SYNTHESIS OF NANOCRYSTALLINE SnS FILMS BY CAPPING WITH PVA USING CBD PROCESS FOR SOLAR CELL APPLICATIONS – A COMPREHENSIVE OPTICAL STUDYP. Mallika Bramaramba Devi 1 ; K.T. Ramakrishna Reddy 2
Article Id - IJPTM_14_02_002, Pages : 10-17, Date of Publication : 17, November 2023
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Tin monosulphide (SnS) thin films capped by polyvinyl alcohol (PVA) were successfully synthesized on glass substrates using chemical bath deposition (CBD) at different bath temperatures varying in the range, 50 – 80 °C. Stannous chloride (SnCl2, 2H2O¬), thioacetamide (C2H5NS) were taken as precursors with tartaric acid (C4H6O6) as a complexing agent and polyvinyl alcohol [-CH2CHOH-]n as a capping agent for the synthesis of PVA capped SnS layers. Optical studies showed high optical absorption coefficient ~ 105 cm-1 for all the deposited layers and also the layers exhibited an optical band gap enhancement. The estimated band gap values were greater than the optical band gap of bulk SnS (1.3 ev). The observed blue shift in the optical band gap might be due to quantum confinement effect. The average particle size estimated using Brus equation, varied slightly from 5 nm to 9 nm. The other optical parameters such as refractive index, extinction coefficient, high frequency dielectric constant, optical carrier concentration, relaxation time and optical conductivity were also determined. The layers deposited at 80 °C bath temperature exhibited high optical conductivity (~ 1016 s-1) compared to other deposited layers, hence, such layers might be useful as an absorber layer in solar cell development.
Chemical Bath Deposition, Nanocrystalline Films, Optical Properties, PVA (Polyvinyl Alcohol), Tin Monosulphide (Sns).
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