Scientist analyze exactly how molybdenum ditelluride might enhance service provider generation in perovskite solar cells

• Scientists from South Korea's Sungkyunkwan University (SKKU) have discovered that molybdenum ditelluride could enhance carrier generation in perovskite solar cells.

They substitute a tandem solar cell with two absorbers based on methylammonium lead triiodide (CH3NH3PbI3)-- a perovskite with high photoluminescence quantum return-- as well as molybdenum ditelluride (MoTe2), which is understood for being naturally p-doped, with cascaded bandgaps to absorb a wider solar spectrum. The team determined that its efficiency can exceed 20%.

The team constructed the cell with an indium tin oxide (ITI) substrate, an electron transport layer (ETL) based upon titanium oxide (TiO2), a CH3NH3PbI3 layer, a MoTe2 layer, a spiro-OMeTAD hole-blocking layer, and also a silver (Ag) metal contact.

The researchers clarified that the desirable band placement of MoTe2 with various other layers, together with its high near-infrared (NIR) absorption capacity, leads the way for achieving greater photovoltaic effectiveness. They likewise kept in mind that the optimal density of the MoTe2 absorber must be around 25 nanometers.

They located that the CH3NH3PbI3 and also MoTe2 layers added to 61% and 39% of carrier generation, respectively. They kept in mind that a cell produced with this arrangement could get to a power conversion performance of 20.32%.

According to the team, the outcomes showed a significant increase in the perovskite solar cell effectiveness stemming from the short circuit existing, compared to the cell without MoTe2. Nevertheless, stacking the absorbers with various bandgaps resulted in a decline in the open-circuit voltage, as a result of the hole transport degeneration in the absorbing location.

" In order to ease the unavoidable issue, we inserted a graphene oxide layer with a thickness of 1.5 nm. Consequently, we observed that the open circuit voltage increases as long as 0.1 eV," they said.

The researchers are currently trying to obtain experimental lead to line with their simulation results.

" Transition-metal dichalcogenides (TMDs) such as MoTe2 are not as well pricey as well as can be quickly prepared via peeling method and expanding, that is, the price of a cell here is not an issue," the team discussed. "However, there are some technical as well as experimental issues that must be resolved, such as the perfect transfer of MoTe2 flakes on rough perovskite layers or high interlayer recombination of two absorbers."