2D conducting metal oxides offer unprecedented control of thin film electrostaticsat the nanoscale. A scalable, rapid, and low-cost approach ispresented to printing transparent conductive oxides (TCOs) via spontaneouslow-temperature Cabrera-Mott oxidation of compliant liquid metals.Repeating heterostructures of these 2D oxide layers are exploited to producean exceptional, 100× increase in conductivity while simultaneously raisingthe visible range optical transmittance. This innovative approach employsdefect modulation doping at the type I heterojunction between InO_x/GaO_x,exceeding the achievable performance with ITO, which is otherwise limitedby poor dopant activation at low temperatures. The exceptional performanceof these multilayer 2D TCO superlattices exceeds that of competing TCOsprinted from sol-gels and nanoparticles, establishing a 100× faster process tofabricate flexible inorganic electronics.
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