Electrical engineering

Engineering

Perovskite (structure)

Composite material

Voltage

Nanotechnology

Halide

Organic chemistry

Inorganic chemistry

Chemistry

Materials science

Crystallization

Energy conversion efficiency

Tandem

Dimethyl sulfoxide

Photovoltaic system

Chemical engineering

Optoelectronics

Photovoltaics

Open-circuit voltage

High voltage

The Journal of Physical Chemistry Letters

Inorganic halide perovskites exhibit significant photovoltaic performance due to their structural stability and high open-circuit voltage (Voc). Herein, a general strategy of solution engineering has been implemented to enable a wide solution-processing window for high Voc (∼1.3 V) and power conversion efficiency (PCE, ∼12.5%). We introduce a nontoxic solvent of dimethyl sulfoxide (DMSO) and an assisted heating process in the fabrication of CsPbI2Br (CPI2) to control the improved crystallization. A wide solution-processing window including a wide range of solvent components and solute concentrations has been realized. The CPI2-based inorganic perovskite solar cells (IPSCs) exhibit a high PCE up to 12.52%. More importantly, these devices demonstrate a remarkable Voc of 1.315 V. The performance has possessed such a region with high Voc and PCE in all Cs-based IPSCs, unveiling wide solution-processing windows with enhanced solution processability facilitating potential industrial application especially for tandem solar cells.

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