| Efficiency enhancement of perovskite solar cell via the morphology and crystallinity improvements of CH3NH3PbI3 layer |
| Paper ID : 1202-UFGNSM-FULL |
| Authors: |
|
Maryam Alidaei *1, Morteza Izadifard2, Mohammad Ebrahim Ghazi2, Vahid Ahmadi3 1No10, Boostan9st Alley, Boostan St, Bahar Blvd, Hakimieh, Tehran, Iran 2Department of Physics, Shahrood University of Technology, Shahrood, Iran 3Faculty of Electrical and Computer Engineering, Tarbiat Modares University, Tehran, Iran |
| Abstract: |
| Perovskite solar cells have been heavily investigated because of their unique properties such as high power conversion efficiency (PCE), low cost, fabrication by solution process, high diffusion length, large absorption coefficient, and direct and tunable bandgap. The PCE of these devices from 9% reached up to 21% over 5 years. The PCEs of perovskite devices are strongly dependent on the absorber layer properties especially its morphology, crystallinity and compactness, that needs to be optimized. In this work, perovskite solar cells with FTO (500nm)/C-TiO2(50 nm), Meso-TiO2 (300nm), CH3NH3PbI3 (200-300nm), P3HT (30 nm)/ Au (100 nm) structure were fabricated. Two-step solution process was used for perovskite deposition. By controlling the grain size and grain boundaries via optimized concentrations of precursor solutions (MAI in IPA), the device PCE increased. The grain size, uniformity and crystallinity of perovskite layers were investigated by SEM and XRD. The perovskite layer absorbance was obtained by UV-Vis spectroscopy. The obtained XRD patterns showed that in sample prepared by high concentration of precursor solutions, there was no PbI2 peaks and pure perovskite structure (CH3NH3PbI3) was formed. By controlling the deposition condition and achieving larger grain sizes and compact grains, photocurrent enhancement for samples were observed. This may cause the reduction of charge recombination due to the lower grain boundaries. |
| Keywords: |
| Perovskite solar cell, morphology, crystallinity ,two-step solution process technique |
| Status : Paper Accepted (Poster Presentation) |
