Controllable blading interdiffusion of formamidinium iodide on thermal evaporated scalable and conformal lead iodide for efficient perovskite solar cells

Fang，Jun; Lin，Dongxu; Huang，Weixin; Wang，Xin; Li，Huan; Li，Sibo; Xie，Guanshui; Wang，Daozeng; Qiu，Longbin

2023-09-10

10.1016/j.jallcom.2023.170255

Journal of Alloys and Compounds   影响因子和分区

0925-8388

1873-4669

Organic-inorganic perovskite solar cells with a rapid improving performance have attracted a broad interest, which are mainly fabricated by either one step antisolvent or sequential two-step spin coating process. The sequential two-step coating process has a fine controllability by separating the deposition of PbI and organic salt like formamidinium iodide. However, the spin coating has issues such as the use of toxic solvents, a high solution waste ratio and is not suitable for large-area and textured surface. The developed sequential two-step process combining the thermal evaporation of scalable and conformal PbI and a blading process of organic salt is expected for the formation of high-quality perovskite with a high uniformity and conformability. However, the device performance is inferior to the two-step solution coating process. Here we systematically investigated the structure and morphology difference of the PbI that deposited by solution coating process and thermal evaporation process, and its effect on perovskite layer quality and device performance. The spin coated solvent coordinated PbI formed a porous structure, which is beneficial for organic salt penetration. In contrast, evaporated PbI is compact with a smooth surface, and may lead to unwanted 2D structures or un-completed conversion when reacted with organic ammonium salt. A temperature-assisted crystal growth is developed to modulate the crystal growth and a superior perovskite film morphology was obtained from thermal evaporated PbI. Consequently, a champion efficiency of 19.8 % was realized, which is among the highest values for perovskite solar cells prepared by sequential two-step process with thermal evaporation of PbI and blading of organic salts.

Blade coating Perovskite solar cells Thermal assisted crystal growth Thermal evaporation Two-step sequential coating

SCI ; EI

英语

第一 ; 通讯

National Natural Science Foundation of China[22109067];

Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering

Chemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering

WOS:000990886600001

ELSEVIER SCIENCE SA

20231814048795

Coatings ; Film growth ; Iodine compounds ; Layered semiconductors ; Lead compounds ; Morphology ; Perovskite ; Perovskite solar cells ; Salts ; Textures ; Thermal evaporation

Minerals:482.2 ; Solar Cells:702.3 ; Semiconducting Materials:712.1 ; Coating Materials:813.2 ; Physical Properties of Gases, Liquids and Solids:931.2 ; Crystal Growth:933.1.2 ; Materials Science:951

MATERIALS SCIENCE

2-s2.0-85154579390

Scopus

SUSTech Energy Institute for Carbon Neutrality,Department of Mechanical and Energy Engineering,Southern University of Science and Technology,Shenzhen,518055,China

Fang，Jun,Lin，Dongxu,Huang，Weixin,et al. Controllable blading interdiffusion of formamidinium iodide on thermal evaporated scalable and conformal lead iodide for efficient perovskite solar cells[J]. Journal of Alloys and Compounds,2023,955.

Fang，Jun.,Lin，Dongxu.,Huang，Weixin.,Wang，Xin.,Li，Huan.,...&Qiu，Longbin.(2023).Controllable blading interdiffusion of formamidinium iodide on thermal evaporated scalable and conformal lead iodide for efficient perovskite solar cells.Journal of Alloys and Compounds,955.

Fang，Jun,et al."Controllable blading interdiffusion of formamidinium iodide on thermal evaporated scalable and conformal lead iodide for efficient perovskite solar cells".Journal of Alloys and Compounds 955(2023).