Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Excellent

This is an excellent treatise on the theory of semiconductors which is essential in learning solid-state devices like basic pn junctions and MOS devices. This book lays the fundamentals needed for a good understanding of these devices. Very useful for advanced undergrads and grads. This may be used as a companion volume with Streetman & Banerjee. However all the books of this 'Purdue' series is excellent - they are concise, clear and advanced.