CHARACTERISTICS OF PEROVSKITE SOLAR CELLS RELATED TO THE PRESENCE OF CRYSTAL DEFECTS

• Main Author: Fadli Alifvian, Mohammad
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/77897
• Institution: Institut Teknologi Bandung

Perovskite solar cells are third-generation solar cells that are fabricated using perovskite crystals as the active light-absorbing layer. The efficiency and performance of perovskite solar cells are dependent by the characteristics of its constituent layers. The formation of defects in high density on the surface of the perovskite layer is one of the factors that can reduce cell efficiency. Defect passivation method is one of the methods that can be done to reduce the density of surface defects on the perovskite layer. In this research, the defect passivation method is carried out by adding a defect passivation agent, trifluoroacetic acid (TFA), to the methyl ammonium lead iodide (MAPbI3) perovskite layer. This TFA was added into the MAPbI3 precursor solution. The addition of TFA to the MAPbI3 perovskite layer can reduce the number of surface defects that are formed at the grain boundary, which are characterized by an increase in the ???????????? from 0.78 V to 0.86 V, changes in the free charge kinetics process such as a decrease in the charge transfer resistance parameter from 196,10 ? to 65,89 ? and slowing down the ion migration characteristic time from 1,55 s to 11,83 s under light illumination conditions, as well as increasing the electron lifetime from 6,338 ?s to 12,642 ?s at the ???????????? voltage point of 0,61 V. With the reduction in the number of surface defects, the efficiency of the fabricated MAPbI3 perovskite solar cell can increase from 6,011 % to 8,54%.