Ariful Islam , Raisa Tahiyah , Md. Ruman Sheikh , Muhtasim Al Muyeed Jim , Md. Jahidul Islam , Mainul Hossain , Samia Subrina , Fahmida Gulshan
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XPS results ensure that the desired composition is achieved. UV–vis spectroscopy data show that optical bandgap increases with Al-Mg co-doping, leading to the highest bandgap for Ti<sub>0.87</sub>Mg<sub>0.1</sub>Al<sub>0.03</sub>O<sub>2,</sub> which also has the highest transmittance peak, reaching 90 % in the visible region. Urbach energies are also calculated to get a better estimate of the effective bandgaps. Band edge positions are calculated using Mulliken’s electronegativity, demonstrating improved band alignment due to Al-Mg co-doping. The bandgap trend is further corroborated with DFT + U simulations, which show that calculated bandgaps match the experimentally obtained optical bandgaps. Additionally, density of states reveal that Ti 3d orbital dominates the conduction band and O 2p orbital dominates the valence band, with hybridization taking place between different orbitals. Four-point probe test demonstrates that Al-Mg co-doping leads to a consistent decrease in sheet resistance of the thin film. Better band alignment and higher visible light transmittance combined with enhanced conductivity indicate that Al-Mg co-doped anatase thin film has high potential as an ETL for perovskite solar cells.</p></div>","PeriodicalId":428,"journal":{"name":"Solar Energy","volume":null,"pages":null},"PeriodicalIF":6.0000,"publicationDate":"2024-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Al-Mg co-doped TiO2 thin film as a promising ETL for perovskite solar cells: An experimental and DFT investigation\",\"authors\":\"Ariful Islam , Raisa Tahiyah , Md. Ruman Sheikh , Muhtasim Al Muyeed Jim , Md. 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UV–vis spectroscopy data show that optical bandgap increases with Al-Mg co-doping, leading to the highest bandgap for Ti<sub>0.87</sub>Mg<sub>0.1</sub>Al<sub>0.03</sub>O<sub>2,</sub> which also has the highest transmittance peak, reaching 90 % in the visible region. Urbach energies are also calculated to get a better estimate of the effective bandgaps. Band edge positions are calculated using Mulliken’s electronegativity, demonstrating improved band alignment due to Al-Mg co-doping. The bandgap trend is further corroborated with DFT + U simulations, which show that calculated bandgaps match the experimentally obtained optical bandgaps. Additionally, density of states reveal that Ti 3d orbital dominates the conduction band and O 2p orbital dominates the valence band, with hybridization taking place between different orbitals. Four-point probe test demonstrates that Al-Mg co-doping leads to a consistent decrease in sheet resistance of the thin film. 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引用次数: 0
摘要
太阳能电池为能源危机提供了潜在的解决方案,而过氧化物太阳能电池则是最新的领跑者。然而,TiO2 ETL 的低导电性是制约其效率的瓶颈。为解决这一问题,本研究采用一步旋涂法制备了铝镁共掺杂锐钛矿薄膜,并对其进行了表征。XRD 结果表明,掺杂会导致晶粒尺寸变小、平面间距减小,但会增加晶格应变和位错密度。原子力显微镜图像显示,铝镁共掺会增加表面粗糙度。共掺杂薄膜的表面形貌良好,均匀地覆盖了整个基底,没有任何针孔。XPS 结果确保实现了所需的成分。紫外-可见光谱数据显示,光带隙随 Al-Mg 共掺量的增加而增大,从而使 Ti0.87Mg0.1Al0.03O2 的带隙最大,透射率峰值也最高,在可见光区域达到 90%。为了更好地估算有效带隙,还计算了乌尔巴赫能量。利用 Mulliken 电负性计算了带边位置,结果表明铝镁共掺杂改善了带的排列。DFT + U 模拟进一步证实了带隙趋势,模拟结果表明计算带隙与实验获得的光带隙相吻合。此外,状态密度显示 Ti 3d 轨道主导导带,O 2p 轨道主导价带,不同轨道之间存在杂化。四点探针测试表明,铝镁共掺会导致薄膜的薄层电阻持续下降。更好的能带排列、更高的可见光透射率以及更强的导电性表明,铝镁共掺杂锐钛矿薄膜很有潜力成为过氧化物太阳能电池的 ETL。
Al-Mg co-doped TiO2 thin film as a promising ETL for perovskite solar cells: An experimental and DFT investigation
Solar cells offer a potential solution to the energy crisis, and perovskite solar cells are the latest frontrunner. However, low electrical conductivity of TiO2 ETL serves as a bottleneck to its efficiency. In this study, Al-Mg co-doped anatase thin films are prepared by one-step spin coating method and then characterized to tackle this problem. XRD results show that doping leads to smaller crystallite size and decreased interplanar spacing, but increases the lattice strain and dislocation density. AFM images reveal that Al-Mg co-doping increases surface roughness. Surface morphology of the co-doped film is good, covering the whole substrate uniformly without any pinholes. XPS results ensure that the desired composition is achieved. UV–vis spectroscopy data show that optical bandgap increases with Al-Mg co-doping, leading to the highest bandgap for Ti0.87Mg0.1Al0.03O2, which also has the highest transmittance peak, reaching 90 % in the visible region. Urbach energies are also calculated to get a better estimate of the effective bandgaps. Band edge positions are calculated using Mulliken’s electronegativity, demonstrating improved band alignment due to Al-Mg co-doping. The bandgap trend is further corroborated with DFT + U simulations, which show that calculated bandgaps match the experimentally obtained optical bandgaps. Additionally, density of states reveal that Ti 3d orbital dominates the conduction band and O 2p orbital dominates the valence band, with hybridization taking place between different orbitals. Four-point probe test demonstrates that Al-Mg co-doping leads to a consistent decrease in sheet resistance of the thin film. Better band alignment and higher visible light transmittance combined with enhanced conductivity indicate that Al-Mg co-doped anatase thin film has high potential as an ETL for perovskite solar cells.
期刊介绍:
Solar Energy welcomes manuscripts presenting information not previously published in journals on any aspect of solar energy research, development, application, measurement or policy. The term "solar energy" in this context includes the indirect uses such as wind energy and biomass