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    Colloidal quantum dot solar cells exploiting hierarchical structuring

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    Type
    Article
    Authors
    Labelle, André J.
    Thon, Susanna
    Masala, Silvia
    Adachi, Michael M.
    Dong, Haopeng
    Farahani, Maryam
    Ip, Alexander H.
    Fratalocchi, Andrea cc
    Sargent, E. H.
    KAUST Department
    Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
    Electrical Engineering Program
    KAUST Solar Center (KSC)
    Material Science and Engineering Program
    PRIMALIGHT Research Group
    Physical Science and Engineering (PSE) Division
    KAUST Grant Number
    KUS-11-009-21
    Date
    2015-01-09
    Online Publication Date
    2015-01-09
    Print Publication Date
    2015-02-11
    Permanent link to this record
    http://hdl.handle.net/10754/564053
    
    Metadata
    Show full item record
    Abstract
    Extremely thin-absorber solar cells offer low materials utilization and simplified manufacture but require improved means to enhance photon absorption in the active layer. Here, we report enhanced-absorption colloidal quantum dot (CQD) solar cells that feature transfer-stamped solution-processed pyramid-shaped electrodes employed in a hierarchically structured device. The pyramids increase, by up to a factor of 2, the external quantum efficiency of the device at absorption-limited wavelengths near the absorber band edge. We show that absorption enhancement can be optimized with increased pyramid angle with an appreciable net improvement in power conversion efficiency, that is, with the gain in current associated with improved absorption and extraction overcoming the smaller fractional decrease in open-circuit voltage associated with increased junction area. We show that the hierarchical combination of micron-scale structured electrodes with nanoscale films provides for an optimized enhancement at absorption-limited wavelengths. We fabricate 54.7° pyramid-patterned electrodes, conformally apply the quantum dot films, and report pyramid CQD solar cells that exhibit a 24% improvement in overall short-circuit current density with champion devices providing a power conversion efficiency of 9.2%.
    Citation
    Labelle, A. J., Thon, S. M., Masala, S., Adachi, M. M., Dong, H., Farahani, M., … Sargent, E. H. (2015). Colloidal Quantum Dot Solar Cells Exploiting Hierarchical Structuring. Nano Letters, 15(2), 1101–1108. doi:10.1021/nl504086v
    Sponsors
    This publication is based in part on work supported by Award KUS-11-009-21, 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. We thank Angstrom Engineering, Inc. and Innovative Technology, Inc. for useful discussions regarding material deposition methods and control of the glovebox environment, respectively. H.D. would like to acknowledge financial support from China Scholarship Council (CSC). The authors thank Larissa Levina for the assistance of CQDs synthesis and E. Palmiano, R. Wolowiec, G. Koleilat, and D. Kopilovic for their technical help over the course of this study. We also thank Professor Heman Miguez of the Institute of Materials Science of Seville for very helpful discussions regarding electrode structuring. We would finally like to thank Professor Peter Herman and Dr. Kitty Kumar, both of the Electrical and Computer Engineering Department at the University of Toronto, for materials and assistance in preparing the Silicon master.
    Publisher
    American Chemical Society (ACS)
    Journal
    Nano Letters
    DOI
    10.1021/nl504086v
    ae974a485f413a2113503eed53cd6c53
    10.1021/nl504086v
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; PRIMALIGHT Research Group; Electrical and Computer Engineering Program; Material Science and Engineering Program; KAUST Solar Center (KSC); Computer, Electrical and Mathematical Science and Engineering (CEMSE) Division

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