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Promotion of Processability in a p-Type Thin-Film Transistor Using a Se-Te Alloying Channel Layer.
ACS Applied Materials & Interfaces 2024 April 27
p-type thin-film transistors (pTFTs) have proven to be a significant impediment to advancing electronics beyond traditional Si-based technology. A recent study suggests that a thin and highly crystalline Te layer shows promise as a channel for high-performance pTFTs. However, achieving this still requires specific conditions, such as a cryogenic growth temperature and an extremely thin channel thickness on the order of a few nanometers. These conditions critically limit the practical feasibility of the fabrication process. Here, we report a high-performance pTFT incorporating a 60-nm-thick highly crystalline Se-Te alloyed channel layer, produced using pulsed laser ablation at room temperature. The Se0.5 Te0.5 alloy system enhances crystalline temperature and widens the band gap compared to a pure Te channel. Consequently, this approach results in a field-effect mobility of 3 cm2 /V·s, with an on/off current ratio of 3 × 105 , a subthreshold slope of 2.1 V/decade, and a turn-on voltage of 6.5 V, achieved through conventional annealing at 250 °C. To demonstrate its applicability in complementary circuit applications, we integrate a complementary-type inverter using a p-type Se0.5 Te0.5 TFT and an n-type Al-doped InZnSnO, demonstrating a high voltage gain of 12 and a low static power consumption of 17 nW. This suggests that the Se-Te alloyed channel approach paves the way to a more straightforward and cost-effective process for Te-based pTFT devices and their applications.
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