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

• Main Authors: Nwankwo, U., Ngqoloda, Siphelo, Nkele, Agnes C., Arendse, Christopher J., Ozoemena, Kenneth I., Ekwealor, A. B. C., Rajan, Jose, Maaza, Malik, Ezema, Fabian I.
• Format: Article
• Language: English
• Published: Royal Society of Chemistry 2020
• Subjects: H Social Sciences (General); T Technology (General)
• Online Access: http://umpir.ump.edu.my/id/eprint/29866/1/8.%20Effects%20of%20alkali%20and%20transition%20metal-doped%20TiO2%C2%A0hole%20blocking%20layers.pdf; http://umpir.ump.edu.my/id/eprint/29866/; https://doi.org/10.1039/D0RA01532F; https://doi.org/10.1039/D0RA01532F

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.