Ngqoloda, SipheloNwankwo, U.Nkele, Agnes Chinecherem2020-12-152020-12-15202019. Ngqoloda, S. et al. (2020). 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. RSC Advances,10(22),13139-131482046-206910.1039/d0ra01532fhttp://hdl.handle.net/10566/5511Planar 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.enAlkaliTiO2Perovskite solar cellsElectron transport layerHole transport layerArticle