Spatial distribution of light absorption in organic photovoltaic devices

Gruber, Dieter P.; Meinhardt, G.; Papousek, W.

doi:10.1016/j.solener.2005.06.008

Cited by 18 publications

(7 citation statements)

References 20 publications

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“…We model the absorption for a range of active layer thicknesses using the complex refractive indices and electric field intensity distributions in devices (Figures S5 and S6 of the Supporting Information). , Figure S6 demonstrates the need for optical modeling; the absorption is not monotonic with film thickness. − Thus, we compare the overall internal quantum efficiency (IQE) between different devices calculated from the J SC and optical absorption, as shown in Figure . Once changes in the absorption are accounted for due to thickness effects, it is clear that the photoconversion efficiency in terms of the overall IQE is invariant despite the use of different casting solvents and despite the thickness varying significantly (100–200 nm).…”

Section: Resultsmentioning

confidence: 99%

Mesoscopic Structural Length Scales in P3HT/PCBM Mixtures Remain Invariant for Various Processing Conditions

et al. 2013

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Mesoscopic structural length scales in the photoactive layer of organic solar cells affect exciton dissociation into charges and thus device performance. It is currently hypothesized that these length scales are largely affected by processing conditions such as annealing temperature, annealing time, and casting solvent. In our study, we utilized grazing incidence small-angle X-ray scattering and energy-filtered transmission electron microscopy to characterize the in-plane morphology of poly(3-hexylthiophene-2,5diyl)/[6,6]-phenyl-C 61 -butyric acid methyl ester mixtures and compared structural data with device performance. We found that the characteristic length scales of the mesostructures are dominated by the crystallization motif of the polymer and do not vary significantly for different processing conditions. For example, thermal annealing of films spun-cast from different solvents yielded similar in-plane morphologies; consequently, device performance was similar once thickness effects were accounted for through optical modeling.

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Section: Resultsmentioning

confidence: 99%

Mesoscopic Structural Length Scales in P3HT/PCBM Mixtures Remain Invariant for Various Processing Conditions

et al. 2013

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“…These graphs are intended to give an indication of where to search for new solar‐cell materials. Appropriate optical parameters are not the only criterion for the improvement of solar‐cell materials, but it will help us to estimate the energy absorption potential of new materials in a very straightforward way 27.…”

Section: Resultsmentioning

confidence: 99%

“…Due to its almost constant refractive index throughout the whole visible sunlight spectrum, the covering glass only decreases the amount of light absorption, but does not affect the location of the maximum and minimum of the absorption density inside the photovoltaic device. For that reason we did not consider the glass in our calculations 27. As an input to the optical modeling, the optical constants ( k , n ) of materials were taken from the literature 28–32.…”

Section: Introductionmentioning

confidence: 99%

Absorption properties of organic tandem solar cells for different wavelengths by computational simulation

Namvar

Hatami

Borhani

2012

Physica Status Solidi (a)

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In this work, we have been investigating an organic tandem solar cell composed of P3HT:PCBM and CuPc:C60 by using optical modeling and a simulation method to investigate the optimal design for different wavelengths. Energy dissipation flow per time is an important factor that can represent the absorption process in solar cells and plays an important role as a main source for exciton generation. The distribution of energy dissipation in terms of z, the distance in depth of the active‐layer thickness, was analyzed for the different wavelengths. From the simulation, photon‐absorbed profiles were derived in terms of front and back active‐layer thicknesses for different wavelengths. In ideal tandem solar cells, with a series configuration, each subcell must be engineered so that photocurrent can be accurately controlled by light absorption to balance the system. For this reason, in order to find the materials with appropriated absorption, we have identified a set of parameters including optical constants so that it gives an indication of the materials with desirable matching for an active layer with optimal thickness.

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“…If a photon reaches an interface, the probability is calculated whether the photon is transmitted through the interface or reflected. The light reflected at the interface is calculated based on Fresnel's equations by using the matrix material [16,17]. To simulate unpolarized light, the arithmetic mean of the reflection coefficients of TE and TM is calculated.…”

Section: A Simulation Of a Particle-filled Layermentioning

confidence: 99%

Comprehensive study on the light shielding potential of thermotropic layers for the development of new materials

2015

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In recent years thermotropic overheating protection glazings have been the focus for both solar thermal collector technology and architecture. A thermotropic glazing changes its light transmittance from highly transparent to light diffusing upon reaching a certain threshold temperature autonomously and reversibly. In thermotropic systems with fixed domains (TSFD) the scattering domains are embedded in a polymer matrix, which exhibits a sudden change of the refractive index upon reaching a threshold temperature. The aim of the present study was to comprehensively investigate the light shielding characteristics and potential of TSFD materials by applying simulation of light scattering in particle-filled layers. In random walk simulations a variety of parameters were varied systematically, and the effect on the light transmission behavior of TSFD was studied. The calculation steps of the simulation process are shown in detail. The simulations demonstrate that there is great potential for the production of functional materials with high overheating protection efficiency.

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Spatial distribution of light absorption in organic photovoltaic devices

Cited by 18 publications

References 20 publications

Mesoscopic Structural Length Scales in P3HT/PCBM Mixtures Remain Invariant for Various Processing Conditions

Mesoscopic Structural Length Scales in P3HT/PCBM Mixtures Remain Invariant for Various Processing Conditions

Absorption properties of organic tandem solar cells for different wavelengths by computational simulation

Comprehensive study on the light shielding potential of thermotropic layers for the development of new materials

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