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Polarized ferroelectric polymer applied to high-efficiency perovskite solar cells

2019-06-28 来源:转载自第三方
High-performance perovskite solar cells are one of the research directions of Professor Liao Liangsheng and Professor Wang Zhaokui of Suzhou University. In recent years, based on previous experience in organic optoelectronic devices and materials research, the research group has developed a key issue around the interface of organic/inorganic hybrid perovskite solar cells, the crystallization of perovskite films, and the toxicity of lead. A series of high-efficiency and stable hole and electron transport materials have developed a variety of new methods for crystallization control of perovskite films based on interface modification (water additive, interface induced crystallization, hot hinge fullerene doping, electric field-assisted crystallization, two-dimensional material passivation, flexible devices, etc., by doping non-lead metal elements to control the crystallization of perovskite films and achieve multiple purposes such as reducing lead usage.
In recent years, organic-inorganic hybrid metal halide perovskites have attracted attention due to their excellent photoelectric properties. However, for a photovoltaic device, the energy loss (Eloss) caused by the non-radiative recombination inside the optical transport layer and the transport layer interface is unavoidable. Minimizing Eloss is an effective way to regulate the performance of solar cells. In general, the separation and transport efficiency of carriers is mainly affected by the built-in electric field (BIF) inside the device, which is the main driving force for guiding carriers to drift to the two electrodes. If the BIF is not large enough, the carriers are not easily separated, and again, even if they are separated, they are easily caught by the trap state, thereby causing a large Eloss.
Recently, Professor Liao Liangsheng, Professor Wang Zhaokui from Suzhou University and Professor Yang Yang from the University of California, Los Angeles (UCLA) used ferroelectric polymer (PFE) containing F to effectively improve the calcium and titanium through the simultaneous doping and interface dipole action. Photovoltaic performance of mine solar cells. The researchers found that PFE is doped into the MAPbI3 light-transporting layer film, which not only interacts with MAPbI3 crystals by hydrogen bonding, but also uses its strong polarization properties to guide the more orderly growth of perovskite crystals. This polarization also provides additional potential to enhance the BIF regulation depletion region, thereby increasing carrier separation efficiency. On this basis, a thin interface dipole PFE film is sandwiched between the light absorbing layer and the transport layer, which can effectively reduce the interface barrier caused by interface lattice mismatch and surface defects, and the interface dipole It is more efficient to provide additional potential to the device's BIF to make the interface levels more closely matched. Combining the two optimized processes, the device's BIF can be significantly improved, effectively reducing Eloss and increasing the device's open circuit voltage (Voc) to 1.14 V. At the same time, the performance of different ferroelectric polymers was compared. Finally, the device efficiency of ferroelectric polymer P (VDF-TrFE) was as high as 21.38%. This work provides a new idea for the preparation of high-efficiency solar cells with low energy losses.