High-temperature mobility of puren-type InP epitaxial layers

Abstract
High-purity epitaxial n-type InP thin layers give usually a reduced room-temperature Hall mobility compared to both bulk material and theoretical expectations. This effect occurs despite high low-temperature mobility, and is interpreted as due to a residual deep-donor center which acts as a strong scatterer and provides the additional electronic excitation observed at high T. A binding energy of 160 meV is found to be consistent with both the free-electron concentration and the computed Hall mobility.