Silicon Heterojunction Solar Cells The world of today must face up to two contradictory energy problems: on the one hand there is the sharply growing consumer demand in countries such as China and India. On the other hand natural resources are dwindling. Moreover many of those countries which still possess substantial gas and oil supplies are politically unstable. As a result renewable natural energy sources have received great attention. Among these solar cell technology is one of the most promising candidates. However there still remains the problem of the manufacturing costs of such cells. Many attempts have been made to reduce the production costs of conventional solar cells (manufactured from monocrystalline silicon using diffusion methods) by instead using cheaper grades of silicon and simpler pn junction fabrication. That is the ‘hero’ of this book; the heterojunction solar cell. The book is aimed at two disparate groups of readers. Firstly it is aimed at researchers and developers in communication and power electronics who already have a good working knowledge of the field of semiconductors. This concise account has been devised precisely to meet the demands of fast paced technologies such as these. Secondly it also satisfies the requirements of students and any other beginners in photovoltaics in that it provides an overview of the current state of the art. Attempts have been made to reduce the cost of manufacturing solar cells by replacing conventional cells made with mono crystalline silicon and diffusion with hetero junction cells made using cheap starting silicon and pn junction fabrication. Fahrner M. Muehlbauer and H.C. Neitzert (not further identified) review the physics use and layer sequence of such cells then assemble condensed articles—one page each— published between 1975 and 2005 on five different varieties of them.