Investigation of Interface States, Series Resistance and Barrier Height Variation with Frequency in Al/WO3/p-Si (MOS) Capacitors

Year 2024, Volume: 14 Issue: 4, 1538 - 1549, 01.12.2024

Ramazan Lök

https://doi.org/10.21597/jist.1529537

Abstract

In the study, Tungsten oxide (WO3) was synthesized via the sol-gel method on P-type 〈100〉 silicon wafer. Electrical characterization of the Al/WO3/p-Si (MOS) capacitor was performed through capacitance-voltage (C-V) and conductance-voltage (G/ω-V) measurements at different frequencies (from 50 kHz to 1 MHz). As the applied voltage frequency increased, the maximum values of the measured C-V and G/ω-V characteristics decreased. This phenomenon was attributed to interface state trap (Dit) charges following low-frequency AC voltage signals. The variation of series resistance (Rs) and barrier height (ΦB) with frequency was examined. It was shown that Rs significantly affects the device behaviour. The ΦB also decreased with increasing frequency. This situation is suggested to indirectly affect the mobility of charge carriers directly through the Vo value. Ultimately, although WO3 material exhibits variable results in terms of dielectric properties, the study's finding of a high dielectric constant (e.g., 3688.75) is consistent with similar results in the literature. This high dielectric property underscores the material's importance for future applications.

Keywords

High K, MOS, WO3, Barrier Height, Series Resistance Effects

Supporting Institution

Türkiye Cumhurbaşkanlığı, Strateji ve Bütçe Başkanlığı,

Project Number

2016K12-2834, 2020,

Al/WO3/p-Si (MOS) Kapasitörlerde Arayüzey Durumları, Seri Direnç ve Bariyer Yüksekliğinin Frekansla Değişiminin İncelenmesi

Abstract

Çalışmada, Tungsten oksit (WO3), sol-jel yöntemiyle P-tipi 〈100〉 silisyum plakası üzerinde sentezlenmiştir. Al/WO3/p-Si (MOS) kapasitör elektriksel karakterizasyonu, farklı frekanslarda (50 kHz'den 1 MHz'e kadar) kapasite-voltaj (C-V) ve iletkenlik-voltaj (G/ω-V) ölçümleri ile gerçekleştirilmiştir. Uygulanan voltaj frekansı arttıkça, ölçülen C-V ve G/ω-V karakteristiklerinin maksimum değerleri azalmıştır. Bu olgu, arayüzey durumu tuzak (Dit) yüklerinin düşük frekanslı AC voltaj sinyallerini takip etmesine bağlanmıştır. Seri direnç (Rs) ve bariyer yüksekliğinin (ΦB) frekansla değişimi incelenmiştir. Rs 'in cihaz davranışını önemli ölçüde etkilediği gösterilmiştir. ΦB de artan frekansla azalmıştır. Bu davranışın, V0 değerini doğrudan etkilerken yük taşıyıcılarının hareketliliğini dolaylı olarak etkilediği öne sürülmüştür. Sonuç olarak, WO3 malzemesi dielektrik özellikler açısından değişken sonuçlar sergilemesine rağmen, çalışmanın yüksek dielektrik sabiti (örneğin, 3688.75) bulgusu literatürdeki benzer sonuçlarla tutarlıdır. Bu yüksek dielektrik özelliği, malzemenin gelecekteki uygulamalar için önemini vurgulamaktadır.

Keywords

Yüksek K, MOS, WO3, Bariyer Yüksekliği, Seri Direnç Etkisi

Project Number

2016K12-2834, 2020,

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