| Work Detail |
Scientists at TU Delft in the Netherlands have built a perovskite-silicon tandem solar cell with a new approach to interface engineering.
A research group led by the Delft University of Technology (Netherlands) has developed a new solar cell for applications in perovskite-silicon tandem photovoltaic devices.
“Our findings demonstrate the potential of using (n)nc-SiOx:H and (n)nc-Si:H interfacial layers in tandem solar cells to minimize reflection losses at the interfaces between perovskite and silicon subcells” , explains Yifeng Zhao, lead author of the research. "By optimizing interference effects, these light management techniques can be applied to various tandem structures."
The perovskite solar cell, with an efficiency of 19.1%, features an indium tin oxide (ITO) and glass substrate, a carbazole hole transport layer (2PACz), a perovskite absorber, a layer of buckminsterfullerene (C60) electron transport, a bathocuproine (BCP) buffer layer, and an aluminum (Al) metal contact.
In the tandem device, a layer of nickel(II) oxide (NiOx) was used at the recombination junction to reduce electrical drift. The presence of hydroxyl-rich NiOx facilitated the assembly of the 2PACz, which reduced electrical shunts in the upper cells. In addition, an antireflective coating based on magnesium fluoride (MgF2) and optimization of the thickness of the C60 and SnOx layers helped to minimize reflection losses.
The champion solar cell achieved a power conversion efficiency of 24.6%, an open circuit voltage of 1.81 V, a short circuit current of 18.1 mA/cm2, and a fill factor of 75.0%.
Using layers of (n)nc-Si:H and (n)nc-SiOx:H with thicknesses of about 95 nm and 115 nm, respectively, reflection reductions of 1.35 mA/cm2 and 1.51 mA were achieved. /cm2 at the intermediate interfaces between the perovskite and the lower c-Si cells, allowing better light coupling into the lower c-Si solar cells.
They presented the cell in “ Optical Simulation-Aided Design and Engineering of Monolithic Perovskite/Silicon Tandem Solar Cells,” recently published in ACS Publications . The research group includes scientists from the Eindhoven University of Technology and the Dutch Organization for Applied Scientific Research (TNO).
“This technique can be adapted to different tandem designs to achieve optimal light management in tandem devices,” the scientists conclude. |
