Wafer-scale perovskite solar cells on the horizon
“These perovskite crystals offer promising routes for developing low-cost, solar-based, clean global energy solutions for the future,” said Aditya Mohite, the Los Alamos scientist leading the project.
The researchers fabricated planar solar cells from pervoskite materials with large crystalline grains that had efficiencies approaching 18%, among the highest reported in the field of perovskite-based light-to-energy conversion devices. The cells demonstrate little cell-to-cell variability, resulting in devices showing hysteresis-free photovoltaic response, which had been a fundamental bottleneck for stable operation of perovskite devices.
“Characterization and modeling attribute the improved performance to reduced bulk defects and improved charge-carrier mobility in large-grain pervoskite materials,” said Mohite, “and we’ve demonstrated that the crystalline quality is on par with that observed for high-quality semiconductors like silicon and gallium arsenides.”
The researchers anticipate that their crystal growth technique will lead the field towards synthesis of wafer-scale crystalline perovskites necessary for the fabrication of high-efficiency solar-cells and be applicable to several other material systems plagued by polydispersity, defects and grain boundary recombination in solution-processed thin-films.
Reference: Science magazine (issue of Jan. 30, 2015, Vol. 347, #6221): High Efficiency Solution-Processed Perovskite Solar Cells with Millimeter-Scale Grains.
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