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New research from India has shown that bifacial perovskite solar cells can achieve 2% higher power conversion efficiency at a tilt angle of 20 degrees. The scientists have also developed a bifacial perovskite solar cell for applications in tandem or single-junction photovoltaic devices.
Researchers at the Indian Institute of Technology Bombay have performed a quantitative analysis of the optimal albedo and tilt angle values ??in bifacial perovskite solar cells and found that increasing the back-face albedo to 0.5 and using a tilt angle of 20 degrees yields the highest efficiency levels.
“Our study presents the fabrication of efficient bifacial perovskite solar cells and investigates their unique properties using various characterization techniques, including Lambertian reflection effects via tilt angle arrangements and lower albedo illuminations,” lead author of the research Paul Ananta told pv magazine .
According to the scientists, the core component of their bifacial solar cells is the transparent back contact made of indium zinc oxide (IZO), which they claim has excellent conductivity, high mobility and optimum transparency. The device has an active surface area of ??0.175 cm2 when illuminated from the front and 0.14 cm2 when illuminated from behind.
The cell was designed with a transparent fluorine-doped tin oxide (FTO) substrate, a tin oxide (SnO2) electron transport layer (ETL), a perovskite absorber, a hole transport layer (HTL) based on spiro-OMeTAD and molybdenum oxide (MoOx), the IZO layer and a molybdenum oxide (MoOx).
“The driver achieved a maximum power conversion efficiency of 17.46% under 1 Sun AM1.5G front illumination,” Ananta explained. “A significant influence of the ground Lambertian reflection is observed with variations in the tilt angle, resulting in an increase in efficiency from 17.46% to 18.82% as the tilt angle reaches 20 degrees.”
Furthermore, the researchers found that increasing the back-face albedo to 0.5 Sol resulted in a maximum efficiency of 26% with a bifaciality factor of 89.3% at a tilt angle of 20 degrees.
“Consequently, the synergistic effect of 0.5 Sun albedo and 20 degree light angle tilt enabled the development of bifacial perovskite solar cells with 26.46% efficiency,” Ananta continued. “SCAPS-1D simulations are further used to validate the experimental Lambertian reflection effects.”
The researchers also found that the cells exhibited intrinsic self-encapsulation and chemical robustness. “Our study anticipates that, in the near future, cost-effective and highly efficient bifacial perovskite solar cells will become a leading photovoltaic technology, both in single and tandem junction configurations, for electricity generation,” they conclude.
Their findings are published in the paper, “ Quantitative Estimation of Albedo and Tilt Angle Variation in Bifacial Perovskite Solar Cells,” recently published in ACS Applied Materials & Interfaces . |
