A reaction-and-assembly approach using monoamine zinc porphyrin for highly stable large-area perovskite solar cells  

作　　者：Xiaochen Li Chunling Li Yiying Wu Jing Cao Yu Tang 

机构地区：[1]State Key Laboratory of Applied Organic Chemistry,Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province,College of Chemistry and Chemical Engineering,Lanzhou University,Lanzhou 730000,China [2]Department of Chemistry and Biochemistry,The Ohio State University,Columbus,Ohio 43210,USA

出　　处：《Science China Chemistry》2020年第6期777-784,共8页中国科学（化学英文版）

基　　金：supported by the National Natural Science Foundation of China(21801104,21871121,21431002);the Young Elite Scientists Sponsorship Program by China Association for Science and Technology(2018QNRC001);the Fundamental Research Funds for the Central Universities of China(lzujbky-2019-sp01,lzujbky-2019-kb12);the Special Fund Project of Guiding Scientific and Technological Innovation Development of Gansu Province(2019ZX-04);support by the US Department of Energy(DE-FG02-07ER46427);support of Gansu Computing Center of China。

摘　　要：Inhibiting the irreversible escape of organic cations and iodide species in perovskite films is crucial for the fabrication of efficient and stable perovskite solar cells(PSCs).Here,we develop a reaction-and-assembly approach using monoamine zinc porphyrin(ZnP)to modify methylammonium(MA^+)lead iodide perovskite film.The amine group in ZnP reacts with MA^+and I^-ions to yield monoammonium zinc porphyrin(ZnP-H+I-).The resultant films show no escape of iodide when immersed in ether solutions.Measurements from space-charge limited currents and transient photoluminescence indicate the modified films have reduced density of defects.These results suggest the formed ZnP-H^+I^-is bound on the surface and grain boundary of perovskite film to retard migrations of ions.DFT calculations also show that the energy alignment between ZnP-H^+and perovskite facilitates the electron transfer and reduces charge recombination at the perovskite grains.Furthermore,post-treating the Zn Pdoped film with ZnP again results in the formation of a one dimension zig-zag coordination polymer on the surface of the perovskite film.The single crystal structure of ZnP shows the polymer layer is formed through the coordination interaction between the Zn(II)metal center and a neighboring monoamine.The polymer facilitates the interfacial charge transfer,and reduces the escape of organic cations and iodide species in perovskite films,thereby keeping the excellent cell performance(20.0%)and further realizing the ion encapsulation.Finally,the modified PSCs retain over 90%of its original efficiency over2,000 h at 85°C or AM 1.5 G continuous illumination,or over 6,000 h in 45%humidity without encapsulation.This work affords a new strategy to achieve the efficient ions immobilization and encapsulation by in situ reaction and coordination assembly of mono-amine zinc porphyrin.

关 键 词：ions immobilization reaction-and-assembly monoamine porphyrin perovskite solar cells 

分 类 号：TM914.4[电气工程—电力电子与电力传动]