基于氟取代苯乙铵盐钝化钙钛矿界面缺陷提升太阳能电池性能的方法研究OA

Perovskite solar cells have become a research hotspot in the field of photovoltaics due to their excel-lent photoelectric properties and advantages of low-temperature solution preparation.However,the problems of non-radiative recombination and ion migration caused by surface and interface defects seriously restrict the im-provement of device performance.In order to solve this key problem,this study innovatively designs and synthe-sizes the para-Fluorophenethylammonium chloride(p-F-PEACl)passivation molecule,and systematically in-vestigates its improvement effect on the performance of p-i-n perovskite solar cells.By means of X-ray diffrac-tion(XRD),photoluminescence(PL),time-resolved photoluminescence(TRPL)and space-charge-limited current(SCLC),this study verifies that the fluorine atom in p-F-PEACl can not only effectively passivate the uncoordinated lead defects through strong Lewis acid-base interaction,and significantly reduces the density of trap states of the film.Meanwhile a physical barrier is formed on the perovskite surface due to its hydrophobici-ty.Based on this"chemical-physical"synergistic passivation mechanism,the optimized device achieves a pho-toelectric conversion efficiency of 22.69％,an open circuit voltage of 1.135 V,a fill factor of 78.97％,and an initial efficiency of more than 90％after 500 h aging test.The results show that the fluorinated molecular design can simultaneously improve the efficiency and stability of perovskite solar cells,which provides a new material design idea for the development of high-performance photovoltaic devices.