Berlin 2015 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 66: Focus Session (CPP with HL): Hybrid photovoltaics and perovskites I

HL 66.6: Vortrag

Donnerstag, 19. März 2015, 11:00–11:15, C 130

High efficiency hybrid triple junction solar cells comprising of amorphous silicon and low band gap polymers exceeding 11 % Power Conversion Efficiency. — •Steffen Roland¹, Sebastian Neubert², Steve Albrecht¹, Bernd Stannowski², Mark Seger³, Antonio Facchetti³, Rutger Schlatmann², Bernd Rech², and Dieter Neher¹ — ¹University of Potsdam, Institute of Physics and Astronomie, Potsdam, Germany — ²PVcomB/Helmholtz-Zentrum Berlin für Materialien und Energie GmBh, Berlin, Germany — ³Polyera Corporation, Illinois, USA

Merging inorganic and organic solar cells in a series connected hybrid multi-junction is shown to be an elegant approach to prepare efficient solar cells with a total active layer thickness well below 1 µm. Complementary absorption, high absorption coefficients, and the ease of fabrication make organic low band-gap (LBG) materials, mixed with PC₆₁BM, suitable for the use in multi-junction solar cells in combination with amorphous silicon (a-Si:H). Transfer matrix based optical modeling was employed to predict the optimum layer thicknesses of each. External quantum efficiency measurements show that all planar hybrid multi-junctions are current limited by the a-Si:H middle junction. Light scattering front contacts are used to increase the absorption and thereby currents in the amorphous silicon sub-cells. The presented multi-junction solar cells are highly efficient, showing high open circuit voltages and high fill factors up to 80 %. Therefore, merging inorganic/organic sub-cells in multi-junction devices bears great potential as efficient, truly thin film solar cells.