South Korea to develop efficient, low-cost perovskite solar cells use lead-free materials

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as low cost, high efficiency solar cell material, in the lead of perovskite has attracted much attention. However, lead ( Pb) For its inherent instability and toxicity of lead-based perovskite as solar battery materials feasibility of serious concern, hindered the solar cells and based on these materials mass commercialization of similar devices.

phoenix TV reported that a recent by ulsan university of science and technology ( UNIST) Natural sciences professor airport - Hyuk Kwon led, in the aspect of developing a new generation of solar cells is an important step, this study adopts lead-free perovskite. This new type of perovskite materials have good electrical performance, can be used as a dye sensitization solar battery charge regenerator, thereby improving overall efficiency and stability of the battery.

the study was published in November 2018, journal of advanced materials ( 先进材料) , the findings will be lead-free perovskite application in solar cells opens up new possibilities.

in the various alternatives of lead, the research team used a blank order double perovskite ( Cs2SnI6) 。 Although promising, Cs2SnI6 surface state and its function is still not clear. Therefore, it is necessary to fully studied the characteristics of Cs2SnI6, for the future based on Cs2SnI6 provide reference for the design of the device.

to clarify Cs2SnI6 surface state function, the team studied the charge transfer mechanism, and therefore has developed a three electrode system, surface state of the charge transfer of Cs2SnI6 observation. In addition, cyclic voltammetry and mulder - Schottky ( 莫特- 肖特基) Analysis has also been used to detect Cs2SnI6 surface state, found that the electric potential to the band gap.

analysis showed that Cs2SnI6 surface state has the very high REDOX activity, in the presence of iodine REDOX medium can effectively charging/discharging. In addition, the preparation of charge regeneration system based on Cs2SnI6 confirmed the charge transfer takes place through Cs2SnI6 surface state.

ulsan university of science and technology researchers HyeonOh Shin, points out that the study found that the charge transfer through Cs2SnI6 surface state, this will help to use unleaded perovskite materials design electronic and energy equipment in the future.

based on this strategy, the team used a used in organic dye sensitized solar cell ( DSSCs) Based on Cs2SnI6 charge regenerator, designed a hybrid solar cells. This kind of solar cells in the process of oxidation of organic dye restorable generate an electric current.

the study of another major founder Byung - Man, Kim also pointed out that due to a large amount of electric charge in the organic dye and Cs2SnI6 surface state has high connectivity, so the more current. So, Cs2SnI6 on thermodynamics has good charge acceptance level, compared with the conventional liquid electrolyte, the current density increased by 79%.

this study based on the research of the Cs2SnI6 charge transfer mechanism, clarify the function of its surface state, caused wide attention in the research. The study results show that in the presence of REDOX medium, Cs2SnI6 surface state are the main charge transfer way, in the future based on Cs2SnI6 device should be taken into consideration in the design of the way.