MORPHOLOGY CONTROL OF THIN FILM PEROVSKITE MAPbI3 AS AN ACTIVE LAYER OF SOLAR CELL

• Main Author: ROSSA PRATIWI (NIM: 20215038), ZENIAR
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/24857
• Institution: Institut Teknologi Bandung

The need of energy is an important part that support the life. However, increasing the need of energy are incomparable with the existence of conventional energy sources such as fossils. In so far, fossils is the source of energy that is most widely used. In addition, the air pollution problem and global warming leading to find renewable source energy as one of alternative solution. The use of renewable energy is that as it is renewable it is therefore sustainable and so will never run out. Solar energy with its abundance has a great potential to be one of the sources of renewable energy. One of the use of solar energy is involved the photovoltaic phenomenon in solar cells devices. Perovskites is the materials that has a potential to be an active layer for solar cells due to its ability of extracting charge carriers when devices illuminated. One type of perovskite that usually used is an organic-inorganic hybrid perovskites. Organic-inorganic perovskite solar cells with planar structure configuration produced by one step deposition technique has great potential to be simply and easy fabrication. However, active layer as absorber layer in solar cells device produced by this method still shows rough and inhomogen surface morphology with the formation of islands in suface film above the FTO/TiO2. Resulting poor coverage of the film and thus affect the solar cells performance. In this research, control has been performed to improve the morphology of MAPbI3 active layer by flowing heat-air during perovskite solution spin coating which allows for the fabrication of simple reproducible reduce pin-hole of MAPbI3 perovskite thin films via one-step method. Heat-airflow druing spin coating leads to fast evaporation of the solvent DMF in a shorter time. The morphology of the layers is controlled by varrying the heat flow rate at 1,5 m/s, 1,7 m/s, 2 m/s and without heat flow (conventional). Optical microscope show that the heat-airflow is able to induce the nucleation process of the film in which the initial nucleus grows more homogeneous. SEM image characterization shows the morphological structure of the film. The heat-airflow during spin coating process have homogeneously distributed grains. The higher the flow rate, the higher surface coverage of the resulting film. This will be related to the absorbance of the film. Based on the absorbance curve obtained by UV-Vis characterization shows that the presence of heat-airflow can improve the ability to absorb. The higher the flow rate, the higher the absorbance. Crystal structure of the film obtained by using a 2 m/s heat-airflow rate and XRD characterization was performed. From the XRD curve show that the obtained film has a tetragonal crystal structure. As a result, the solar cell device is fabricated using a deposition-activated layer using a heat-airflow at a rate of 2 m/s. The I-V characteristics of the solar cell device yielded an efficiency of 0,94% with Voc 0,43 V; Isc 0,96 mA; And FF 0,31.