20 pA

30 pA

40 pA

80 pA

abundance of Silicon on the surface of the Earth.

larger bandgap of Silicon in comparison to Germanium.

favorable properties of Silicon-dioxide (SiO₂)

lower melting point

$$\delta \left( t \right) = \left\{ {\matrix{ 1 & {t = 0} \cr {0\,{\,^,}} & {otherwise} \cr } } \right.$$

$$\delta \left( t \right) = \left\{ {\matrix{ \infty & {t = 0} \cr {0\,\,,} & {otherwise} \cr } } \right.$$

$$\delta \left( t \right) = \left\{ {\matrix{ 1 & {t = 0} \cr {0\,\,,} & {otherwise} \cr } } \right.$$ and $$\int\limits_{ - \infty }^\infty {\delta \left( t \right)\,dt = 1} $$

$$\delta \left( t \right) = \left\{ {\matrix{ \infty & {t = 0} \cr {0\,\,,} & {otherwise} \cr } } \right.$$ and $$\int\limits_{ - \infty }^\infty {\delta \left( t \right)\,dt = 1} $$

$${\mathop{\rm Re}\nolimits} \left( s \right) > a + 2$$

$${\mathop{\rm Re}\nolimits} \left( s \right) > a + 7$$

$${\mathop{\rm Re}\nolimits} \left( s \right) < 2$$

$${\mathop{\rm Re}\nolimits} \left( s \right) > a + 5$$