Spray-coated ligand-free Cu2ZnSnS4 nanoparticle thin films

Sara Lena Josefin Engberg, Swathi Murthy, Guggi Kofod, Jørgen Schou

Research output: Contribution to conferenceConference abstract for conferenceResearchpeer-review

Abstract

We have fabricated Cu2ZnSnS4 (CZTS) thin films from spray-coating ligand-free nanoparticle inks. The as-synthesized CZTS nanoparticles were inherently ligand-free [1], which allows the use of polar solvents, such as water and ethanol. Another advantage of these particles is that user- and environmentally-friendly alkali metal chloride salts can be directly dissolved in controllable amounts. The homogeneous distribution of alkali metals in the ink allows uniform grain growth within the deposited absorber layer as a result of liquid phase assisted sintering. We find that particularly beneficial effects are seen by including potassium in the film. This produced micron-sized grains, an increased photoluminescence signal, and a bandgap of approx. 1.43 eV. The composition was Cu-poor and Zn-rich, and phase-pure kesterite CZTS was detected by Raman spectroscopy and X-ray diffraction (XRD) as well as an unquantifiable amount of ZnS. A Sono-tek spray-coating system is used which utilizes ultrasonic atomization. We investigate the effect of different binders, ink concentration, and spray-coating conditions, i.e. spray power, flow rate from syringe pump, distance between spray nozzle and the substrate, and time between consecutive spray layers for multiple layers. The spray-coated films are characterized by scanning electron microscopy (SEM), optical microscopy, and a Dektak profilometer.
Original languageEnglish
Publication date2017
Number of pages1
Publication statusPublished - 2017
Event8th European Kesterite Workshop - University of Barcelona , Barcelona , Spain
Duration: 8 Nov 201710 Nov 2017

Conference

Conference8th European Kesterite Workshop
LocationUniversity of Barcelona
CountrySpain
CityBarcelona
Period08/11/201710/11/2017

Cite this

Engberg, S. L. J., Murthy, S., Kofod, G., & Schou, J. (2017). Spray-coated ligand-free Cu2ZnSnS4 nanoparticle thin films. Abstract from 8th European Kesterite Workshop , Barcelona , Spain.
Engberg, Sara Lena Josefin ; Murthy, Swathi ; Kofod, Guggi ; Schou, Jørgen. / Spray-coated ligand-free Cu2ZnSnS4 nanoparticle thin films. Abstract from 8th European Kesterite Workshop , Barcelona , Spain.1 p.
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abstract = "We have fabricated Cu2ZnSnS4 (CZTS) thin films from spray-coating ligand-free nanoparticle inks. The as-synthesized CZTS nanoparticles were inherently ligand-free [1], which allows the use of polar solvents, such as water and ethanol. Another advantage of these particles is that user- and environmentally-friendly alkali metal chloride salts can be directly dissolved in controllable amounts. The homogeneous distribution of alkali metals in the ink allows uniform grain growth within the deposited absorber layer as a result of liquid phase assisted sintering. We find that particularly beneficial effects are seen by including potassium in the film. This produced micron-sized grains, an increased photoluminescence signal, and a bandgap of approx. 1.43 eV. The composition was Cu-poor and Zn-rich, and phase-pure kesterite CZTS was detected by Raman spectroscopy and X-ray diffraction (XRD) as well as an unquantifiable amount of ZnS. A Sono-tek spray-coating system is used which utilizes ultrasonic atomization. We investigate the effect of different binders, ink concentration, and spray-coating conditions, i.e. spray power, flow rate from syringe pump, distance between spray nozzle and the substrate, and time between consecutive spray layers for multiple layers. The spray-coated films are characterized by scanning electron microscopy (SEM), optical microscopy, and a Dektak profilometer.",
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Engberg, SLJ, Murthy, S, Kofod, G & Schou, J 2017, 'Spray-coated ligand-free Cu2ZnSnS4 nanoparticle thin films' 8th European Kesterite Workshop , Barcelona , Spain, 08/11/2017 - 10/11/2017, .

Spray-coated ligand-free Cu2ZnSnS4 nanoparticle thin films. / Engberg, Sara Lena Josefin; Murthy, Swathi; Kofod, Guggi; Schou, Jørgen.

2017. Abstract from 8th European Kesterite Workshop , Barcelona , Spain.

Research output: Contribution to conferenceConference abstract for conferenceResearchpeer-review

TY - ABST

T1 - Spray-coated ligand-free Cu2ZnSnS4 nanoparticle thin films

AU - Engberg, Sara Lena Josefin

AU - Murthy, Swathi

AU - Kofod, Guggi

AU - Schou, Jørgen

PY - 2017

Y1 - 2017

N2 - We have fabricated Cu2ZnSnS4 (CZTS) thin films from spray-coating ligand-free nanoparticle inks. The as-synthesized CZTS nanoparticles were inherently ligand-free [1], which allows the use of polar solvents, such as water and ethanol. Another advantage of these particles is that user- and environmentally-friendly alkali metal chloride salts can be directly dissolved in controllable amounts. The homogeneous distribution of alkali metals in the ink allows uniform grain growth within the deposited absorber layer as a result of liquid phase assisted sintering. We find that particularly beneficial effects are seen by including potassium in the film. This produced micron-sized grains, an increased photoluminescence signal, and a bandgap of approx. 1.43 eV. The composition was Cu-poor and Zn-rich, and phase-pure kesterite CZTS was detected by Raman spectroscopy and X-ray diffraction (XRD) as well as an unquantifiable amount of ZnS. A Sono-tek spray-coating system is used which utilizes ultrasonic atomization. We investigate the effect of different binders, ink concentration, and spray-coating conditions, i.e. spray power, flow rate from syringe pump, distance between spray nozzle and the substrate, and time between consecutive spray layers for multiple layers. The spray-coated films are characterized by scanning electron microscopy (SEM), optical microscopy, and a Dektak profilometer.

AB - We have fabricated Cu2ZnSnS4 (CZTS) thin films from spray-coating ligand-free nanoparticle inks. The as-synthesized CZTS nanoparticles were inherently ligand-free [1], which allows the use of polar solvents, such as water and ethanol. Another advantage of these particles is that user- and environmentally-friendly alkali metal chloride salts can be directly dissolved in controllable amounts. The homogeneous distribution of alkali metals in the ink allows uniform grain growth within the deposited absorber layer as a result of liquid phase assisted sintering. We find that particularly beneficial effects are seen by including potassium in the film. This produced micron-sized grains, an increased photoluminescence signal, and a bandgap of approx. 1.43 eV. The composition was Cu-poor and Zn-rich, and phase-pure kesterite CZTS was detected by Raman spectroscopy and X-ray diffraction (XRD) as well as an unquantifiable amount of ZnS. A Sono-tek spray-coating system is used which utilizes ultrasonic atomization. We investigate the effect of different binders, ink concentration, and spray-coating conditions, i.e. spray power, flow rate from syringe pump, distance between spray nozzle and the substrate, and time between consecutive spray layers for multiple layers. The spray-coated films are characterized by scanning electron microscopy (SEM), optical microscopy, and a Dektak profilometer.

M3 - Conference abstract for conference

ER -

Engberg SLJ, Murthy S, Kofod G, Schou J. Spray-coated ligand-free Cu2ZnSnS4 nanoparticle thin films. 2017. Abstract from 8th European Kesterite Workshop , Barcelona , Spain.