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Photoluminescence and electroluminescence of organic solar cells

In this white paper, written by Edinburgh Instruments read how photoluminescence and electroluminescence spectroscopy are used to probe new material compositions for optoelectronic devices to explain their structure and kinetics. Organic/polymer blends show great promise for solution-processed optoelectronic devices, such as solar cells, light emitting diodes and field-effect transistors. The excitation and photoluminescence spectra of said devices can be readily obtained in standard configuration fluorescence spectrometers, which are equipped with xenon lamps and photomultiplier tubes. Due to their short photoluminescence lifetimes from picoseconds to nanoseconds, it is essential ultrafast lasers, electronics and detectors are used to accurately obtain the transient photoluminescence connected to their diffusion characteristics. Furthermore, the electroluminescence spectra can yield insights about the charge transfer states of the blends upon carrier injection. In this white paper, we present the results on Poly(3-hexyl) thiophene-2,5-diyl (P3HT) and [6,6]-phenyl C61 butyric acid methyl ester (PCBM) devices and specify the required instrumentation for steady-state and time-resolved photoluminescence, as well as electroluminescence measurements.

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