Channel-Length Dependent Performance Degradation of Thermally Stressed IGZO TFTs
Notice bibliographique
Résumé
The focus of this work is on the performance degradation of thermally stressed IGZO TFTs with SiO 2 for both the gate dielectric and back-channel passivation material. The TFT fabrication process included a post-passivation 400 °C O 2 anneal to adjust the IGZO semiconductor properties. I-V characteristics of TFTs with bottom-gate (BG) and double-gate (DG) electrode configurations were observed to left-shift and degrade with 200 °C hotplate treatments as shown in Fig. 1. The mechanism causing the instability is not completely understood, however experimental results indicate the instability occurs either directly or indirectly due to the influence of H 2 O within the passivation oxide above the IGZO channel region. The instability of DG devices was consistently more pronounced, suggesting a reaction between H 2 O and the aluminum top-gate electrode resulting in the liberation of monatomic hydrogen. This interpretation is supported by complementary experiments on MOS capacitors fabricated on bulk silicon substrates. The application of an alumina capping layer deposited by atomic layer deposition (ALD) was successful in improving thermal stability, with representative results shown in Fig. 2. While most BG capped devices remained stable over several successive thermal treatments, DG devices demonstrated the onset of degradation with noted variation in both the time required and occurrence frequency. The analysis revealed an unanticipated dependence on channel length, with long-channel devices (L = 48 µm) being much more prone to an early onset of degradation compared to shorter devices (L = 12 µm) as shown in Fig. 2. With H 2 O remaining as the expected origin of thermal instability, a hypothesis has been developed to explain the observed channel length dependence. The results are consistent with the molybdenum source/drain contact regions acting as gettering sites for H 2 O molecules during the 400 °C annealing process. The removal of H 2 O from the back-channel region is a two dimensional process limited by the diffusivity of water, with the process more complete in short channel devices. Remaining H 2 O molecules at or near the back-channel interface in long-channel devices are able to migrate during thermal stress treatments, establishing complete coverage on devices that experience degradation. Experiments which explore the addition of getter features on or adjacent to the back-channel region, as illustrated in Fig. 3, in addition to localized materials analysis techniques such as secondary ion mass spectroscopy (SIMS) will provide additional evidence either in support or denial of the proposed hypothesis. Figure 1
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Prédiction distillée sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule tête enseignante, pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».