1：Experimental Design and Method Selection:

The perovskite microcrystals were synthesized via liquid phase method. The microcrystalline device was made in a single-step printable Cs4CuSb2Cl12/carbon materials composite paste.

2：Sample Selection and Data Sources:

Cesium chloride (99.9%, Sigma-Aldrich), antimony chloride (99.9%, Aldrich), copper chloride dihydrate (99.0%, Sigma-Aldrich) were used in the synthesis.

3：9%, Sigma-Aldrich), antimony chloride (9%, Aldrich), copper chloride dihydrate (0%, Sigma-Aldrich) were used in the synthesis. List of Experimental Equipment and Materials:

3. List of Experimental Equipment and Materials: Cs4CuSb2Cl12 microcrystals were prepared by mixing CsCl (10 mmol), SbCl3 (5 mmol) and CuCl2 (2.5 mmol) in adequate amounts of ethanol at room temperature under stirring.

4：5 mmol) in adequate amounts of ethanol at room temperature under stirring. Experimental Procedures and Operational Workflow:

4. Experimental Procedures and Operational Workflow: The mixture was immediately turned to black precipitate which was filtered and dried. The devices were fabricated by depositing 1 cm2 active area of a single-step printable paste across a thermally coated Al electrodes on a glass substrate.

5：Data Analysis Methods:

The varying weight percentages of the photoactive material along with 2:1 weight ratio of activated carbon and graphite in Dimethylformamide was tested for its photovoltaic applications.