Ge1-xSnx/Ge1-ySny(001)의 band lineup 유형

Abstract

We present the band lineups of G <TEX>$e_{1-}$</TEX>x S <TEX>$n_{x}$</TEX> G <TEX>$e_{1-}$</TEX>y S <TEX>$n_{y(001)}$</TEX> heterostructures for the new devices. The energy gap of the bulk G <TEX>$e_{1-}$</TEX>x S <TEX>$n_{x}$</TEX> alloy is calculated by taking into account the Vegard's law. The change of the energy gap due to the strain is understood in terms of the deformation Potential theory The valence band offset is obtained from the average bond energy model, where the changes of the band offset due to alloy compositions and strain are included. It is found that Ge/G <TEX>$e_{1-}$</TEX>y S <TEX>$n_{y(001)}$</TEX> heterostructure has a staggered lineup type for 0<x<TEX>$\leq$</TEX>0.06 and a straddling one for 0.06<x<TEX>$\leq$</TEX>0.26. Meanwhile, Ge/G <TEX>$e_{l-y}$</TEX> S <TEX>$n_{y(001)}$</TEX> heterostructure has a staggered lineup type for 0<y<TEX>$\leq$</TEX>0.19 and a broken-gap one for 0.19<y<TEX>$\leq$</TEX>0.26. As a result, the various type of the G <TEX>$e_{1-}$</TEX>x S <TEX>$n_{x}$</TEX> G <TEX>$e_{1-}$</TEX>y S <TEX>$n_{y(001)}$</TEX> heterostructure can be applied for the useful device.evice.