Design and Fabrication of TiO2\G Nanocomposite as Electron Transport Layer for Perovskite QD Solar Cells.

Document Type : Research Paper


Department of Physics, College of Science, University of Thi-Qar, Thi-Qar,64001, Iraq


This work successfully presented a comparison between two solar cell models based on the development of perovskite layer using quantum dots. The systems (FTO \c-TiO2-G\ TiO2-G (ETL)\CH3NH3PbI3\ZrO2-G) and (FTO \c-TiO2-G\ TiO2-G (ETL)\CH3NH3PbI3 QD\ZrO2-G) were prepared. The layers that make up the cell were characterized individually after being deposited on FTO glass substrates. X-ray diffraction, FESEM, TEM, FTIR, and Uv-Vis. spectroscopy techniques were utilized to determine the structural, morphological, topological, and optical properties of these layers respectively. XRD pattern of perovskite CH3NH3PbI3 showed a polycrystalline structure with (211) as a dominate phase and 78.28 nm as crystallite size. In addition, it had multi-plane prismatic structures with 1.38071±0.78847 μm of the length average and 0.34694±0.18069 μm of the diameter average, and about 72.3 % as a porosity, in the same time, its energy gap reduced from 1.95 eV for CH3NH3PbI3 to 1.74 eV for CH3NH3PbI3 QD. At the same time, both fill factor and efficiency increased about 1.39% for FF and 9.55% for efficiency with replacing of CH3NH3PbI3 QD.