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Blue sensitive sub-band gap negative photoconductance in SnO 2 /TiO 2 NP bilayer oxide transistor.

Nanoscale 2024 April 9
Large negative photoconductance (NPC) of SnO2 /TiO2 nanoparticles (NPs) heterostructure has been observed with thin film transistor (TFT) geometry and has been investigated using sub-bandgap light (blue) illumination. This negative photoconduction has been detected both in accumulation and depletion mode operation, which effectively reduces the carrier mobility ( μ ) of the TFT. Moreover, the threshold voltage ( V th ) widely shifted in the positive direction under illumination. The combined effects of the reduction of mobility and V th shifting led to a faster reduction of On (or Off) state current under illumination. The negative photosensitivity of this system is as high as 3.2 A W-1 , which has been rarely reported in the earlier literature. Moreover, the variation of On (or Off) current, μ and V th shift is linear with low-intensity blue light. This SnO2 /TiO2  NP bilayer channel has been deposited on top of an ionic dielectric (Li-Al2 O3 ) that reduces its operating voltage of this TFT within 2 V. Furthermore, the device has achieved a saturation mobility of 0.4 cm2 V-1 s-1 with an on/off ratio of 7.4 × 103 in the dark. An energy band diagram model has been proposed based on the type-II heterostructure formation between SnO2 /TiO2 semiconductors to explain this NPC mechanism. According to the energy band diagram model, adsorbed H2 O molecules of TiO2 NPs created a depleted layer in the heterostructure that accelerated the recombination process of photo-generated carriers rather than its transport.

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