Publications by authors named "Giorgos Papadimitropoulos"
Article Synopsis
- TiO exhibits high chemical stability and strong catalytic properties, making it a valuable electron transport material in organic solar cells, but its efficiency is hampered by defect-related trap states.
- Doping TiO with nitrogen (p-type) can enhance its photocatalytic efficiency under visible light, while hydrogen doping (n-type) increases electron conductivity; both types of doping can improve performance in solar applications.
- Experimental results show that using hydrogen-doping and nitrogen/hydrogen codoping significantly boosts the maximum power conversion efficiency of organic photovoltaic devices, reaching up to 6.58%, compared to lower efficiencies for as-deposited and solely nitrogen-doped TiO.
Transition-metal-oxide hybrids composed of high surface-to-volume ratio Ta2O5 matrices and a molecular analogue of transition metal oxides, tungsten polyoxometalates ([PW12O40](3-)), are introduced herein as a charge storage medium in molecular nonvolatile capacitive memory cells. The polyoxometalate molecules are electrostatically self-assembled on a low-dimensional Ta2O5 matrix, functionalized with an aminosilane molecule with primary amines as the anchoring moiety. The charge trapping sites are located onto the metal framework of the electron-accepting molecular entities as well as on the molecule/oxide interfaces which can immobilize negatively charged mobile oxygen vacancies.
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- Molybdenum oxide is utilized as a low-resistance layer in devices like OLEDs and solar cells, but its electronic properties and how they relate to its composition are not well understood.
- This study explores how adding hydrogen into the oxide structure and creating oxygen vacancies can enhance the electronic characteristics of molybdenum oxides while preserving their high work function.
- The results show that using hydrogenated molybdenum oxides significantly improves the performance of polymer light-emitting devices and solar cells by optimizing energy levels and increasing charge transport efficiency.