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Modification of light absorption in thin CuInS2 films by sprayed Au nanoparticles.

Katerski A, Kärber E, Acik IO, Dolgov L, Mere A, Sildos I, Mikli V, Krunks M - Nanoscale Res Lett (2014)

Bottom Line: The prepared films show plasmonic light absorption with increasing intensity in the spectral range of 500- 800 nm when increasing the volume of HAuCl4 solution sprayed.When compared to bare CIS on glass, the absorptance was increased ca. 4.5 times in the case of glass/Au-NP/CIS and ca. 3 times in the case of glass/CIS/Au-NP configuration.The glass/Au-NP/CIS configuration had an advantage since Au-NP could be embedded without chemically damaging the CIS.

View Article: PubMed Central - PubMed

Affiliation: Laboratory of Thin Film Chemical Technologies, Department of Materials Science, Tallinn University of Technology, Tallinn, EE-19086, Estonia, atanas.katerski@ttu.ee.

ABSTRACT
The chemical spray pyrolysis method was used to deposit CuInS2 (CIS) thin films and Au nanoparticles (NPs) in two configurations: glass/Au-NP layer covered with CuInS2 film (Au-NP/CIS) and glass/CuInS2 films covered with Au-NP layer (CIS/Au-NP). According to X-ray diffraction (XRD), the spray of 2 mM HAuCl4 aqueous solution with a volume of 2.5 to 15 ml onto a glass substrate at 340°C results in metallic Au nanoparticles with a similar mean crystallite size in the range of 30 - 38 nm. The mean crystallite sizes remain in the range of 15 - 20 nm when grown onto a CIS film. The prepared films show plasmonic light absorption with increasing intensity in the spectral range of 500- 800 nm when increasing the volume of HAuCl4 solution sprayed. When compared to bare CIS on glass, the absorptance was increased ca. 4.5 times in the case of glass/Au-NP/CIS and ca. 3 times in the case of glass/CIS/Au-NP configuration. The glass/Au-NP/CIS configuration had an advantage since Au-NP could be embedded without chemically damaging the CIS.

No MeSH data available.


Related in: MedlinePlus

Optical absorptance spectra of CIS film on glass (ref) and of CIS/Au-NP nanocomposite films on glass. Au nanoparticles were formed by spraying 2 mM HAuCl4 aqueous solution with a volume of 2.5, 10, and 15 ml at 340°C onto the CIS film grown at 310°C.
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Fig7: Optical absorptance spectra of CIS film on glass (ref) and of CIS/Au-NP nanocomposite films on glass. Au nanoparticles were formed by spraying 2 mM HAuCl4 aqueous solution with a volume of 2.5, 10, and 15 ml at 340°C onto the CIS film grown at 310°C.

Mentions: The optical absorptance spectra of the Au-NP/CIS and CIS/Au-NP layers are presented in Figures 6 and 7, respectively. An additional band appears in the absorptance spectrum of Au-NP/CIS samples between 500 and 800 nm (Figure 6) when compared to the absorptance of the CIS reference film without any embedded Au-NP (denoted as 0 ml, reference). The additional absorption band is attributed to the surface plasmon effect [6, 25]. Here, the Au nanoparticles act as a grid that preferentially diffuses light into the CIS. The use of 2.5- or 5-ml volume of the Au precursor solution results in absorptance up to 30% at 650 nm, while the use of 15-ml solution show further increase up to 45% at ca. 600 nm. In the latter, Au nanoparticles are up to four times larger in size (Table 1, Glass/Au-NP) which result in a more dense surface coverage when compared to Au coverage in layers deposited at lower volumes. Since the absorptance A was calculated as A = 100% - (R + T), where the total reflectance R and the total transmittance T include the diffused light, the effect of the surface morphology on the absorptance has been minimized. Thus, a more dense arrangement due to the larger gold particles is likely to cause the strong absorption gain in the case of the 15-ml volume used (Figures 6).


Modification of light absorption in thin CuInS2 films by sprayed Au nanoparticles.

Katerski A, Kärber E, Acik IO, Dolgov L, Mere A, Sildos I, Mikli V, Krunks M - Nanoscale Res Lett (2014)

Optical absorptance spectra of CIS film on glass (ref) and of CIS/Au-NP nanocomposite films on glass. Au nanoparticles were formed by spraying 2 mM HAuCl4 aqueous solution with a volume of 2.5, 10, and 15 ml at 340°C onto the CIS film grown at 310°C.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4493990&req=5

Fig7: Optical absorptance spectra of CIS film on glass (ref) and of CIS/Au-NP nanocomposite films on glass. Au nanoparticles were formed by spraying 2 mM HAuCl4 aqueous solution with a volume of 2.5, 10, and 15 ml at 340°C onto the CIS film grown at 310°C.
Mentions: The optical absorptance spectra of the Au-NP/CIS and CIS/Au-NP layers are presented in Figures 6 and 7, respectively. An additional band appears in the absorptance spectrum of Au-NP/CIS samples between 500 and 800 nm (Figure 6) when compared to the absorptance of the CIS reference film without any embedded Au-NP (denoted as 0 ml, reference). The additional absorption band is attributed to the surface plasmon effect [6, 25]. Here, the Au nanoparticles act as a grid that preferentially diffuses light into the CIS. The use of 2.5- or 5-ml volume of the Au precursor solution results in absorptance up to 30% at 650 nm, while the use of 15-ml solution show further increase up to 45% at ca. 600 nm. In the latter, Au nanoparticles are up to four times larger in size (Table 1, Glass/Au-NP) which result in a more dense surface coverage when compared to Au coverage in layers deposited at lower volumes. Since the absorptance A was calculated as A = 100% - (R + T), where the total reflectance R and the total transmittance T include the diffused light, the effect of the surface morphology on the absorptance has been minimized. Thus, a more dense arrangement due to the larger gold particles is likely to cause the strong absorption gain in the case of the 15-ml volume used (Figures 6).

Bottom Line: The prepared films show plasmonic light absorption with increasing intensity in the spectral range of 500- 800 nm when increasing the volume of HAuCl4 solution sprayed.When compared to bare CIS on glass, the absorptance was increased ca. 4.5 times in the case of glass/Au-NP/CIS and ca. 3 times in the case of glass/CIS/Au-NP configuration.The glass/Au-NP/CIS configuration had an advantage since Au-NP could be embedded without chemically damaging the CIS.

View Article: PubMed Central - PubMed

Affiliation: Laboratory of Thin Film Chemical Technologies, Department of Materials Science, Tallinn University of Technology, Tallinn, EE-19086, Estonia, atanas.katerski@ttu.ee.

ABSTRACT
The chemical spray pyrolysis method was used to deposit CuInS2 (CIS) thin films and Au nanoparticles (NPs) in two configurations: glass/Au-NP layer covered with CuInS2 film (Au-NP/CIS) and glass/CuInS2 films covered with Au-NP layer (CIS/Au-NP). According to X-ray diffraction (XRD), the spray of 2 mM HAuCl4 aqueous solution with a volume of 2.5 to 15 ml onto a glass substrate at 340°C results in metallic Au nanoparticles with a similar mean crystallite size in the range of 30 - 38 nm. The mean crystallite sizes remain in the range of 15 - 20 nm when grown onto a CIS film. The prepared films show plasmonic light absorption with increasing intensity in the spectral range of 500- 800 nm when increasing the volume of HAuCl4 solution sprayed. When compared to bare CIS on glass, the absorptance was increased ca. 4.5 times in the case of glass/Au-NP/CIS and ca. 3 times in the case of glass/CIS/Au-NP configuration. The glass/Au-NP/CIS configuration had an advantage since Au-NP could be embedded without chemically damaging the CIS.

No MeSH data available.


Related in: MedlinePlus