1. Lattice constant (A) Kroemer’s Lemma of Proven Ignorance Kroemer’s Lemma of New Technology 6.1A Gunn Effect Heterojunction Lineups

2. Lattice constant (A) Kroemer’s Lemma of Proven Ignorance Kroemer’s Lemma of New Technology 6.1A Gunn Effect Heterojunction Lineups

3. Herb’s Bipolar Transistors The Saga of HBTs

4. Drift Transistors are better!

5. “…the drift transistor, this conceived before its time by a young German theorist at Darmstadt” - James Early

6. Use a Widebandgap Emitter !

7. Initial experiments on Si-Ge alloys !

8. Graded Base makes a better device!

9. IBM SiGe HBT

10. GaInP Is a really good material to use ! Why not put the Collector on top? Use heterojunctions for contacts on Emitter and Base !

11. Modern Embodiments InGaP/GaAs HBTs For cell phones SiGe HBTs for analog, microwave and mm-wave circuits InP HBTs for mm-wave and THz applications (Mark Rodwell)

12. Pathways for Communicating New Technology Ideas Traditional View

13. Pathways for Communicating New Technology Ideas More Realistic View

14. Herb’s Sketches & Explanations (~1980-1990)

15. Herb’s Napkin’s (~1980-1990)

16. Mustard stains

18. Lattice constant (A) Kroemer’s Lemma of Proven Ignorance Kroemer’s Lemma of New Technology 6.1A Gunn Effect Heterojunction Lineups Thanks, Herb !!!