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  • Journal article
    Calado P, Gelmetti I, Hilton B, Azzouzi M, Nelson J, Barnes PRFet al.,

    Driftfusion: An open source code for simulating ordered semiconductor devices with mixed ionic-electronic conducting materials in one-dimension

    The recent emergence of lead-halide perovskites as active layer materials forthin film semiconductor devices including solar cells, light emitting diodes,and memristors has motivated the development of several new drift-diffusionmodels that include the effects of both mobile electronic and ionic chargecarriers. The aim of this work is to provide a comprehensive guide toDriftfusion, a versatile simulation tool built for simulating one-dimensionalordered semiconductor devices with mixed ionic-electronic conducting layers.Driftfusion enables users to model devices with multiple, distinct, materiallayers and up to four charge carrier species: electrons and holes by defaultplus up to two ionic species. The time-dependent carrier continuity equationsare fully-coupled to Poisson's equation enabling transient optoelectronicdevice measurement protocols to be simulated. In addition to material anddevice-wide properties, users have direct access to adapt the physical modelsfor carrier transport, generation and recombination. Furthermore, agraded-interface approach circumvents the requirement for boundary conditionsat material interfaces and enables interface-specific properties, such as highrates of interfacial recombination, to be introduced.

  • Journal article
    Connolly JP, Barnham KWJ, Nelson J, Roberts C, Pate M, Roberts JSet al.,

    Short circuit current enhancement in GaAs/AlGaAs MQW solar cells

    The GaAs/AlGaAs quantum well solar cell (QWSC) shows promise as a novelapproach to higher efficiency solar cells but suffers from a poor short circuitcurrent Jsc. We report on efforts to reduce this problem with the use ofcompositional grading and back surface mirroring. We present experimentalquantum efficiency (QE) data on a range of compositionally graded QWSCs anddevices in which the back surface of the cell is coated with a mirror,increasing the optical thickness of the quantum well layer in the longwavelength range. The experimental QE spectra are reproduced by a model whichdeals with arbitrary compositional profiles and optical cavities formed in themirrored cells. The model is used to design an optimised QWSC, and projectedJsc values given. Applications including II-VI and tandem solar cells areconsidered.

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