Solution processed multi-junction polymer solar cells

Table 11.2 Solution processed multi-junction polymer solar cells.

Although multi-junction polymer solar cells are a valid strategy for reaching high PCEs, the increased number of layers that have to be processed on top of eaeh other increases the complexity of the fabrieation process. The first important factor is solvent orthogonality. Each of the layers has to be proeessed from a solution that will not damage or wash away any of the previously deposited layers. For processing on top of a bulk heterojunction polymenfullerene, only a few solvents can be used in praetiee water, aeetone, and aleohols. Typically, the photoactive layers are hydrophobie and this represents an obstacle to the deposition of materials from aqueous solutions beeause of poor wettability. Therefore, extra measures have to be taken such... 

Polymer multi-junction cells have also achieved noticeable attention. In Table 11.2 we provide an overview of the multi-junction cells that had been published up to the end of 2014. In 2007, Gilot et al showed that it is possible fully to solution process three photoactive layers and two recombination layers based on ZnO/PEDO PSS and obtain a working triple junction solar cell with koc = 2. 19 By the same procedure, six-fold junction cells with... 

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