Abstract
We report five orders of magnitude enhancement in the detection of ultra-low intensity UV light using a partitioned mesoporous TiO2. The device shows a responsivity of ∼ 0.1 A/W at the incident intensity of 100 μW cm−2. The responsivity is slightly dropped to ∼0.01 A/W at the ultra-low intensity of 14 μW cm−2. High responsivity of the partitioned structure is attributed to the increment of electron diffusion length due to anisotropic and directional diffusive transport. Results show that the partitioned mesoporous TiO2 behaves as a quasi-one dimensional transport media.
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