 |
Recently, Liu Shengzhong, a researcher of the silicon-based solar cell research group (DNL1606) of the Department of Solar Energy Research of the Clean Energy National Laboratory of the Dalian Institute of Chemical Physics, Chinese Academy of Sciences, led his team to use the temperature-increasing crystallization method to prepare a super-sized monocrystalline perovskite CH3NH3PbI3 crystal for the first time. Dimensions in excess of 2 inches (greater than 71mm). This is the world's first reported perovskite crystal with a size of more than 0.5 inches. The relevant results are published online in the journal Advanced Materials (Adv. Mater. 2015, 27(35), 5176-5183.doi:10.1002/adma.201502597). The journal editor highly praised the article and wrote a bright comment. The comment has been published online on the MaterialsViews website.
The methylamino-halogenated lead halide material having a perovskite crystal structure has excellent properties such as a high light absorption coefficient, a very long carrier transport distance, and a very low density of defect states, and thus becomes an excellent photovoltaic material, a laser material, and Luminescent material. At present, the photoelectric conversion efficiency of NREL certified perovskite solar cells has reached 20.1%, which is close to the efficiency of monocrystalline silicon solar cells. At the same time, laser and light-emitting devices based on perovskite materials have been successfully developed, showing the broad application prospects of perovskite materials in the field of optoelectronics. However, perovskite solar cells and other optoelectronic devices based on microcrystalline or amorphous thin films still face enormous challenges.
There are many crystal grains, grain boundaries, pores and surface defects in the microcrystalline perovskite film that can cause carrier recombination, which is a key issue that needs to be solved to further improve the solar energy conversion efficiency and other optoelectronic device performance. Based on this, the research group developed a method for growing large-size perovskite single crystals and successfully produced single-crystal crystals with a size of more than 70 mm.
Through high-resolution XRD, optical tests conducted at room temperature, it was found that the CH3NH3PbX (X = Cl, Br, I) perovskite crystal material has a very high crystalline quality and a better light absorption range (compared to a thin film sample), The luminescence peak of CH3NH3PbI3 at 402 nm was found for the first time. Further TGA and DSC characterization results show that the CH3NH3PbI3 crystal has higher thermal stability than the thin film material. The above research results show that this oversized single crystal CH3NH3PbX3 (X = Cl, Br, I) has great potential in the development of high-performance optoelectronic devices.
The research was funded by the Central University Fund, the Yangtze River Scholars and the Innovation Team's "111 Plan" and "Thousand People Plan" projects.
Central Motors,Ce Central Motor,Central Shutter Door Motor,Central Motor For Automatic Door
Zhejiang Huzhou SCVE Machine & Motor Co., Ltd. , https://www.scve-motor.com