title: Photovoltaic Performance of PbS Quantum Dots Treated with Metal Salts.
abstract: Recent advances in quantum dot surface passivation have led to a rapid development of high-efficiency solar cells. Another critical element for achieving efficient power conversion is the charge neutrality of quantum dots, as charge imbalances induce electronic states inside the energy gap. Here we investigate how the simultaneous introduction of metal cations and halide anions modifies the charge balance and enhances the solar cell efficiency. The addition of metal salts between QD deposition and ligand exchange with 1,3-BDT results in an increase in the short-circuit current and fill factor, accompanied by a distinct reduction in a crossover between light and dark current density-voltage characteristics.
authors.affiliation: Department of Electrical and Computer Engineering, New Jersey Institute of Technology , Newark, New Jersey 07102, United States.|Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States.
authors.forename: Dong-Kyun
authors.initials: DK
authors.lastname: Ko
authors.affiliation: Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States.|Advanced Energy Lab, Samsung Advanced Institute of Technology (SAIT)-America , 1 Cambridge Center, Suite 702, Cambridge, Massachusetts 02142, United States.
authors.forename: Andrea
authors.initials: A
authors.lastname: Maurano
authors.affiliation: Advanced Energy Lab, Samsung Advanced Institute of Technology (SAIT)-America , 1 Cambridge Center, Suite 702, Cambridge, Massachusetts 02142, United States.
authors.forename: Su Kyung
authors.initials: SK
authors.lastname: Suh
authors.affiliation: Department of Materials Science and Engineering, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States.|Center for Computational Science, Korea Institute of Science and Technology (KIST) , Hwarangno 14-gil 5, Seongbuk-gu, Seoul 02792, Republic of Korea.
authors.forename: Donghun
authors.initials: D
authors.lastname: Kim
authors.affiliation: Department of Materials Science and Engineering, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States.|Center for Electronic Materials, Korea Institute of Science and Technology (KIST) , Hwarangno 14-gil 5, Seongbuk-gu, Seoul 02792, Republic of Korea.|Department of Chemistry, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States.
authors.forename: Gyu Weon
authors.initials: GW
authors.lastname: Hwang
authors.affiliation: Department of Materials Science and Engineering, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States.
authors.forename: Jeffrey C
authors.initials: JC
authors.lastname: Grossman
authors.affiliation: Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States.
authors.forename: Vladimir
authors.initials: V
authors.lastname: Bulović
authors.affiliation: Department of Chemistry, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States.
authors.forename: Moungi G
authors.initials: MG
authors.lastname: Bawendi
keywords: metal salts; nanocrystals; photovoltaics; quantum dots; solar cells