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Electric field assisted spray coated lead free bismuth iodide perovskite thin film for solar cell application
摘要： Solution-processed Methylammonium iodo bismuthate (MBI) perovskite solar cell is fabricated by spray technique with changed applied voltages from 0 to 1000 V during the deposition of MBI thin film. The morphology and surface roughness of MBI films are influenced significantly by the electric field during film deposition. It is attributed to improve the atomization of spray droplets due to process of coulomb fission. The surface roughness of MBI film is reduced from 39 to 19 nm with increased applied voltages during the deposition from 0 V and 1000 V, respectively. A strong absorption band is observed ～500 nm for all MBI films. The MBI perovskite solar cell is showed enhancement in the efficiency with the maximum current density 2.33 mA/cm2 at 1000 V applied voltage during the deposition. The improvement in photovoltaic characteristics with applied voltage during the film deposition is attributed to the formation of more uniform film with improved surface morphology and roughness, resulting in efficient electron transfer and reduced recombination of charge carrier at grain boundaries.
关键词： Methyl ammonium bismuth (III) iodide,Spray deposition,Perovskite solar cell,Electric filed,Lead free perovskite
更新于2025-11-21 11:18:25
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Current improvement of substrate structured Sb<sub>2</sub>S<sub>3</sub> solar cells with MoSb<sub>2</sub> interlayer
摘要： Sb2S3 solar cells with substrate structure usually suffer from pretty low JSC, due to its wide bandgap (~1.7 eV) and poor carrier transport. As a one-dimensional material, Sb2S3 exhibits orientation-dependent carrier transport property. Herein, a thin MoSe2 layer is directly synthesized on the Mo substrate followed by the deposition of Sb2S3 thin film. X-Ray Diffraction (XRD) patterns confirm that a thin MoSe2 layer can improve the crystallization of Sb2S3 film and induce (hk1) orientations, which could provide more carrier transport channels. Kelvin probe force microscopy (KPFM) results suggest this modified Sb2S3 film has a benign surface with less defects and dangling bonds. The variation of surface potential of Sb2S3 indicates a much efficient carrier separation. Consequently, the power conversion efficiency (PCE) of substrate structured Sb2S3 thin film solar cell is improved from 1.36% to 1.86%, which is the best efficiency of the substrate structured Sb2S3 thin film solar cell, and JSC significantly increase to 13.6 mA/cm2. According to EQE and C-V measurements, the modified crystallization and elevated built-in electric field are the main causes.
关键词： built-in electric filed,KPFM,Sb2S3 thin film,super thin MoSe2
更新于2025-09-19 17:13:59