Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV18)
DOI: https://doi.org/10.29363/nanoge.hopv.2018.119
Publication date: 21st February 2018
Multi-junction device architectures represent a promising strategy to further advance the efficiency of organic solar cells. For solution-processed organic solar cells, tandem and triple junction cells have been reported in the past. Here we demonstrate a first case of a quadruple-junction polymer solar cell, featuring four different and complementary band gap absorber layers that absorb light up to 1150 nm. The quadruple junction cell is fabricated using a combination of poly(3,4-ethylenedioxythiophene):polystyrene sulfonate and ZnO as interconnection layer in a n-i-p (inverted) configuration and reaches a power conversion efficiency of about 7.5% with an open-circuit voltage of 2.46 V. The thicknesses of the individual absorber layers were optimized using optical modeling and the experimental determination of the internal quantum efficiency (IQE) of the absorber layers for different thicknesses. Measuring the external quantum efficiency (EQE) of the quadruple cells has been accomplished using a protocol which makes use of bias light of different wavelengths, involving optical modeling and correcting for the build-up electric field. The short-circuit current density determined from integration of the EQE with the AM1.5G solar spectrum is consistent with the one measured in simulated solar light. The results are further validated by comparing the EQE of the quadruple cell to the calculated fraction of absorbed photons from optical modeling and the IQE of the absorber layers, obtaining a good agreement. The efficiency of the quadruple-junction polymer cells appears to be limited by bimolecular recombination in the active layers, which prevents the use of thick (>200 nm) layers.
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International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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