2.1 Introduction2.2 Potential barrier2.3 Energy-band theory2.4 Classification of materials2.5 Intrinsic and extrinsic semiconductors2.6 p- and n-type semiconductor materials2.7 Mobility and conductivity2.8 Properties of semiconductor materials2.9 Hall effect and its applications2.10 Thermistor and sensistor2.11 Time variation of excited minority carriers2.12 Concept of diffusion current2.13 Continuity equation in semiconductors2.14 Injected minority carriers2.15 Graded semiconductor junctionSummarySolved problemsExercise problemsReview questions