Transparent, high-strength, stretchable, sensitive and anti-freezing poly(vinyl alcohol) ionic hydrogel sensors were facilely fabricated for human motion monitoring.
Zinc oxide (ZnO)
thin-film transistors (TFTs) have many promising
applications in the areas of logic circuits, displays, ultraviolet
detectors, and biosensors due to their high performances, facile fabrication
processing, and low cost. The solution method is an important technique
for low-cost and large fabrication of oxide semiconductor TFTs. However,
a key challenge of solution-processable ZnO TFTs is the relatively
high processing temperature (≥500 °C) for achieving high
carrier mobility. Here, facile, low-cost, and solution-processable
ZnO TFTs were fabricated under the annealing temperature of ≤300
°C. Dense and polycrystalline ZnO films were deposited by the
spin-coating method. The ZnO TFTs showed the maximum electron mobility
of 11 cm
2
/V s and a high on/off ratio of >10
7
when the ZnO thin films were annealed at 300 °C. The mobility
was extremely high among solution-processable undoped ZnO TFTs reported
previously, even better than some high-cost indium-doped ZnO TFTs
fabricated at low temperature. Furthermore, it is found that the mechanism
of oxygen vacancies dominates the electron transport in ZnO thin film
and interface behaviors of ZnO thin film and SiO
2
gate
insulator, and then dominates the performances of devices.
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