Abstract
One of the important technology for semiconducting materials is to grow high purity and perfect crystals. Therefore, defect control in the materials is a key technology for realizing modern electronics, The basic research on defects is developing as electronic device technology is progressing. On the other hand, for a long time organic crystals (except polymer) have not been studied as technological materials, Crystal growth and defect properties of these crystals attracted the attention of few researchers. Recently, the reserach of crystal growth in organic crystals is becoming increasingly important to the field of application from optical devices to biological materials. Therefore, this article deals with basic properties of structual defects in organic crystals. Moreover, crystal growth and defect control in organic crystals are discussed. We exclude polymer crystals (except PTS polymer crystals) since large single crystals with high perfection have not been obtained.
