Inserting Interfacial Layer for Atomic-Scaled Hydrogen Control to Enhance Electrical Properties of InZnO TFTs

Cho, Seong‐In; Woo, Namgyu; Jeong, Hyun‐Jun; Park, Sang‐Hee Ko

doi:10.1109/led.2023.3250439

Cited by 5 publications

(1 citation statement)

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“…Eventually, shallow-donor states are generated in the OS, which increases the free electron density and makes the V th shift toward negative values (ΔV th < 0 V). [14,[18][19][20][21] If both phenomena are present, competition occurs between charge trapping and free carrier generation in a device under PBTS.…”

Section: Introductionmentioning

confidence: 99%

Reliability Engineering of High‐Mobility IGZO Transistors via Gate Insulator Heterostructures Grown by Atomic Layer Deposition

Kim,

Hwang,

et al. 2024

Adv Materials Inter

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The reliability of oxide‐semiconductor (OS) thin‐film transistors (TFTs) is significantly influenced by the gate insulator (GI). During electrical bias stress, the defect sites near the semiconductor/GI interface and/or within the GI may trap electrons, which makes the threshold voltage (Vth) shift toward positive values. On the other hand, carbon (C) or hydrogen (H) atoms may diffuse from the GI into the active layer, and act as shallow donors, which induce negative Vth shifts (ΔVth). In this paper, an in situ atomic layer deposition (ALD)‐based GI heterostructure is introduced, which consists of a stack of two complementary materials, namely Al2O3 and SiO2. Here, a competition occurs between electron trapping in Al2O3 (positive ΔVth) and carrier generation from H atoms in SiO2 (negative ΔVth) which allows the achievement of nearly zero ΔVth under positive bias temperature stress (PBTS). This strategy is successfully applied to a high‐mobility (>50 cm2 Vs−1) ALD‐based indium‐gallium‐zinc oxide (IGZO) device, resulting in a net ∆Vth of −0.02 V under PBTS and drain current variation (∆ID) of +0.49% under constant current stress (CCS). The application of an in situ ALD process thus offers valuable insights to resolve the mobility versus reliability trade‐off in high‐performance oxide TFTs.

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Section: Introductionmentioning

confidence: 99%