| 초록 |
Molybdenum dioxide (MoO2) is getting tremendous attractions as inorganic hole transporting materials for perovskite solar cells due to its unusual metallic electrical conductivity associated with its mixed interatomic bonding and relatively high-density states at the Fermi level. To date, various synthetic approaches such as electrochemical deposition, combustion synthesis have been proposed to obtain high surface area MoO2 nanoparticles. Among them, solvothermal reaction is important technique to synthesize uniform and pure inorganic nanomaterials. Using this method, we achieved ~20nm size MoO2 nanoparticles from large MoO3 microparticles with irregular shape and size. Under the solvothermal condition, MoO3 microparticles would be disassembled to crystal grains along the crystal grain boundary by thermal expansion and further shattered into small MoO2 nanoparticles by volume shrinkage when the MoO3 are reduced into MoO2 phase. |
