ZnO Nanorods with Tunable Aspect Ratios Deriving from Oriented-attachment for Enhanced Performance in Quantum-dot Sensitized Solar Cells

摘要: Abstract ZnO nanorods consisted of oriented aligned elongated-nanoparticles along the [0001] direction were readily prepared with tunable aspect ratios by a facile solvothermal method. An oriented-attachment growth mechanism was proposed based on time-dependent trails and first principle density function theory calculation. Control experiments indicated that reaction medium played important roles to influence process ratio could be tuned from ∼4.6 ∼16.0 simply altering precursor dosages. The as-prepared applied as photoanode materials in quantum-dot sensitized solar cells. large pore size film structure rough surface nanorod enhance quantum dots loading amounts light scattering effect. In addition, orderly primary ENPs minimized grain boundaries for suppressed recombination provided direct pathway increased electron diffusion length. Meanwhile, enhanced hydrophilicity facilitated electrolyte penetration regeneration oxidized sensitizers. Therefore, high power conversion efficiency ∼4.83% demonstrated, indicating substantial improvement compared traditional nanoparticle device (∼3.54%).