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Reference.org
Surface-barrier transistor
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<p>The surface-barrier transistor is a type of <a href="/facts/Transistor/Bmr8zwL0">transistor</a> developed by <a href="/facts/Philco/uJs9yv81">Philco</a> in 1953 as an improvement to the <a href="/facts/Alloy-junction_transistor/oFlgc0ku">alloy-junction transistor</a> and the earlier <a href="/facts/Point-contact_transistor/29Qgz5RC">point-contact transistor</a>. Like the modern <a href="/facts/Schottky_transistor/w8tjjAlJ">Schottky transistor</a>, it offered much higher speed than earlier transistors and used <a href="/facts/Metal%E2%80%93semiconductor_junction/kkjXTjfP">metal–semiconductor junctions</a> (instead of <a href="/facts/P-n_junction/CaKIdLPg">semiconductor–semiconductor junctions</a>), but unlike the Schottky transistor, both junctions were metal–semiconductor junctions. </p>