In recent years a major effort has been put into achieving integration of functional materials into semiconductor technology. Among functional materials ferroelectrics are an important class of materials, exhibiting a large spectrum of properties and effects including the piezoelectric effect, pyroelectric effect, electro-optic effect, spontaneous polarization, etc. Ferroelectrics are attractive for many applications, the most important being ferroelectric non-volatile random access memories (FERAMs) and micro-electromechanical mechanical system (MEMS) devices. For these specific applications, but also desirable for most other envisaged applications of ferroelectric materials, direct integration of ferroelectrics with silicon or other semiconductors of technological potential would be highly desirable. Beside the memory effect, the photoelectric and pyroelectric effects in ferroelectricsemiconductor heterostructures [1,2] could be promising for developing new types of integrated detectors.