Thin‐Film III–V Single Junction and Multijunction Solar Cells and Their Integration onto Heterogeneous Substrates

This chapter reviews the recent progress of thin-film III–V semiconductor- based PV technologies, specifically III–V solar cells integrated with flexible substrates. First, we discuss single junction and MJ III–V solar cells, and their operational principles for energy conversion and experimental process. Second, fabrication schemes and concepts to epitaxially release these thin-film solar cells and integrate them with flexible platforms are overviewed, and their applications in various areas, e.g. energy production, aerospace, sensing, and healthcare, are also discussed. Finally, we present strategies to further improve solar cell performance by developing advanced device and system architectures. To summarize, these thin-film flexible III–V solar cells and systems offer viable routes for energy supply in many emerging applications.