Synthesis and Characterization of High-Efficiency Halide Perovskite Nanomaterials for Light-Absorbing Applications

Abstract

Inorganic perovskite materials are possible candidates for conversion of solar energy to electrical energy due to their high absorption coefficient. Perovskite solar cells (PSCs) introduced a new type of device structure that has attention due to better efficiencies and interest in PSCs that has been increasing in recent years. Halide perovskite materials such as CsPbIBr2 show remarkable optical and structural performance with their better physical properties. Perovskite solar cells are a possible candidate to replace conventional silicon solar panels. In the present study, CsPbIBr2 perovskite materials’ thin films were prepared for light-absorbing application. Five thin films were deposited on the glass substrates by subsequent spin-coating of CsI and PbBr2 solutions, subsequently annealed at different temperature values (as-deposited, 100, 150, 200 and 250 °C) to get CsPbIBr2 thin films with a better crystal structure. Structural characterizations were made by using X-ray diffraction. CsPbIBr2 thin films were found to be polycrystalline in nature. With increasing annealing temperature, the crystallinity was improved, and the crystalline size was increased. Optical properties were studied by using transmission data, and by increasing annealing temperature, a small variation in optical band gap energy was observed in the range of 1.70–1.83 eV. The conductivity of CsPbIBr2 thin films was determined by a hot probe technique and was found to have little fluctuating response toward p-type conductivity, which may be due to intrinsic defects or presence of CsI phase, but a stable intrinsic nature was observed. The obtained physical properties of CsPbIBr2 thin films suggest them as a suitable candidate as a light-harvesting layer. These thin films could be an especially good partner with Si or other lower band gap energy materials in tandem solar cells (TSC). CsPbIBr2 material will harvest light having energy of ∼1.7 eV or higher, while a lower energy part of the solar spectrum will be absorbed in the partner part of the TSC.

Toward Efficient Bactericidal and Dye Degradation Performance of Strontium- and Starch-Doped Fe2O3 Nanostructures: In Silico Molecular Docking Studies

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Effect of copper doping on plasmonic nanofilms for high performance photovoltaic energy applications

“…The Scherrer formula as presented in eqn (1) 39 was used to predict the size of the crystallite ( D ). 40 Where D , λ , θ , β and k represent the crystallite size, wavelength, diffraction angle, half-value width, and Scherrer constant (0.9), respectively. To calculate other structural parameters including the microstrain ( ε ) and dislocation density ( δ ) utilizing Williamson and Smallman's (WS) method, eqn (2) and (3) are used, respectively.…”

Fourth-generation solar cells: a review

“…Perovskites exhibit an exceptional ability to absorb light because they transport the electric charge when light falls on them, resulting in an increase in electron mobility. 126 Due to their long-range ambipolar charge transport, 12 high dielectric constant, high absorption coefficient, 127 low exciton-binding energy, 128 ferroelectric characteristics, 129,130 and other unique physical properties, perovskite materials have sparked a lot of interest for their use in photovoltaic and optoelectronic devices. Since the efficiency of solar cells based on perovskite materials has risen from an initial 3.8% to more than 25%, research interest in these materials has grown dramatically.…”