Since the early 1970s, semiconductor photoelectrochemistry has been attracting considerable interest in academic—and increasingly in industrial—laboratories for solar energy conversion. This textbook introduces the principles of semiconductor photoelectrochemistry to undergraduate and master-level students, with basic physics and physical chemistry as pre-requisites. Several books exist in the domain, but none presents the field at an introductory, education-oriented level. The book, with its interdisciplinary character, demonstrates how two separately taught fields at universities—electrochemistry and solid-state physics—can be combined for the development of systems for solar energy conversion for electricity generation or preparation of chemicals. It contains detailed mathematical derivations of all related concepts, illustrating the common characteristics of these fields. Appendices are included in the chapters to present the details of several aspects of physical science in support of the fundamentals. A comprehensive bibliography is presented at the end, suggesting several textbooks and reference books complementing the topics covered in the textbook.