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Los Alamos Develops New Technique For Growing Perovskite Solar Cells

Solution-based, hot-casting allows growth of solar cells from large-area perovskite crystals

This week in the journal Science, Los Alamos National Laboratory researchers revealed a new solution-based hot-casting technique that allows growth of highly efficient and reproducible solar cells from large-area perovskite crystals.

"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.

State-of-the-art photovoltaics using high-purity, large-area, wafer-scale single-crystalline semiconductors grown by sophisticated, high temperature crystal-growth processes are seen as the future of efficient solar technology. Solar cells composed of organic-inorganic perovskites offer efficiencies approaching that of silicon, but they have been plagued with some important deficiencies limiting their commercial viability. It is this failure that the Los Alamos technique successfully corrects.

The researchers fabricated planar solar cells from pervoskite materials with large crystalline grains that had efficiencies approaching 18 percent, 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.

"Characterisation 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 GaAs."

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.

The work at Los Alamos National Laboratory was supported by a DOE Office of Basic Energy Sciences proposal and by the Los Alamos National Laboratory Directed Research and Development (LDRD) program. This work was done in part at the Center for Integrated Nanotechnologies, a DOE Office of Science User Facility.

"˜High Efficiency Solution-Processed Perovskite Solar Cells with Millimeter-Scale Grains' by Wanyi Nie et al, appeared in Science 30 January 2015: Vol. 347 no. 6221 DOI:10.1126/science.aaa0472



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