Effects of alkali and transition metal-doped TiO2 hole blocking layers on the perovskite solar cells obtained by a two-step sequential deposition method in air and under vacuum. Issue 22 (1st April 2020)

• Record Type: Journal Article
• Authors: Nwankwo, U.; Ngqoloda, Siphelo; Nkele, Agnes C.; Arendse, Christopher J.; Ozoemena, Kenneth I.; Ekwealor, A. B. C.; Jose, Rajan; Maaza, Malik; Ezema, Fabian I.
• Is Part Of: RSC advances. Volume 10:Issue 22(2020)
• Page Start: 13139
• Page End: 13148
• Publication Date: 2020-04-01
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/d0ra01532f
• Languages: English
• ISSNs: 2046-2069

Abstract

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. 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 (CH3 NH3 PbI3 ) 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.