The present disclosure provides a semiconductor heterojunction. The semiconductor heterojunction includes a bottom semiconductor, a top semiconductor and an electrode substrate. An upper surface of the bottom semiconductor includes a first crystal plane. A bottom surface of the top semiconductor includes a second crystal plane. The bottom surface of the top semiconductor is contacted with the upper surface of the bottom semiconductor. The electrode substrate is disposed below the bottom semiconductor. Thus, the electrical contact is performed by different combinations of the crystal planes between two different semiconductors to observe the characteristics related to the crystal planes, and it is applied to electronic or optical devices. |