More Efficiency For Solar Cell
Author: Source: Datetime: 2016-10-15 14:11:32
Perovskite solar cell is a perovskite structure of the organic - metal halide as the core of light absorption, photoelectric conversion, photogenerated carrier transport material of solar powered portable generator cells. The battery not only has high energy conversion efficiency, and its core photoelectric conversion material with cheap, easy to prepare features, which for its large-scale, low-cost manufacturing possible.
In recent years, metal-organic perovskite materials have been widely used in the construction of high-efficiency, low-cost solar cells and other optoelectronic devices and become an important research hotspot material in the world. The superior performance of such materials in a variety of devices is due to their unique photophysical properties, such as high carrier lifetime, high charge mobility and long migration distance.
So far, based on this material solar cell photoelectric conversion efficiency has reached 22.1%, but compared with the theoretical value there is still much room for improvement. In the conventional perovskite thin films prepared by liquid and vapor deposition methods, the surface morphology of the films such as crystal size, crystal block shape and crystal block boundary are very different, which hinders the further development of the critical properties of materials improve.
Previous studies generally agreed that the heterogeneity of the microstructure of the perovskite film has a significant negative effect on the photoelectric properties of the film. However, the mechanism is not clear. Therefore, to explore the perovskite thin film heterogeneity on the carrier life, mobility and battery performance, can further improve the efficiency of solar cells.
Recently, the Jinshengye team has successfully implemented the time-resolved fluorescence scanning imaging system on the sub-micron spatial scale to achieve the carrier lifetime of the micro-region, the carrier diffusion coefficient between the grains and the grains, Direct carrier measurement of carrier transport distance and carrier extraction efficiency. It is found that in the high quality perovskite CH3NH3PbI3 (Cl) polycrystalline thin film, the internal carrier diffusion rate is very fast, which is close to the bulk perovskite single crystal material. While the carrier lifetime is long and the distribution between grains of different sizes and shapes is very uniform. However, when the surface of the perovskite thin film is loaded with electrons and hole transport layers, the carrier extraction efficiency at the surface of the crystal grains is large due to the defects existing at the perovskite and electron (hole) acceptor interfaces This is likely to be a key factor in limiting the efficiency of the solar power batteries, so improving the uniformity of the interface between the grain and the electron (hole) acceptor in the perovskite thin film is an important direction to improve the efficiency of the solar cell. The results provide a new way to further improve the efficiency of perovskite solar cells.
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