A network communication device has a function as a network facsimile device for carrying out sending and receiving of data via a network. However, bipolar transistors are not available in many CMOS processes. The distance between the first sidewall and the third sidewall decreases with increasing proximity to the top surface of a substrate. The energy band-modifying layer may include at least one non-semiconductor monolayer constrained within a crystal lattice of adjacent base semiconductor portions.