摘要
Over the years,the efficiency of inorganic perovskite solar cells(PSCs)has increased at an unprecedented pace.However,energy loss in the device has limited a further increase in efficiency and commercialization.In this work,we used(NH4)2C2O4·H2O to treat CsPbBrI2 perovskite film during spin-coating.The CsPbBrI2 underwent secondary crystallization to form high quality films with micrometer-scale and low trap density.(NH4)2C2O4·H2O treatment promoted charge transfer capacity and reduced the ideal factor.It also dropped the energy loss from 0.80 to 0.64 eV.The resulting device delivered a power conversion efficiency(PCE)of 16.55%with an open-circuit voltage(Voc)of 1.24 V,which are largely improved compared with the reference device which exhibited a PCE of 13.27%and a Voc of 1.10 V.In addition,the optimized treated device presented a record indoor PCE of 28.48%under a fluorescent lamp of 1000 lux,better than that of the reference device(19.05%).
全无机钙钛矿太阳电池在最近几年取得突飞猛进的进展,但较大的能量损失限制了其性能的进一步提升.本文对完成退火处理的CsPbBrI2薄膜使用旋滴的方法再次加入(NH4)2C2O4·H2O溶液,并进行二次退火处理,成功制备出具有微米级晶粒尺寸和低缺陷态浓度特征的钙钛矿薄膜,有效改善了薄膜中的载流子输运动力学过程,并减小了其理想因子.而且用这种方法制备的全无机钙钛矿太阳电池的能量损失仅为0.64 eV.相比之下,未处理薄膜制备出的器件能量损失高达0.80 eV.此外,处理后薄膜制备的器件在标准太阳光下的光电转换效率达到了16.55%(对应开路电压1.24 V),远高于参考器件的13.27%(开路电压仅为1.10 V).同时,处理后的器件在弱光条件下展示出出色的光电性能:在强度为1000 lux的荧光灯下获得了28.48%的光电转换效率(参考器件仅为19.05%).
作者
Kai-Li Wang
Xiao-Mei Li
Yan-Hui Lou
Meng Li
Zhao-Kui Wang
王凯礼;李小梅;娄艳辉;李萌;王照奎(Institute of Functional Nano&Soft Materials(FUNSOM),Jiangsu Key Laboratory for Carbon-Based Functional Materials&/Devices,Soochow University,Suzhou 215123,China;College of Physics,Soochow Institute for Energy and Materials Innovations.Soochow University.Suzhou 215006,China)
基金
financial support from the National Key R&D Program of China(2016YFA0202400)
the National Natural Science Foundation of China(61674109)
the Natural Science Foundation of Jiangsu Province(BK20170059)
funded by the Collaborative Innovation Center of Suzhou Nano Science and Technology
the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD)
the “111”Project of The State Administration of Foreign Experts Affairs of China
the Open Fund of the State Key Laboratory of Integrated Optoelectronics(IOSKL2018KF07)。
