Solar Cells Based on Inks of n-Type Colloidal Quantum Dots

Zhijun Ning, Haopeng Dong, Qiong Zhang, Oleksandr Voznyy, Edward H. Sargent

Research output: Contribution to journalArticlepeer-review

154 Scopus citations


© 2014 American Chemical Society. New inorganic ligands including halide anions have significantly accelerated progress in colloidal quantum dot (CQD) photovoltaics in recent years. All such device reports to date have relied on halide treatment during solid-state ligand exchanges or on co-treatment of long-aliphatic-ligand-capped nanoparticles in the solution phase. Here we report solar cells based on a colloidal quantum dot ink that is capped using halide-based ligands alone. By judicious choice of solvents and ligands, we developed a CQD ink from which a homogeneous and thick colloidal quantum dot solid is applied in a single step. The resultant films display an n-type character, making it suitable as a key component in a solar-converting device. We demonstrate two types of quantum junction devices that exploit these iodide-ligand-based inks. We achieve solar power conversion efficiencies of 6% using this class of colloids.
Original languageEnglish (US)
Pages (from-to)10321-10327
Number of pages7
JournalACS Nano
Issue number10
StatePublished - Sep 22 2014
Externally publishedYes


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