The complete in-gap electronic structure of colloidal quantum dot solids and its correlation with electronic transport and photovoltaic performance
Fischer, Armin H.
Kirmani, Ahmad R.
Rollny, Lisa R.
Chou, Kang Wei
Carey, Graham H.
Dowben, Peter A.
Sargent, E. H.
KAUST DepartmentKAUST Solar Center (KSC)
Physical Sciences and Engineering (PSE) Division
KAUST Catalysis Center (KCC)
Materials Science and Engineering Program
Organic Electronics and Photovoltaics Group
Functional Nanomaterials Lab (FuNL)
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AbstractThe direct observation of the complete electronic band structure of a family of PbS CQD solids via photoelectron spectroscopy is reported. We investigate how materials processing strategies, such as the latest passivation methods that produce record-performance photovoltaics, achieve their performance advances. Halide passivated films show a drastic reduction in states in the midgap, contributing to a marked improvement in the device performance. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
SponsorsThis publication is based in part on work supported by Award KUS-11009- 21 made by King Abdullah University of Science and Technology (KAUST), by the Ontario Research Fund Research Excellence Program, and by the Natural Sciences and Engineering Research Council (NSERC) of Canada. The authors acknowledge the help of Dr. C. Y. Kim, K. W. Kemp, and D. Kopilovic. Computations were performed on the TCS supercomputer at the SciNet HPC Consortium. SciNet is funded by the Canada Foundation for Innovation under the auspices of Compute Canada, the Government of Ontario, the Ontario Research Fund -Research Excellence, and the University of Toronto.  Research described in this paper was performed at the Canadian Light Source, which is funded by the Canada Foundation for Innovation, the Natural Sciences and Engineering Research Council of Canada, the National Research Council Canada, the Canadian Institutes of Health Research, the Government of Saskatchewan, Western Economic Diversification Canada, and the University of Saskatchewan.