A team of researchers from two Chinese universities achieved a bifacial factor of 99.1% with a semi-transparent organic cell, the highest reported bifacial factor to date in such cells. The cell also achieved an energy conversion efficiency of 12.5% and an average visible light transmission of 22.9%.
A team of researchers has fabricated a semi-transparent organic solar cell with a bifaciality factor of 99.1%, the highest reported to date in semi-transparent organic cells.
Professor Wenchao Huang, one of the lead authors of the report, said pv magazine The researchers’ semi-transparent organic cell exhibits similar photovoltaic performance when illuminated from the bottom and top and exhibits excellent energy conversion efficiency under low light intensity or low light angle conditions.
The research team from Wuhan University of Technology and Central South University, Changsha, developed the semi-transparent organic cell based on silver nanowires (AgNWs) top electrodes with a double-layer electron transport layer containing zinc oxide nanoparticles (ZnO) and PDINN, a cathode interlayer , combined. , to improve the interface between the active layer and the top electrode.
Semi-transparent organic solar cells have attracted interest due to their high transmittance and high electrical conductivity, but the research report says that the deposition of AgNWs typically damages the underlying electron transport layer, leading to poor interfacial performance.
In the research paper “A semi-transparent organic solar cell with a bifacial factor of 99.1%,” published in Materials today energythe team explains that the additional PDINN in their fabricated cell can fill surface defects in ZnO, which “prevents possible contact between AgNWs and the active layer while facilitating electron extraction.”
The device achieved an energy conversion efficiency (PCE) of 12.5%, which the paper calls “remarkable,” and an average visible light transmission of 22.9%. By adjusting the acceptor-donor ratio and the concentration of the active layer, the cell was also found to achieve the highest light utilization efficiency of 4.0% with a PCE of 9.5%.
The research paper concludes that the cell provides a “simple solution for fabricating high-performance semi-transparent organic cells based on AgNWs top electrodes.” “The colorful tunability and excellent bifacial photovoltaic behavior of our developed bifacial semi-transparent organic solar cells is a promising candidate for BIPV (building integrated photovoltaic applications,” said Huang.
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