Regensburg 2010 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 62: Poster II: Photovoltaics and Organic Semiconductors
HL 62.21: Poster
Donnerstag, 25. März 2010, 18:00–20:00, Poster D2
Spectrally and angle resolved emission of a Rh6G based fluorescence collector — •Hendrik Sträter1, Sebastian Knabe1, Nazila Soleimani2, Tom Markvart2, and Gottfried H. Bauer1 — 1Institute of Physics, Carl von Ossietzky University Oldenburg, D-26111 Oldenburg — 2School of Engineering Sciences, University of Southampton, SO17 1BJ, UK
Concentration of light based on the fluorescence of well-chosen dyes offers the possibility to decrease the cost of multispectral solar cells. Unfortunately the theoretical efficiency has not been achieved, mainly because of photon transport losses via the loss cone of emission. With increasing dye concentration the effect of reemission of fluorescence light rises and thereby the losses of photons due to the loss cone.
To understand the reemission as a major loss mechanism we measure the spectrum of the light that leaves the edge of the concentrator as a function of the distance between illumination position and edge when illuminating perpendicularly to the surface. For the measurement we used a thin layer of Rhodamine 6G embedded in a Poly(methyl methacrylate) matrix on a glass substrate. The results of spectrally and angle resolved fluorescence emission are compared with those under homogeneous illumination. We compare our data with the results of a theoretical model, which analytically formulates the effects of absorption and subsequent reemission of fluorescence photons in the collector.