Abstract
Planar perovskite solar cells (PPSCs) have received great attention in recent years due to their intriguing properties, which make them a good choice for photovoltaic applications. In this work, the effect of alkali and transition metal-doped TiO2 (cesium-doped TiO2 (Cs-TiO2) and yttrium-doped TiO2 (Y-TiO2)) compact layers on the optical, structural and the photovoltaic performance of the PPSCs have been investigated. The perovskite layer syntheses were carried out by depositing a lead iodide (PbI2) layer via spin-coating; converting PbI2 into methyl ammonium iodide (CH3NH3PbI3) by chemical vapor deposition (CVD) and spin-coating at 60 min and 60 s conversion times respectively. The as-deposited PPSCs were studied layer-by-layer using an X-ray diffractometer, scanning electron microscope, and UV-vis diffuse reflectance, transmittance and absorbance. The power conversion efficiency for stable processed perovskite solar cells were 3.61% and 12.89% for air and vacuum processed, respectively.
Highlights
IntroductionPaper a mesoporous layer improves the perovskite crystallinity, surface morphology and reduce charge recombination.[14,15,16]
Perovskite solar cells (PSCs) have attracted great interest due to their intriguing properties such as large absorption coefficient, high electron–hole diffusion length, tunable band gap, high charge carrier mobility, low temperature processing and low cost of production
Numerous metal oxides have been employed to improve the effectiveness of electron transport materials (ETM) such as titanium oxide (TiO2), aluminum oxide (Al2O3), zinc oxide (ZnO), tin oxide (SnO2), and magnesium oxide (MgO)[17,18,19,20,21] etc
Summary
Paper a mesoporous layer improves the perovskite crystallinity, surface morphology and reduce charge recombination.[14,15,16]. TiO2 has been proven to be the most widely preferred ETM due to its chemical stability, low-cost synthesis and charge transport tendency.[10,22,23] In addition, TiO2 ETM has shown a better conversion efficiency, and this is possible due to the band alignment between the conduction band of the TiO2 ETL and the lower unoccupied molecular orbital (LUMO) perovskite active layer.[24] The electrons generated in the absorber layer can make his way to the ETL with less stress. This research work addresses the issue of choice of deposition method for doped c-TiO2 ETL and the perovskite absorber layer on the PSCs performance
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