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    A Model for the Operation of Perovskite Based Hybrid Solar Cells: Formulation, Analysis, and Comparison to Experiment

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    Type
    Article
    Authors
    Foster, J. M.
    Snaith, H. J.
    Leijtens, T.
    Richardson, G.
    KAUST Grant Number
    KUK-C1-013-04
    Date
    2014-01
    Permanent link to this record
    http://hdl.handle.net/10754/597311
    
    Metadata
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    Abstract
    This work is concerned with the modeling of perovskite based hybrid solar cells formed by sandwiching a slab of organic lead halide perovskite (CH3NH3PbI3-xClx) photo-absorber between (n-type) acceptor and (p-type) donor materialstypically titanium dioxide and spiro. A model for the electrical behavior of these cells is formulated based on drift-diffusion equations for the motion of the charge carriers and Poisson's equation for the electric potential. It is closed by (i) internal interface conditions accounting for charge recombination/generation and jumps in charge carrier densities arising from differences in the electron affinity/ionization potential between the materials and (ii) ohmic boundary conditions on the contacts. The model is analyzed by using a combination of asymptotic and numerical techniques. This leads to an approximateyet highly accurateexpression for the current-voltage relationship as a function of the solar induced photocurrent. In addition, we show that this approximate current-voltage relation can be interpreted as an equivalent circuit model consisting of three diodes, a resistor, and a current source. For sufficiently small biases the device's behavior is diodic and the current is limited by the recombination at the internal interfaces, whereas for sufficiently large biases the device acts like a resistor and the current is dictated by the ohmic dissipation in the acceptor and donor. The results of the model are also compared to experimental current-voltage curves, and good agreement is shown.
    Citation
    Foster JM, Snaith HJ, Leijtens T, Richardson G (2014) A Model for the Operation of Perovskite Based Hybrid Solar Cells: Formulation, Analysis, and Comparison to Experiment. SIAM Journal on Applied Mathematics 74: 1935–1966. Available: http://dx.doi.org/10.1137/130934258.
    Sponsors
    This work was partly supported by the EPSRC through grant EP/I01702X/1, and by the European Commission, under the SANS project, through grant agreement number 246124. This publication is partially based on work supported by award number KUK-C1-013-04, made by King Abdullah University of Science and Technology (KAUST), via an OCCAM visiting research fellowship awarded to the third author.
    Publisher
    Society for Industrial & Applied Mathematics (SIAM)
    Journal
    SIAM Journal on Applied Mathematics
    DOI
    10.1137/130934258
    ae974a485f413a2113503eed53cd6c53
    10.1137/130934258
    Scopus Count
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    Publications Acknowledging KAUST Support

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