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Strong electron-phonon coupling and bipolarons in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mtext>Sb</mml:mtext><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mtext>S</mml:mtext><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>
Antimony sulphide (Sb$_2$S$_3$) is an Earth-abundant and non-toxic material that is under investigation for solar energy conversion applications. However, it still suffers from poor power conversion efficiency and a large open circuit voltage loss that have usually been attributed to point or interfacial defects and trap states. More recently, a …