High-Voltage-Efficiency Inorganic Perovskite Solar Cells in a Wide Solution-Processing Window.

Area of Science:

• Materials Science
• Photovoltaics
• Solid-State Chemistry

Background:

• Inorganic halide perovskites offer structural stability and high open-circuit voltage (Voc), making them promising for photovoltaic applications.
• Achieving high power conversion efficiency (PCE) and stable performance in these materials often requires precise control over fabrication processes.
• Solution processing offers a scalable route for perovskite solar cell fabrication, but a wide processing window is crucial for industrial viability.

Purpose of the Study:

• To develop a general strategy for solution engineering of inorganic halide perovskites.
• To enhance the crystallization and photovoltaic performance of CsPbI2Br (CPI2).
• To establish a wide solution-processing window for high Voc and PCE inorganic perovskite solar cells (IPSCs).

Main Methods:

• Implemented a solution engineering strategy using dimethyl sulfoxide (DMSO) as a nontoxic solvent.
• Utilized an assisted heating process during the fabrication of CsPbI2Br (CPI2).
• Investigated the effect of varying solvent components and solute concentrations on crystallization and device performance.

Main Results:

• Achieved a wide solution-processing window for CPI2, accommodating diverse solvent compositions and concentrations.
• Fabricated CPI2-based inorganic perovskite solar cells (IPSCs) with a high power conversion efficiency (PCE) of up to 12.52%.
• Demonstrated a remarkable open-circuit voltage (Voc) of 1.315 V in the fabricated devices.

Conclusions:

• The developed solution engineering strategy significantly improves the crystallization and processability of inorganic halide perovskites.
• The high Voc and PCE achieved highlight the potential of CsPbI2Br for efficient solar energy conversion.
• The wide solution-processing window and enhanced performance facilitate potential industrial applications, particularly for tandem solar cells.