZnS is a prospective material to be used in solar cell as passivation layer for better photovoltaic properties 6 . Due to its high refractive index (n ~ 2.3), it can be used as an antireflective coating 7 .…”

Section: Introductionmentioning

confidence: 99%

Characterization of Sn Doped ZnS Thin Films Synthesized by CBD

Mukherjee

Mitra

2017

Mat. Res.

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Zinc sulphide (ZnS) thin film were prepared using chemical bath deposition (CBD) process and tin (Sn) doping was successfully carried out in ZnS. Structural, morphological and microstructural characterization was carried out using XRD, TEM, FESEM and EDX. XRD and SAED pattern confirms presence of hexagonal phase. Reitveld analysis using MAUD software was used for particle size estimation. A constantly decreasing trend in particle size was observed with increasing tin incorporation in ZnS film which was due to enhanced microstrain resulting for tin incorporation. The particle size of prepared hexagonal wurtzite ZnS was around 14-18 nm with average size of ~16.5 nm. The bandgap of the film increases from ~ 3.69 eV for ZnS to ~ 3.90 eV for 5% Sn doped ZnS film which might be due to more ordered hexagonal structure as a result of tin incorporation. Band gap tenability property makes Sn doped ZnS suitable for application in different optoelectronics devices. PL study shows variation of intensity with excitation wavelength and a red shift is noticed for increasing excitation wavelength.

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Section: Introductionmentioning

confidence: 99%

Characterization of Sn Doped ZnS Thin Films Synthesized by CBD

Mukherjee

Mitra

2017

Mat. Res.

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“…However, their synergistic contribution to the J sc is obvious although each of them was improved slightly. Although the higher J sc is comparable with that of other QDs-sensitized solar cells [22][23][24], V oc is too low due to the short distance between the conduction band of SnO 2 and the redox potential of polysulfide electrolyte used in QDSSCs leading to low conversion efficiency. Therefore, exploring a new electrolyte with a lower redox potential is necessary for improving conversion efficiency of PbS QDs-sensitized nanocrystalline SnO 2 thin film solar cells.…”

Section: Comparison Of the Two-phase Methods With Silarmentioning

confidence: 79%

Efficiency enhancement of PbS quantum dots-sensitized nanocrystalline SnO2 thin film prepared by two-phase method

Meng

Liu

Zhang

et al. 2015

J Solid State Electrochem

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A novel two-phase method was employed to directly deposit PbS quantum dots (QDs) on nanocrystalline SnO 2 thin films. In the two-phase method, the nanocrystalline SnO 2 thin film with adsorption of Pb 2+ ions was placed in an aqueous solution, and S 2− ions were dissolved in an oil solution. As two solutions were contacted, S 2− ions prefer to transfer to the aqueous solution and diffuse to the thin film surface with the adsorbed Pb 2+ ions to homogeneously form monodispersed PbS QDs on the nanocrystalline thin film. The homogeneous monodispersed QDs-sensitized thin film was used as a photoelectrode to fabricate QDs-sensitized solar cell. The loaded amount of PbS QDs and the thickness of ZnS passivation layer were optimized to obtain the highest light-toelectric conversion efficiency of 1.01 % under the simulated AM 1.5 illumination, which is increased by 61 % compared with that of the PbS QDs-sensitized solar cell employing the successive ionic layer adsorption and reaction (SILAR). The solar cell with homogeneous sensitization of QDs generates a photocurrent density of 11.09 mA·cm −2 , which is 2.4 times higher than that of the unhomogeneous one prepared by SILAR. The conversion efficiency enhancement mechanism due to the two-phase method was discussed in detail through the measurements of intensity-modulated photovoltage spectrum and electrochemical impedance spectroscopy.

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“…107 The effects of the ZnS surface passivation and the mechanism for improving the photovoltaic performance of QDSSCs were studied systematically and deeply. [108][109][110] Hachiya et al 109 studied the influences of ZnS passivation on charge transfer and recombination dynamics of QDSSCs, such as PbS QDSSCs using transient grating (TG) technique. Their results demonstrate that the ZnS passivation can enhance the charge injection efficiency largely because of the reduction of carrier trapping and recombination in PbS QDs after ZnS surface passivation.…”

Section: Surface Passivationmentioning

confidence: 99%

Recent progress on quantum dot solar cells: a review

2016

Self Cite

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Abstract. Semiconductor quantum dots (QDs) have a potential to increase the power conversion efficiency in photovoltaic operation because of the enhancement of photoexcitation. Recent advances in self-assembled QD solar cells (QDSCs) and colloidal QDSCs are reviewed, with a focus on understanding carrier dynamics. For intermediate-band solar cells using selfassembled QDs, suppression of a reduction of open circuit voltage presents challenges for further efficiency improvement. This reduction mechanism is discussed based on recent reports. In QD sensitized cells and QD heterojunction cells using colloidal QDs well-controlled heterointerface and surface passivation are key issues for enhancement of photovoltaic performances. The improved performances of colloidal QDSCs are presented. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Effect of ZnS coatings on the enhancement of the photovoltaic properties of PbS quantum dot-sensitized solar cells

Cited by 71 publications

References 40 publications

Characterization of Sn Doped ZnS Thin Films Synthesized by CBD

Characterization of Sn Doped ZnS Thin Films Synthesized by CBD

Efficiency enhancement of PbS quantum dots-sensitized nanocrystalline SnO2 thin film prepared by two-phase method

Recent progress on quantum dot solar cells: a review

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