Study of synthesis and characterization of bismuth oxyiodide thin film for non- toxic perovskite solar cells
Perovskite solar cells based on lead halide has demonstrated the fast increase in efficiency and advanced in photovoltaic technology in the last decade. However, perovskite solar cells that contain lead (Pb) has high efficiency but tangible risk to humans, animals, and the environment. Bismuth oxy...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Penerbit Universiti Kebangsaan Malaysia
2021
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| Online Access: | http://journalarticle.ukm.my/19070/1/12.pdf http://journalarticle.ukm.my/19070/ https://www.ukm.my/jkukm/si-41-2021/ |
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| Summary: | Perovskite solar cells based on lead halide has demonstrated the fast increase in efficiency and advanced in photovoltaic
technology in the last decade. However, perovskite solar cells that contain lead (Pb) has high efficiency but tangible risk
to humans, animals, and the environment. Bismuth oxyiodide (BiOI) has been recognized as a suitable candidate of
non-toxic material to replace lead without adversely impacting performance in perovskite solar cells. The interest in
application of BiOI thin films is because BiOI has narrow band gap, high efficiency light absorption and high photo
catalytic activity makes it the perfect contender to replace Pb as new non-toxic material perovskite solar cell. Thin films
of BiOI were synthesized and deposited using Successive Ionic Layer Adsorption and Reaction (SILAR) on glass
substrates. The same mole ratios of bismuth(III) nitrate pentahydrate (Bi(NO3).5H2O) and potassium iodide (KI) were
diluted in deionized water to achieve clear solution. The microscope glass was dipped consecutively in 0.01M of
(BiNO3)2.5H2O diluted in deionized water, 0.01M of (KI) diluted deionized water and in 50 ml deionized water. This
process has been repeated for 30 times and finally the sample was dripped and dried in air. The sample was annealed at
various annealing temperature from 250 °C, 350 °C, 450 °C, and 550 °C for 20 minutes. The optical properties and
structural properties of BiOI thin films were characterized using X-ray powder diffraction (XRD), Ultraviolet-visible
(UV-Vis) measurement and Field Emission Scanning Electron Microscope (FESEM). The Surface Profilometer (SP) was
used to measure the thin films thickness. The structure of the films changed with the annealling temperature. The color
of the film changes to the orange-yellow and become more yellowish with increasing annealing temperature. The
morphology of FESEM images demonstrated that the BiOI thin films have flakes morphology structure with the size
around 1μm. The deposited film thickness ranged between 3.479 μm and 8.082 μm. This study provided significant
output and a pathway for non-toxic BiOI thin film for perovskite solar cells. |
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