MAPbBr_(3)@ZIF-67的制备及光电性能研究

Synthesis of MAPbBr_(3)@ZIF-67 and Investigations of Their Photo-electrical Properties

有机-无机杂化钙钛矿是一种重要的光电材料,广泛应用于光伏器件中,将其限域在MOFs中可以显著提高其稳定性,但是对其光电探测器性能的影响还不清楚。本文使用典型的MOFs材料ZIF-67对典型的钙钛矿材料MAPbBr_(3) 进行限域,制备了MAPbBr_(3) @ZIF-67复合材料,并且通过调节加入ZIF-67量,形成不同浓度的MAPbBr_(3) @ZIF-67复合钙钛矿。研究发现,加入ZIF-67,不会影响MAPbBr_(3) 的晶格结构和吸收边位置,但能够提高其结晶性。此外,由于ZIF-67在波长大于550 nm范围仍有明显的吸收,复合材料也在该波长范围展示出了显著的吸收特性。在应用到光电探测器后,器件的开关比提高了一个数量级。该研究为进一步提升器件的响应性能提供了新思路。

Organic-inorganic hybrid perovskite is an important photoelectric material,which is widely used in photovoltaic devices.And their stability will significantly improve when sample limited in MOFs,however,the effect of limitation on its photodetector performance is still under investigation.In this study,MAPbBr_(3) were limited in ZIF-67,a typical MOFs material,and by adjusting the amount of ZIF-67,MAPbBr_(3)@ZIF-67 with different concentrations ZIF-67 was formed.It was found that the addition of ZIF-67 did not affect the lattice structure and absorption edge position of MAPbBr_(3),but could improve its crystallinity.In addition,since ZIF-67 still has significant absorption at wavelengths longer than 550 nm,the composite also shows significant absorption characteristics in this wavelength range.When the synthesized sample used in photodetector,the corresponding switching ratio of the device is improved more than an order of magnitude.This study provides a new idea for further improving the response performance of the device.