Preferential <111>A Pore Propagation Mechanism in n-InP Anodized in KOH

This paper describes the formation of pores during the anodization of n-InP in aqueous KOH. The pores propagate preferentially along the <111>A crystallographic directions and form truncated tetrahedral domains. A model is presented that explains preferential <111>A pore propagation and the uniform diameters of pores. The model outlines how pores can deviate from the <111>A directions and from their characteristic diameters. It also details the effect of variation of carrier concentration on the dimensions of the porous structures.