Perovskite Solar Cell Research
Perovskite Solar Cell Research – Spray on Solar Cells – Cheersonic
Human society has a civilization history of 5,000 years, and the development of energy plays an irreplaceable role in this process. The development of world energy has gone through firewood period, coal period and oil period, among which two energy crises broke out. The outbreak of the energy crisis caused people to pay attention to energy and changed the energy structure; the energy crisis made people pay attention to environmental protection and energy conservation, changed the traditional way of life, and advocated low-carbon life; the energy crisis changed the way of mining and utilization of fossil energy, and accelerated the development of new energy. Take advantage of the process.
The future is an era of new energy, especially new energy represented by solar energy, which has the advantages of environmental protection, pollution-free, sustainable, and extensive sources.
In perovskite solar cells, formamidine (FA)-based lead triiodide (FAPbI3 ) of the black α phase. Additives such as methyl ammonium (MA), cesium, bromine, etc. increase the band gap and reduce the thermal stability. A research team improved the stability of α-FAPbI3 with doped dichlorodimethyldiammonium (MDACl2) and obtained a certified short-circuit current density of 26.1 to 26.7 milliamperes per square centimeter. The certified power conversion efficiencies (PCEs) are 23.7%, maintaining more than 90% of the initial efficiency even after 600 hours of operation, where the maximum power point is tracked under full sunlight lighting conditions. Even after heat treatment in air at 150°C for 20 hours, the unencapsulated electronic device still retains more than 90% of the certified energy conversion efficiency and has better thermal and humidity stability.
Compared with other solar cells, perovskite solar cells (PSCs) absorb wider solar light through a narrower bandgap, which improves the power conversion efficiency (PCEs). Among lead halide perovskites (LHPs), lead triiodide (FAPbI3) based on formaldehyde amine (FA) has lower decomposition temperature and higher thermal stability compared with MAPbl (MA is methylammonium), becoming narrowest band gap. The transformation of FAPbI3 from the expected triangular-shaped α-phase to the regular hexagonal-shaped and unexpected wide-bandgap δ-phase is very easy and can be completed at room temperature.
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