One‐Dimensional Electro‐Optical Simulations of Thin‐Film Solar Cells

Pieters, Bart E.; Decock, Koen; Stangl, Rolf; Kirchartz, Thomas

doi:10.1002/9783527636280.ch19

Cited by 12 publications

(11 citation statements)

References 47 publications

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“…62 It is likely that also nonradiative recombination requires at least one carrier to be mobile, as assumed in most recombination models involving traps. 63 Recently, band tails have been proposed as a means to aid separation of the CT state by Street, 10 and similar arguments have been made earlier by the Janssen group. 64 The proposed mechanism assumes that the concentration of available localized states at a donor-acceptor interface is reduced compared to the bulk of the material.…”

Section: Possible Explanations For the Small Influence Of Disordermentioning

confidence: 62%

Influence of energetic disorder on electroluminescence emission in polymer:fullerene solar cells

et al. 2012

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Electroluminescence (EL) spectroscopy and imaging can be useful techniques to analyze various loss mechanisms in solar cells, but the interpretation of the results is not trivial in solar cells made from disordered materials such as organic semiconductors. In this case the interpretation of EL measurements may be affected by the presence of a tail of localized states. Here, we study several polymer:fullerene systems and show that, despite the presence of tail states, the shape of the EL spectrum is insensitive to the applied voltage. This indicates that the emission originates mainly from mobile charges in higher lying states recombining at the polymer:fullerene interface and that most charges in deeper tail states do not contribute to the EL spectrum. The consequence of our finding is that simple models of EL emission in ideal semiconductors can be applied to polymer:fullerene solar cells and can therefore be used to evaluate the potential of different material systems in terms of recombination losses and to study resistive losses using luminescence imaging.

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Section: Possible Explanations For the Small Influence Of Disordermentioning

confidence: 62%

Influence of energetic disorder on electroluminescence emission in polymer:fullerene solar cells

et al. 2012

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“…1(a)], which would be consistent with ideality factors higher than 1 seen in materials like P3HT:PCBM. 6,7,20,49 The concentration of trapped charge carriers in a system with two identical tails (E chC = E chV = E ch ) scales approximately as 7,23,24,31,32,35,51 (see also the Supplemental Material 50 )…”

Section: Fig 1 (Color Online)mentioning

confidence: 99%

“…7,18,20,21 This distribution of electronic states leads to a discrepancy between the reaction order in terms of free carriers and the reaction order δ in terms of all measured carriers. In the classical multiple trapping theory used in modeling of both organic 7,22 and inorganic 23,24 solar cells based on disordered absorber materials, any recombination event involves at least one free charge carrier, while the second charge carrier might be sitting in a shallow trap in a band tail state. Assuming that the carriers in the band tails will still be extracted during the measurement, only part of the extracted electrons recombines with (all) holes, and vice versa.…”

Section: Introductionmentioning

confidence: 99%

Meaning of reaction orders in polymer:fullerene solar cells

2012

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Nongeminate recombination in polymer:fullerene solar cells is frequently characterized using transient optoelectronic measurements that allow the determination of recombination rates, charge carrier lifetimes, and average charge carrier concentrations as a function of voltage. These data are often interpreted in terms of an empirical reaction order defining how recombination depends on measured charge density. In polymer:fullerene solar cells, the empirical reaction orders are often considerably larger than 2, which had previously been explained in terms of the nonlinear relationship between mobile and trapped charge carriers in the presence of an exponential tail of localized states. Here, we show that experimentally determined reaction orders depend not only on the shape of the density of states but also on the spatial distribution of carriers. In particular, in solar cells with small depletion regions due to small active layer thicknesses or due to large unintentional background doping of the polymers, the reaction order can assume values that are much larger than the value expected from the shape of the density of states alone.

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“…The present Letter calculates the enhancement of the additional open-circuit voltage that is expected from photon recycling. This is relevant for two reasons: (i) Typical device simulators (such as the ones described in ref 26) for numerical simulations of solar cells do not consider photon recycling, and (ii) once photon recycling matters, also the optical properties of the solar cell such as parasitic absorption will affect the opencircuit voltage. 20 We therefore discuss how photon recycling depends on the optical and electronic properties of the solar cell.…”

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confidence: 99%

Impact of Photon Recycling on the Open-Circuit Voltage of Metal Halide Perovskite Solar Cells

2016

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Photon recycling has been recently shown to be measurable in perovskite solar cells. Here we discuss the impact of this effect on the open-circuit voltage of perovskite solar cells and show how the voltage boost due to photon recycling depends on electronic properties, such as Shockley–Read–Hall lifetimes, and on the optical properties of the device, such as the amount of parasitic absorption and the efficiency of light outcoupling.

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One‐Dimensional Electro‐Optical Simulations of Thin‐Film Solar Cells

Cited by 12 publications

References 47 publications

Influence of energetic disorder on electroluminescence emission in polymer:fullerene solar cells

Influence of energetic disorder on electroluminescence emission in polymer:fullerene solar cells

Meaning of reaction orders in polymer:fullerene solar cells

Impact of Photon Recycling on the Open-Circuit Voltage of Metal Halide Perovskite Solar Cells

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