Scientist layout tandem perovskite-silicon solar cell making use of a new approach to interface engineering

• Scientists from Solliance companions Delft University of Technology, Eindhoven University of Technology and TNO have established a tandem perovskite-silicon solar cell using a new strategy to interface engineering.

The team's searchings for show the potential of using (n)nc-SiOx: H as well as (n)nc-Si: H interfacial layers in tandem solar cells to decrease reflection losses at the interfaces between the perovskite and silicon sub-cells, as explained by the scientists. Through enhancing interference effects, these light monitoring strategies can be applied to different tandem structures.

The perovskite solar cell, with a 19.1% effectiveness, features an indium tin oxide (ITO) as well as glass substratum, a carbazole (2PACz) hole transport layer, a perovskite absorber, a buckminsterfullerene (C60) electron transport layer, a bathocuproine (BCP) buffer layer, as well as an aluminum (Al) metal contact.

In the tandem device, a nickel(II) oxide (NiOx) layer was utilized at the recombination junction to minimize electrical shunting. The presence of hydroxyl-rich NiOx facilitated the setting up of 2PACz, resulting in lowered electric shunts in the leading cells. Additionally, an anti-reflective coating based on magnesium fluoride (MgF2) as well as the optimization of C60 and also SnOx layer thickness assisted lessen reflection losses.

The champion solar cell accomplished a power conversion performance of 24.6%, an open-circuit voltage of 1.81 V, a short-circuit current of 18.1 mA/cm2, as well as a fill element of 75.0%.

By utilizing (n)nc-Si: H and also (n)nc-SiOx: H layers with thicknesses of around 95 nm as well as 115 nm, specifically, representation reductions of 1.35 mA/cm2 and 1.51 mA/cm2 were attained at the intermediate interfaces in between the perovskite and also c-Si bottom-cells, allowing for much better light coupling right into the bottom c-Si solar cells.

"This method can be adapted to different tandem designs to understand optimum light monitoring in tandem tools," the scientists mentioned.