Explanatory notes
… DIODES, TRANSISTORS, SEMICONDUCTOR BASED TRANSDUCERS) These are defined in Note 12 (a) (i) to this Chapter. The … (e.g., trivalent and pentavalent elements, such as gallium arsenide, indium antimonide). Semiconductor materials … may be a pentavalent chemical element (phosphorus, arsenic, antimony, etc.) or a trivalent element (boron, …