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Earth Abundant Materials in Solar Cells
In this special topic, APL Materials is proud to present articles illustrating the current development of solar cell technologies that utilize earth-abundant and non-toxic elements that can be processed sustainably over large areas. Many of the papers contained in this issue showcase the power of combining experimental techniques for synthesis and characterization with theory and simulation.
Guest Editors: Aron Walsh, David O. Scanlon and Su-Huai Wei

Preface
Aron Walsh; David O. Scanlon; Su-Huai Wei
Research Updates
Nichole Cates; María Bernechea
Research Updates
Lana C. Lee; Tahmida N. Huq; Judith L. MacManus-Driscoll; Robert L. Z. Hoye
Contributed Articles
Band gap temperature-dependence and exciton-like state in copper antimony sulphide, CuSbS2
Open Access
Max Birkett; Christopher N. Savory; Mohana K. Rajpalke; Wojciech M. Linhart; Thomas J. Whittles; James T. Gibbon; Adam W. Welch; Ivona Z. Mitrovic; Andriy Zakutayev; David O. Scanlon; Tim D. Veal
Contributed Articles
Yuelin Li; Carolina Adamo; Clare E. Rowland; Richard D. Schaller; Darrell G. Schlom; Donald A. Walko
Research Updates
Francisco Willian de Souza Lucas; Andriy Zakutayev
Contributed Articles
Band gap temperature-dependence of close-space sublimation grown Sb2Se3 by photo-reflectance
Open Access
Max Birkett; Wojciech M. Linhart; Jessica Stoner; Laurie J. Phillips; Ken Durose; Jonathan Alaria; Jonathan D. Major; Robert Kudrawiec; Tim D. Veal
Contributed Articles
Jongseob Kim; Hyungjun Kim; Mahesh Chandran; Seung-Cheol Lee; Sang Hyuk Im; Ki-Ha Hong
Invited Articles
Reactive close-spaced sublimation processed CuSbSe2 thin films and their photovoltaic application
Open Access
Chong Wang; Bo Yang; Ruiqing Ding; Wenhao Chen; Rokas Kondrotas; Yang Zhao; Shuaicheng Lu; Zha Li; Jiang Tang
Contributed Articles
Predicting the thermodynamic stability of double-perovskite halides from density functional theory
Open Access
Dan Han; Tao Zhang; Menglin Huang; Deyan Sun; Mao-Hua Du; Shiyou Chen