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Quantum Junction Solar Cells

By Jiang Tang (1437973), Huan Liu (281351), David Zhitomirsky (88338), Sjoerd Hoogland (1454962), Xihua Wang (618946), Melissa Furukawa (2045875), Larissa Levina (1454950) and Edward H. Sargent (1363284)


Colloidal quantum dot solids combine convenient solution-processing with quantum size effect tuning, offering avenues to high-efficiency multijunction cells based on a single materials synthesis and processing platform. The highest-performing colloidal quantum dot rectifying devices reported to date have relied on a junction between a quantum-tuned absorber and a bulk material (e.g., TiO<sub>2</sub>); however, quantum tuning of the absorber then requires complete redesign of the bulk acceptor, compromising the benefits of facile quantum tuning. Here we report rectifying junctions constructed entirely using inherently band-aligned quantum-tuned materials. Realizing these quantum junction diodes relied upon the creation of an n-type quantum dot solid having a clean bandgap. We combine stable, chemically compatible, high-performance n-type and p-type materials to create the first quantum junction solar cells. We present a family of photovoltaic devices having widely tuned bandgaps of 0.6–1.6 eV that excel where conventional quantum-to-bulk devices fail to perform. Devices having optimal single-junction bandgaps exhibit certified AM1.5 solar power conversion efficiencies of 5.4%. Control over doping in quantum solids, and the successful integration of these materials to form stable quantum junctions, offers a powerful new degree of freedom to colloidal quantum dot optoelectronics

Topics: Medicine, Neuroscience, Biotechnology, Sociology, Immunology, Science Policy, Space Science, Astronomical and Space Sciences not elsewhere classified, Biological Sciences not elsewhere classified, Mathematical Sciences not elsewhere classified, Chemical Sciences not elsewhere classified, Physical Sciences not elsewhere classified, quantum Junction Solar CellsColloidal quantum dot solids, power conversion efficiencies, processing platform, AM 1.5, quantum solids, bulk material, bulk acceptor, quantum size effect, quantum dot, quantum junctions, quantum junction, quantum junction diodes, photovoltaic devices, materials synthesis, quantum dot optoelectronics, offering avenues
Year: 2012
DOI identifier: 10.1021/nl302436r.s001
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Provided by: FigShare
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