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Quantum Junction Solar Cells
journal contribution
posted on 2012-09-12, 00:00 authored by Jiang Tang, Huan Liu, David Zhitomirsky, Sjoerd Hoogland, Xihua Wang, Melissa Furukawa, Larissa Levina, Edward H. SargentColloidal 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., TiO2); 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.
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Keywords
quantum Junction Solar CellsColloidal quantum dot solidspower conversion efficienciesprocessing platformAM 1.5quantum solidsbulk materialbulk acceptorquantum size effectquantum dotquantum junctionsquantum junctionquantum junction diodesphotovoltaic devicesmaterials synthesisquantum dot optoelectronicsoffering avenues
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