Okinawa, Japan science and technology college (OIST) recently successfully developed a new type of inorganic perovskite batteries, is expected to reduce the cost of solar photovoltaic and solve the perovskite battery degradation challenges when it is heated, and at the same time meet the requirements of high efficiency and stability, etc.
As one of the most popular green industry, the solar industry is very competitive, at present, the highest rate of sun for silicon photoelectric cell, but after the Yangtze river waves steady, emerging perovskite batteries are also eyeing up staring at the city of the first throne, its light absorption efficiency is high, the cost is cheaper than silicon battery also, can dissolve in solution, more coating to the substrate, such as solving stability with heated degradation, the future will be immeasurably.
According to the Advanced Energy Materials research, is different from the past organic perovskite cells, the team developed a new type of battery for inorganic, this is a major change, because organic material is usually not heat-resisting, when it is heated to a recession.
Solar cells become very hot after long time exposure to sunlight, resulting in a decline in light conversion efficiency and therefore material thermal stability in solar photovoltaic research and development of the key position, researchers, borrows by inorganic instead of organic material, let the perovskite solar cells is more stable.The photoelectric conversion efficiency (PCE) is down only 8 per cent after 300 hours of exposure to solar cells from the inorganic perovskite solar cells, according to the OIST's ministry of energy materials and surface science.
But all inorganic perovskite light absorption efficiency of solar cells than organic inorganic composite materials is low, so the researchers used manganese to improve the performance of battery by manganese material changing crystal structure, and further improve the ability to capture the light.Liu said that as we use salt to taste, when the team adds manganese to the battery, it can change the characteristics of solar cells.
In order to prevent the deterioration of batteries due to heat, the new inorganic perovskite electrode replaces the old gold with carbon.The electrodes are significantly cheaper and easier to produce than gold materials that require high temperatures and vacuum conditions, and carbon can be printed directly on solar cells.
New inorganic perovskite cell is composed of multilayer materials, for only a few millimeters thick at the bottom of the glass, the second layer of transparent conductive material FTO, upper part is composed of titanium dioxide electronic active layer with photosensitivity photoactive perovskite, the top is carbon.
Currently, the team continues to study the efficiency and durability of the new battery, and hopes to increase the conversion efficiency from 6.14% to commercialization in the future.In light of perovskite battery photoelectric conversion efficiency has risen from 3.81% in 2009, to 22% can match with silicon battery, great progress in such a short time, this kind of battery application and development was favored.