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Openai/69174844-9774-8012-8b69-32262ca5e35a
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=== - 本质上,判断“肖特基”还是“欧姆”不是看势垒高度 与否的单一比较,而是看势垒是否能有效限制电流。 === * '''势垒宽度 W(或等价的局域电场 F)'''对是否发生隧穿起决定性作用,因为隧穿概率随 W 指数变化。 * 势垒高度 ΦB 控制热激发越过势垒的概率(TE 的指数),但即便 ΦB 不小,如果 W 极薄,隧穿仍会占优 → 欧姆行为。 * 工程上常用两个可计算判据:(i) 计算 E00E_{00}E00 与 kTkTkT 的比值(经验判据);(ii) 计算耗尽宽度 WWW,若 W≲W\lesssimW≲ 几 nm,则隧穿占主导。
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