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Scrivener Publishing100 Cummings Center, Suite 541j JBeverly, MA 01915-6106

Publishers at Scrivener Martin Scrivener ( martin@scrivenerpublishing.com) Phillip Carmical ( pcarmical@scrivenerpublishing.com)

Edited by

Monika Freunek Müller

This edition first published 2020 by John Wiley & Sons, Inc., 111 River Street, Hoboken, NJ 07030, USA and Scrivener Publishing LLC, 100 Cummings Center, Suite 541J, Beverly, MA 01915, USA

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Library of Congress Cataloging-in-Publication Data

ISBN 978-1-119-60559-1

Cover image: Top right: GaAs photovoltaic array integrated on a microsystem, placed on top of a US penny. Photo by Inhee Lee and Eun Seong Moon, University of Michigan

Other images provide by the Editor

Cover design by Russell Richardson

Indoor photovoltaics (IPV) has grown in importance over recent years. This can in part be attributed to the creation of the Internet of Things (IoT) and Artificial Intelligence (AI) along with the vast amounts of data being processed in the field, which have been a massive accelerator for this development. Moreover, since energy conservation is being imposed as the national strategy of many countries and is being set as a top priority throughout the world, understanding and promoting IPV as the most promising indoor energy harvesting source is considered by many to be essential these days.

There are many contributing factors as to why this book is so special. First of all, I would like to deeply thank all the authors from around the world who found the time to contribute chapters on top of their world-class research, industrial work, and the launch of companies, projects and actual rockets. The book has exceeded my expectations in many ways. Not only did we manage to cover all topics that are essential for building an IPV device, but this book actually contributes to the research in the field. It has yielded collaborations among the chapter authors and the research community, many of which will hopefully be a seed for long-lasting and growing collaborations. Many chapters contain original research that was performed solely for this book, and some chapters contain work that is being published for the first time for a larger audience. On top of all that, the book was already in steady demand even during its writing.

Finally, I would like thank my publisher, Martin Scrivener, for his great and always helpful support, and Jean Markovich, who did outstanding work in copyediting the chapters. I am most grateful for this opportunity and the joy this work brings.