MOSCOW, Jan. 28, 2021 /PRNewswire/ -- The research team from NUST MISIS has presented an improved structure of perovskite solar cells. Scientists have modified perovskite-based solar cells using MXenes — thin two-dimensional titanium carbides with high electrical conductivity. The MXenes-based modified cells showed superior performance, with power conversion efficiency exceeding 19% (the reference demonstrated 17%) and improved stabilized power output with respect to reference devices. The results have been published in the Nano energy international scientific journal.
Perovskite solar cells are promising alternative energy technology worldwide. They can be printed on special inkjet or slot die printers with minimal quantity of vacuum processes. This reduces the cost of the device compared to traditional silicon solar cell technology.
Their other advantages are flexibility (the solar cell can be made on substrates of PET, a common material for plastic bottles) and compactness. Perovskite solar cells can be mounted on the walls of buildings and curved surfaces of automobile panoramic roofs, receiving independent power supply.
The perovskite module has a sandwich structure: there is a process of collecting electrons between the layers. As a result, the energy of sunlight is converted into electrical energy. The layers are very thin — from 10 to 50 nanometers, and the "sandwich" itself is thinner than a human hair. The collection of the charge carriers in the solar cells should go with minimal losses during electron transport. The reduction of such losses in the device will increase the power of the solar cell.
A scientific group of physicists from NUST MISIS and the University of Tor Vergata (Rome, Italy) have shown experimentally that the addition of a small amount of titanium carbide-based MXenes to light-absorbing perovskite layers improves the electronic transport process and optimizes the performance of the solar cell. The name — MXenes comes from the synthesis process. The material is made by etching and exfoliation of the atomically thin metal carbides pre-coated with aluminum (MAX phases — layered hexagonal carbides and nitrides).
"The use of two-dimensional materials like MXenes to tune solar cell properties showed to be universal and could be applied to different architecture of perovskite solar cell. A further development will be performed transferring the the gathered knowledge to large-scale perovskite prototyping such as modules, BIPV devices as well as to energy harvesters for indoor light," - said Aldo Di Carlo, Professor at University of Rome Tor Vergata and team leader of Centre for Hybrid an Organic Solar Energy (CHOSE), Professor at NUST MISIS.
The solar cells developed with the new approach have shown improved characteristics with a power conversion efficiency exceeding 19%. This is 2% more in comparison to the reference devices.
The approach proposed by the developers can be easily scaled to the format of modules and large-area panels. Doping with MXenes does not change the fabrication sequence and integrated only to the initial stage of ink preparation without changes to architecture of the device.