1 research outputs found
Phase Control of Organometal Halide Perovskites for Development of Highly Efficient Solar Cells
To develop a highly efficient solar cell using organometal
halide
perovskites, its microscale structure control is one of the most important
factors because the microstructural defects inside the organometal
halide perovskite are harmful to charge carrier flow and, thus, degrade
device performance. In this study, we confirmed the existence of large
physical gaps at the grain boundary in a methylammonium iodide (MAPbI3, MA = CH3NH3) perovskite with transmission
electron microscopy (TEM) analysis and revealed that the physical
gap prevents charge carrier flow in the MAPbI3 perovskite.
To minimize the physical gap and its negative influences, the grain
size of the MAPbI3 perovskite was optimized by increasing
the portion of the cubic phase via microstructural phase control using
liquid nitrogen (LN2). Through microstructural phase control
of the MAPbI3 perovskite, its grain boundaries and physical
gap were significantly decreased, and 20.23% power conversion efficiency
(PCE) was achieved with a single cation MAPbI3 perovskite
solar cell