Quantum Junction Solar Cells

Jiang Tang, Huan Liu, David Zhitomirsky, Sjoerd Hoogland, Xihua Wang, Melissa Furukawa, Larissa Levina, Edward H. Sargent

Research output: Contribution to journalArticlepeer-review

164 Scopus citations

Abstract

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 2); 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. © 2012 American Chemical Society.
Original languageEnglish (US)
Pages (from-to)4889-4894
Number of pages6
JournalNano Letters
Volume12
Issue number9
DOIs
StatePublished - Aug 16 2012
Externally publishedYes

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