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Lead free perovskite solar cells based on a CsSnI3 light absorber with a spectral response from 950 nm is demonstrated. The high photocurrents noted in the system are a consequence of SnF2 addition which reduces defect concentrations and hence the background charge carrier density.
Michael Graetzel, Shaik Mohammed Zakeeruddin, Felix Thomas Eickemeyer
Kevin Sivula, Jun Ho Yum, Parnian Ferdowsi