Comparison of Electroluminescence Intensity and Photocurrent of Polymer Based Solar Cells

Hoyer, U.; Pinna, Luigi; Swonke, Thomas; Auer, R.; Brabec, Christoph J.; Stubhan, Tobias; Li, Ning

doi:10.1002/aenm.201100496

Cited by 19 publications

(14 citation statements)

References 26 publications

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“…), changes in sheet resistance, and for visualizing short circuit current distributions. [ 50,[56][57][58][59][60] All lock-in images are represented as the 0° (in-phase) signal. Experimental details regarding the setup and the interpretation of the signals are presented in the Experimental Section and the Supporting Information.…”

Section: Ir Imaging Of Moisture-induced Degradationmentioning

confidence: 99%

Water Ingress in Encapsulated Inverted Organic Solar Cells: Correlating Infrared Imaging and Photovoltaic Performance

Adams

Salvador

Lucera

et al. 2015

Advanced Energy Materials

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Understanding the degradation and failure mechanisms of organic photovoltaic devices is a key requirement for this technology to mature toward a reliable product. Here, an investigation on accelerated temperature and moisture long‐term stability testing (>20 000 h) of inverted and glass‐encapsulated poly(3‐hexylthiophene)/phenyl‐C61‐butyric acid methyl ester solar cells is presented. The degradation kinetics is analyzed using the Arrhenius model and the resulting activation energy for the diffusion of water is measured to be ≈43 kJ mol−1. Through comparison of electroluminescence imaging, lock‐in thermography, and photoluminescence mapping, the device performance is correlated with the loss of effective cell area and it is shown that the reaction of water at the hole extraction/active layer interface is likely to be the dominant cause for long‐term device failure. The diffusion of water through the packaged solar cell is described using classical diffusion theory. Based on an analytical solution of a simple diffusion model, the diffusion coefficient is estimated to be 4 × 10−12 m2 s−1. A shelf life of 100 000 h is anticipated at 65 °C/85% RH using a 9.3 cm wide protective adhesive rim. The findings of this study may inform strategies for predicting lifetimes of organic solar cells and modules based on local in situ tracking of moisture‐induced device performance loss using IR imaging.

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Section: Ir Imaging Of Moisture-induced Degradationmentioning

confidence: 99%

Water Ingress in Encapsulated Inverted Organic Solar Cells: Correlating Infrared Imaging and Photovoltaic Performance

Adams

Salvador

Lucera

et al. 2015

Advanced Energy Materials

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“…Both Eqs. (1) and (3) have been extensively tested in a series of different material systems [90][91][92][93][94][95][96][97]. Usually, the agreement is very good within the experimental error.…”

Section: B Reciprocity Relationsmentioning

confidence: 99%

Thermodynamics of light management in photovoltaic devices

2014

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This paper elaborates a comprehensive theory of the thermodynamics of light management in solar cells explicitly considering imperfect light trapping, parasitic absorption and nonradiative recombination losses. A quantitative description of the entropic losses that reduce the open-circuit voltage and the energy conversion efficiency from the radiative limit towards realistic situations is presented. The theory embraces the fundamental limits for idealized solar cell devices given by the Yablonovitch limit and the Shockley-Queisser limit. We discriminate between reversible and irreversible entropic loss processes for four fundamental light management concepts: (i) conventional light trapping as an integral part of the device, (ii) geometric concentration of incident light, (iii) angular restriction of incoming and outgoing light, and (iv) light concentration by luminescent solar collectors. Based on this discrimination, a comprehensive discussion of the interplay between the loss processes and light management is presented. As part of this analysis, a new figure of merit for efficient light trapping in solar cells is introduced as well as an example of a deterministic light trapping concept which induces almost optimal light trapping.

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“…The fact that the spectral shape of the EL emission is dominated by 'free' charge carriers 35 makes it possible to use quantitative models based on the recombination of free carriers in inorganic semiconductors and has profound implications for the relation between EL and open circuit voltage 23 as well as for the interpretation of absolute EL intensities in EL imaging. 36,37 …”

Section: Introductionmentioning

confidence: 99%

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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Comparison of Electroluminescence Intensity and Photocurrent of Polymer Based Solar Cells

Cited by 19 publications

References 26 publications

Water Ingress in Encapsulated Inverted Organic Solar Cells: Correlating Infrared Imaging and Photovoltaic Performance

Water Ingress in Encapsulated Inverted Organic Solar Cells: Correlating Infrared Imaging and Photovoltaic Performance

Thermodynamics of light management in photovoltaic devices

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

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