Indian researchers have built a quadrupole silicon perovskite solar cell that uses a state-of-the-art perovskite device with an efficiency of up to 17.1%. The top cell contains a transparent conductive electrode (TCE) sputtered at room temperature as the back electrode.
The scientists said the cell offers excellent stability in the dark as well as continuous heating conditions, according to “Stable and Efficient Large-Area 4T Si/perovskite Tandem Photovoltaics with Sputtered Transparent Contact,” published recently RRL sun.
“Many high-efficiency results from the field do not reveal the architecture of the device and are not too useful for advancing academic research,” researcher Dinesh Kabra said. pv magazine. “Our report not only presents the entire device architecture, but also explains the manufacturing process as a typical academic research practice. We have also provided raw data related to the dark and light IV scan and EQE spectrum as part of additional information for further development by community simulation experts to advance this field.
The Top perovskite cell contains room temperature sputtered transparent conductive electrode (TCE) as the back electrode. It has an n–i–p structure and uses an antireflective coating, an electron transport layer (ETL) made of tin(IV) oxide (SnO2), a perovskite layer, a molybdenum oxide layer (MoOx) and spiro. -OMeTAD hole transport layer (HTL).
The Th MoOx buffer layer protects the perovskite light absorber and charge transfer layers from all sputter damage.
“The ambipolar property of the perovskite light absorber material and the appropriate band alignment with ETL and HTL enable efficient charge transfer towards suitable carrier-selective contacts; hole transport to HTL and electron transport to ETL,” said the academics.
The power conversion efficiency of this state-of-the-art cell technology is 16% on a large area device, measurement 0.805 cm2, and 17.1% in a small–within the precincts of device by measuring 0.175 cm2. The cell was combined with a 23.0% efficient monocrystalline PERC cell in a 4T silicon-perovskite tandem device and achieved an overall efficiency of 26.03%.
“This was made possible by careful optimization of the thickness of the TCE, the rail, the perovskite light absorber layer and the introduction of ARC on both sides,” the researchers explained.
Kabra said the 4T tandem cell can be used as a replacement for glass panels in buildings or for building-integrated photovoltaics (BIPV).