Researchers at South Korea’s Ulsan National Institute of Science and Technology (UNIST) have developed a perovskite solar cell by using alkylammonium chloride (RACI) to control the formation of defects in the perovskite layer.
“Alkylammonium chloride, which is dequantized at the crystallization stage while combining with perovskite components, was used,” said researcher Sang Il Seok. “This optimal combination with Alkyl was also able to optimally control the rate of volatilization with solvent during coating and heat treatment of perovskite precursor solution.”
The scientists built the cell with a metal halide perovskite known as formamidinium lead iodide (FAPbI3), which offers superior thermal stability and a narrow bandgap. The new process enables the creation of a dense perovskite film with good crystallinity, they claimed. They investigated the surface morphology of the film via grazing incident wide-angle X-ray diffraction and scanning electron microscopy.
“RACl added to the precursor solution was believed to be easily volatilized during coating and annealing,” they explained.
They tested the film in a perovskite cell and found that it achieved a power conversion efficiency of 26.08%, an open-circuit voltage of 1.18 V, a short-circuit current of 25.7 mA/cm2, and a fill factor of 86.15%. When tested by NREL experts, the device achieved a certified efficiency of 25.73%.
The researchers presented the cell tech in “Controlled growth of perovskite layers with volatile alkylammonium chlorides,” which was recently published in Nature.
“This study is very meaningful, as it examines the crystallization process of perovskite with halide anions in real time through the UNIST-PAL Beamline of Pohang Accelerator Laboratory,” said researcher Tae Joo Shin.
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Source: pv magazine