阳极界面修饰对钙钛矿太阳能电池性能的影响

采用在聚(3,4-乙撑二氧噻吩)∶聚苯乙烯磺酸(Poly(3,4-ethylenedioxythiophene)∶Poly(styrenesulfonate),PEDOT∶PSS)阳极界面层上直接旋涂二甲基亚砜(Dimethyl Sulfoxide,DMSO)的方法,对PEDOT∶PSS薄膜进行修饰,以提高所制得的钙钛矿太阳能电池器件性能.在5000rpm转速条件下旋涂DMSO后,器件的能量转换效率达到11.43%,与PEDOT∶PSS阳极界面层未做任何修饰的器件相比,效率提高了29.15%.测试表征了修饰前后PEDOT∶PSS薄膜的透光性、表面形貌、电导率、器件的外量子效率曲线以及器件在光照和暗态下的J-V特性曲线,分析了器件性能提高的原因.结果表明:经过修饰的PEDOT∶PSS薄膜导电性显著增强,从而更加有利于器件阳极对空穴的抽取和收集;较未修饰时,器件的短路电流密度得到了大幅度提升,进而使得器件获得更高的能量转换效率.

Influence of Anode Interface Modification on the Performance of Perovskite Solar Cells

The Poly (3,4-ethylenedioxythiophene) ∶ Poly (styrenesulfonate) (PEDOT ∶ PSS) films modified by the method of Dimethyl Sulfoxide (DMSO) was directly spin-coated on the PEDOT ∶ PSS anode interface layer,whieh made the performance of perovskite solar cells device has been greatly improved.Under the DMSO spin-coating speed of 5000 rpm,the power conversion efficiency of the device has reached up to 11.43 ％,which increases 29.15 ％ compared with the device with an unmodified PEDOT ∶ PSS anode interface layer.The transmission spectra,surface morphology,conductivity of the PEDOT ∶ PSS films before and after modification were tested,and the external quantum efficiency curve and the J-V characteristic curve under illumination and dark were also tested to reveal the origin of the improvement of the device performance.The results show that,the conductivity of the modified PEDOT ∶ PSS film has been improved significantly,and thus the anode of the device can more efficiently extract and collect the charge carriers of holes.Compared with the device with unmodified PEDOT ∶ PSS,the short circuit current density of the modified device has been enlarged significantly that accounts for the higher power conversion efficiency.