Journal
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
Volume 121, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.mssp.2020.105433
Keywords
Thin films; Spin coating; Sulfidation free; Water splitting; Pt-free photoelectrochemical cell
Categories
Funding
- IIT (ISM)
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The physical and chemical properties of quaternary copper-barium-thiostannate (Cu2BaSnS4) compound were investigated in this study. Cu2BaSnS4 (CBTS) thin films were synthesized using a cost-effective sol-gel spin-coating technique, revealing a significant enhancement in photocurrent density under AM 1.5G condition. The p-type nature of CBTS was confirmed, and its suitability for harvesting solar energy was demonstrated through the fabrication of Pt free photoelectrochemical cells with ZnO nanorods as counter electrodes.
In this present work, investigation on the physical and chemical properties of the quaternary Cop-per-barium-thiostannate (Cu2BaSnS4) compound was carried out. Cu2BaSnS4(CBTS) thin films were synthesized by using the cost-effective, sol-gel spin-coating technique without further sulfurization. The light-sensitive nature of CBTS was investigated by illuminating the thin films directly under AM 1.5G condition, resulting in an enhancement of 47% in terms of photocurrent density. The p-type nature was confirmed from the Mott Schottky analysis carried out in 0.5 M Na2S solution without illumination. A flat band potential value of 2.354 +/- 0.003 V vs. RHE along with a carrier density of 9.314 x 10(19) cm(-3) and Debye length of 0.288 nm were also obtained for the CBTS thin films. From Bode plots, the carrier lifetime of CBTS films was estimated to be 88 m s. Further Pt free photoelectrochemical cells were fabricated by using ZnO nanorods as counter electrodes. From linear sweep voltammetry results, photocurrent density of 6.805 and 2.112 mA/cm(2) at 0 V (vs. RHE) under illumination in the presence of Pt electrodes and ZnO Nanorods, respectively. Photoconversion efficiency of similar to 10% and similar to 4% were estimated for the CBTS thin film in the presence of Pt and ZnO counter electrodes. Thus the physical properties observed here indicate the suitability of solution-processed CBTS thin films in its further use for harvesting solar energy.
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