卤化物
钙钛矿(结构)
碘化物
钝化
溴化物
异质结
无机化学
成核
化学
基质(水族馆)
材料科学
氯化物
化学工程
结晶学
纳米技术
光电子学
有机化学
海洋学
图层(电子)
地质学
作者
Xueping Liu,Thomas Webb,Linjie Dai,Kangyu Ji,Joel A. Smith,Rachel C. Kilbride,Mozhgan Yavari,J.X. Bi,Aobo Ren,Yuanyuan Huang,Zhuo Wang,Yonglong Shen,Guosheng Shao,Stephen J. Sweeney,Steven J. Hinder,Hui Li,David G. Lidzey,Samuel D. Stranks,Neil C. Greenham,S. Ravi P. Silva,Wei Zhang
出处
期刊:Energy & environmental materials
日期:2022-03-30
卷期号:5 (2): 670-682
被引量:8
摘要
Recent advances in heterojunction and interfacial engineering of perovskite solar cells (PSCs) have enabled great progress in developing highly efficient and stable devices. Nevertheless, the effect of halide choice on the formation mechanism, crystallography, and photoelectric properties of the low‐dimensional phase still requires further detailed study. In this work, we present key insights into the significance of halide choice when designing passivation strategies comprising large organic spacer salts, clarifying the effect of anions on the formation of quasi‐2D/3D heterojunctions. To demonstrate the importance of halide influences, we employ novel neo‐pentylammonium halide salts with different halide anions (neoPAX, X=I, Br, or Cl). We find that regardless of halide selection, iodide‐based (neoPA) 2 (FA) ( n ‐1) Pb n I (3 n +1) phases are formed above the perovskite substrate, while the added halide anions diffuse and passivate the perovskite bulk. In addition, we also find the halide choice has an influence on the degree of dimensionality ( n ). Comparing the three halides, we find that chloride‐based salts exhibit superior crystallographic, enhanced carrier transport, and extraction compared to the iodide and bromide analogs. As a result, we report high power conversion efficiency in quasi‐2D/3D PSCs, which are optimal when using chloride salts, reaching up to 23.35%, and improving long‐term stability.