Scientists at TU Delft have constructed a tandem perovskite-silicon photo voltaic cell with a brand new methodology of interface engineering. The machine has an open-circuit voltage of 1.81 V, a short-circuit present of 18.1 mA/cm2, and a fill issue of 75.0%.
A analysis group led by Delft College of Expertise within the Netherlands developed a brand new photo voltaic cell for functions in perovskite-silicon tandem PV units.
“Our findings present the potential of utilizing (n)nc-SiOx:H and (n)nc-Si:H interfacial layers in tandem photo voltaic cells to scale back reflection losses on the interfaces between perovskite and silicon sub-cells,” mentioned Yifeng Zhao, the lead writer of the analysis. “By optimizing the interference results, these light-handling strategies may be utilized to completely different tandem constructions.”
The perovskite photo voltaic cell, with 19.1% effectivity, has an indium tin oxide (ITO) and glass substrate, a carbazole (2PACz) gap transport layer, a perovskite absorber, a buckminsterfullerene (C60) electron transport layer, a bathocuproine (BCP) buffer layer, and an aluminum (Al) steel contact.
Within the tandem machine, a nickel(II) oxide (NiOx) layer is used within the recombination junction to scale back electrical shunting. The presence of hydroxyl-rich NiOx facilitates the meeting of 2PACz, leading to decreased electrical shunt in floor cells. As well as, an anti-reflective coating primarily based on magnesium fluoride (MgF2) and the optimization of C60 and SnOx layer thickness helped to scale back the reflection loss.
The champion photo voltaic cell achieved an influence conversion effectivity of 24.6%, an open-circuit voltage of 1.81 V, a short-circuit present of 18.1 mA/cm2, and a fill issue at 75.0%.
Through the use of (n)nc-Si:H and (n)nc-SiOx:H layers with a thickness of about 95 nm and 115 nm, respectively, the reflection decreases to 1.35 mA / cm2 and 1.51 mA / cm2 achieved on the intermediate interfaces between the perovskite and c-Si bottom-cells, which permits for higher gentle coupling to the underside c-Si photo voltaic cells.
They offered the cell in “Optical Simulation-Aided Design and Engineering of Monolithic Perovskite/Silicon Tandem Photo voltaic Cells,” lately printed in ACS Publications. The analysis crew consists of scientists from Eindhoven College of Expertise and the Netherlands Group for Utilized Scientific Analysis (TNO).
“This system may be tailored to completely different tandem designs to understand optimum gentle administration in tandem units,” the scientists concluded.
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