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Caption : photos of solutions after reaction (a) and filtration (b).

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Caption : photograph of the pale yellow powder s1 obtained from solution in fig. s1a.

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Caption : photograph of the ph testing paper after dipped into the solution in fig. s1b.

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Caption : photograph of white crystals precipitated from the solution in fig. s1b.

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Caption : photograph of the white crystals (s2) obtained from fig. s4.

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Caption : xrd patterns of s1 (a) and s2 (b).

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Caption : report of the measurement and analysis of the chn content of s2.

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Caption :  (a) the statistical device parameters (a) and the j-v curves of the solar cells fabricated from solutions with [cu((nh2)2cs)3]2so4·h2o:incl3·4h2o:tu ratios of 1:2:0, 1:2:4 and 1:2:8.

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Caption :  (a) extraction of the idealilty factor (n) of the solar cell in fig.2c. (b) extraction of urbach energy (eu) from the eqe in fig.2d. (c) plots of the open-circuit voltage versus temperature (voc-t) and linear fit of activation energy (ea) of the device in fig.2c.

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Caption : the j-v curves (a), eqe spectra (b), and the xrd patterns (c) of the cisse devices (absorbers) respectively using cucl (black curves) and[cu((nh2)2cs)3]2so4·h2o” (red curves) as cu precursors.