Light trapping in organic solar cells

Niggemann, Michael; Riede, Moritz; Gombert, Andreas; Leo, Karl

doi:10.1002/pssa.200880461

Cited by 81 publications

(49 citation statements)

References 49 publications

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“…Light trapping constructions of various forms have been considered, and the interested reader is directed to the literature to read recent results on distributed Bragg refl ectors [ 156 ] and on macroscopic structures such as lenses, microcavities and Winston cones [157][158][159] We will here, however, limit our focus to two nanostructure-based light trapping approaches that are receiving current attention in hybrid and organic photovoltaics: scattering sub-wavelength particles and plasmonics.…”

Section: Nanostructures and Light Trappingmentioning

confidence: 99%

Nanostructured Organic and Hybrid Solar Cells

et al. 2011

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This Progress Report highlights recent developments in nanostructured organic and hybrid solar cells. The authors discuss novel approaches to control the film morphology in fully organic solar cells and the design of nanostructured hybrid solar cells. The motivation and recent results concerning fabrication and effects on device physics are emphasized. The aim of this review is not to give a summary of all recent results in organic and hybrid solar cells, but rather to focus on the fabrication, device physics, and light trapping properties of nanostructured organic and hybrid devices.

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Section: Nanostructures and Light Trappingmentioning

confidence: 99%

Nanostructured Organic and Hybrid Solar Cells

et al. 2011

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“…2011, 21, 3019-3028 Already, single heterojunction solar cells rely on optical interference effects and need to be designed accordingly, including considering any dependence on different angles of illumination. [44][45][46][47] The issue of angular dependence becomes even more relevant for tandem devices, because of the serial connection of the two subcells that could lead to a high angular sensitivity. Figure 7 shows the measured variation of the normalized IV parameters as function of cos( α ) of the illumination, where α is defi ned as the angle between the incident light and the normal to the solar cell surface.…”

Section: Light Intensity Angle Of Illumination and Temperature Depementioning

confidence: 99%

Efficient Organic Tandem Solar Cells based on Small Molecules

Riede

Uhrich

Widmer

et al. 2011

Adv Funct Materials

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228

144

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In this paper, two vacuum processed single heterojunction organic solar cells with complementary absorption are described and the construction and optimization of tandem solar cells based on the combination of these heterojunctions demonstrated. The red‐absorbing heterojunction consists of C60 and a fluorinated zinc phthalocyanine derivative (F4‐ZnPc) that leads to a 0.1–0.15 V higher open circuit voltage Voc than the commonly used ZnPc. The second heterojunction incorporates C60 and a dicyanovinyl‐capped sexithiophene derivative (DCV6T) that mainly absorbs in the green. The combination of both heterojunctions into one tandem solar cell leads to an absorption over the whole visible range of the sun spectrum. Thickness variations of the transparent p‐doped optical spacer between both subcells in the tandem solar cell is shown to lead to a significant change in short circuit current density jsc due to optical interference effects, whereas Voc and fill factor are hardly affected. The maximum efficiency η of about 5.6% is found for a spacer thickness of 150‐165 nm. Based on the optimized 165nm thick spacer, effects of intensity and angle of illumination, and temperature on a tandem device are investigated. Variations in illumination intensity lead to a linear change in jsc over three orders of magnitude and a nearly constant η in the range of 30 to 310 mW cm−2. Despite the stacked heterojunctions, the performance of the tandem device is robust against different illumination angles: jsc and η closely follow a cosine behavior between 0° and 70°. Investigations of the temperature behavior of the tandem device show an increase in η of 0.016 percentage points per Kelvin between −20 °C and 25 °C followed by a plateau up to 50 °C. Finally, further optimization of the tandem stack results in a certified η of (6.07 ± 0.24)% on (1.9893 ± 0.0060)cm2 (Fraunhofer ISE), i.e., areas large enough to be of relevance for modules.

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“…The optical interference effect of the multilayer solar cells has been modeled based on the finite element method (FEM) [2,3], the rigorous coupled-wave analysis (RCWA) [4,5], and the transfer matrix method (TMM) [6][7][8]. Among them, the TMM has been widely used for thin-film OSCs due to its relatively ease of simulation code implementation but high accuracy in calculation results.…”

Section: Introductionmentioning

confidence: 99%

Optical Modeling for Polarization-dependent Optical Power Dissipation of Thin-film Organic Solar Cells at Oblique Incidence

Kim¹,

Jung²,

Jeong³

2012

Journal of the Optical Society of Korea

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We present the optical models and calculation results of thin-film organic solar cells (OSCs) at oblique incidence of light, using the transfer matrix method. The simple expression for the optical power dissipation is derived at oblique incidence for s-and p-polarized light. The spatial distribution of the electric field intensity, the optical power density, and the optical power dissipation are calculated in both s-and p-polarized light with respect to the incidence angle. We identify how the light absorption efficiency for p-polarized light becomes relatively larger than that for s-polarized light as the incidence angle increases.

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Light trapping in organic solar cells

Cited by 81 publications

References 49 publications

Nanostructured Organic and Hybrid Solar Cells

Nanostructured Organic and Hybrid Solar Cells

Efficient Organic Tandem Solar Cells based on Small Molecules

Optical Modeling for Polarization-dependent Optical Power Dissipation of Thin-film Organic Solar Cells at Oblique Incidence

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