Semiconductor physics
Which value is closest to the band gap of germanium (Ge) at room temperature?
- AAbout 0.66 eV
- BAbout 1.42 eV
- CAbout 1.12 eV
Show answer and explanation
Answer: A. About 0.66 eV
The band gap of germanium is about 0.66 eV at room temperature, smaller than that of silicon (about 1.12 eV). Because of the small band gap, its intrinsic carrier density is high and leakage current tends to increase at high temperatures. About 1.42 eV is the value for GaAs.
- A. Correct. Ge has a smaller band gap than silicon.
- B. About 1.42 eV is the value for GaAs (gallium arsenide).
- C. About 1.12 eV is the value for silicon.