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An effective approach to reduce defects and increase electron mobility in a‐IGZO thin‐film transistors (a‐IGZO TFTs) is introduced. A strong reduction layer, calcium, is capped onto the back interface of a‐IGZO TFT. After calcium capping, the effective electron mobility of a‐IGZO TFT increases from 12 cm2 V−1 s−1 to 160 cm2 V−1 s−1. This high mobility is a new record, which implies that the proposed...
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