FABRICATION OF SOLAR CELLS BASED ON ORGANOMETAL HALIDE PEROVSKITE CRYSTALS AND STUDY OF THE WORK FUNCTION CHARACTERISTICS

• Main Author: DEWINGGIH (NIM: 20213024), TANTI
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/24470
• Institution: Institut Teknologi Bandung

Organometal halide perovskite solar cells have attracted researcher attention in recent years due to the relatively high efficiency is achived in a short period of time since the first time reported. In this thesis is presented results of the study about fabrication of the perovskite layer based MAPbI3 and characteristics of the solar cells. The structure of solar cells consists of FTO/c-TiO2/mp-TiO2/MAPbI3/spiro-OMeTAD/Au, at which c-TiO2 and mp-TiO2 are compact and mesoporous layer of TiO2. The TiO2 layer is useful as scaffold for perovskite crystal as light harvesting and the spiro-OMeTAD layer as hole transport layer. The perovskite thin films are formed by one step precursor deposition (OSPD) and two step sequential deposition (TSSD). The XRD results show that the perovskite layer still contains PbI2, it is mean that all of PbI2 have not conversion yet to MAPbI3. Imperfection of the perovskite crystals are estimated can bring the trap states. Besides that, the perovskite crystals cell can change towards the cell temperature. The result of measurement show that J-V curves significantly change with rising of temperature. That J-V curves were fitted with the space charge limited current (SCLC) model. The change of characteristic is understandable as a consequence that the perovskite crystal structure grows less so the built in potential and the resistivity of layer are decrease. This indicate that the trap states are increase with rising of temperature, so performance of the solar cell is decrease. This situation is appropriate with the results of photocurrent transient measurement. It is show that the photocurrent decays more and more fast of the solar cell which lower performance.