Recombination layers inverted configuration

Figure 11.2 Schematic representations of the regular and inverted device layouts for series-connected organic tandem cells. Under operation the indium tin oxide (ITO) electrode is biased positive with respect to the metal electrode in the regular configuration and negative in the inverted configuration. The difference is caused hy the positioning of the hole and electron collecting layers (HCL and ECL) with respect to photoactive layers. The intermediate contact formed hy HCL and ECL is referred to as the recombination layer. Note that in practice the device layout may vary from these schematics.

In 2010, Yang et al published the first inverted configuration tandem polymer solar cell using P3HT PC6iBM and PSBTBT PC7iBM subcells. As a recombination layer, Yang et al used thermally evaporated MoOj and Al, covered with a sol-gel ZnO layer to reach a PCE of 5.1%. Almost at the same... 

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