N-methyl-2-pyrrolidone Iodide as Functional Precursor Additive for Record Efficiency 2D Ruddlesden-Popper (PEA)_2(Cs)_(n-1)Pb_nl_(3n+1) Solar Cells

Li Zhizai; Ma Bo; Xu YoukuiLei YutianLan WeiWang GangLi WenquanWang QiangZhang Hao-LiJin Zhiwen

首页> 外文期刊>Advanced functional materials >N-methyl-2-pyrrolidone Iodide as Functional Precursor Additive for Record Efficiency 2D Ruddlesden-Popper (PEA)_2(Cs)_(n-1)Pb_nl_(3n+1) Solar Cells

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N-methyl-2-pyrrolidone Iodide as Functional Precursor Additive for Record Efficiency 2D Ruddlesden-Popper (PEA)_2(Cs)_(n-1)Pb_nl_(3n+1) Solar Cells

机译：N-methyl-2-pyrrolidone Iodide as Functional Precursor Additive for Record Efficiency 2D Ruddlesden-Popper (PEA)_2(Cs)_(n-1)Pb_nl_(3n+1) Solar Cells

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2D perovskite (PEA)(2)(Cs)(n)-1PbnI3n+1 (PEA: phenylethylammonium) exhibits more strengthened phase stability than its 3D components under ambient conditions and hence gained great attention in recent years. However, uncontrollable crystallization kinetics in (PEA)(2)(Cs)(n)-1PbnI3n+1 leads to difficulty in controlling film morphology and phase-orientation regulation, resulting in poor power conversion efficiency (PCE). Herein, by incorporating precursor additive N-methyl-2-pyrrolidone iodide (NMPI), the crystallization rate during the deposition of (PEA)(2)(Cs)(n)-1PbnI3n+1 film is efficiently regulated. As a result, the 2D or quasi-2D perovskite solar cell (PSC) delivers record PCEs in all reported 2D or quasi-2D CsPbX3 families, for instance, the quasi-2D (n = 20) CsPbI3 PSC exhibits a record PCE of 14.59%, showing significantly enhanced stability. Detailed characterization reveals that the NMPI forms hydrogen bonds with dimethylammonium iodide (DMAI) in the precursor to control crystallization rate for a smooth morphology with small fluctuation, which leads to improved carrier lifetime and reduced trap-density. More importantly, femtosecond transient absorption (fs-TA) measurements confirm an improved phase purity and the suppressed nonradiative recombination in quasi-2D perovskite film. It is believed that this simple additive strategy paves a new route for solving phase transition and crystallization kinetic problems in 2D and quasi-2D CsPbX3.

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来源
《Advanced functional materials》 |2021年第52期|2106380.1-2106380.9|共9页
作者
Li Zhizai; Ma Bo; Xu YoukuiLei YutianLan WeiWang GangLi WenquanWang QiangZhang Hao-LiJin Zhiwen;
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作者单位

Qinghai Normal Univ, Sch Phys & Elect Informat Engn, Xining 810008, Qinghai, Peoples R China;

Lanzhou Univ, State Key Lab Appl Organ Chem, Lanzhou 730000, Peoples R China|Lanzhou Univ, Key Lab Special Funct Mat & Struct Design, Lanzhou 730000, Peoples R China|Lanzhou Univ, Coll Chem & Chem Engn, Lanzhou 730000, Peoples R China;

Lanzhou Univ, Sch Phys Sci & Technol, Lanzhou 730000, Peoples R China|Lanzhou Univ, Natl & Local Joint Engn Lab Opt Convers Mat & Tec, Lanzhou 730000, Peoples R ChinaNingbo Univ, Dept Microelect Sci & Engn, Sch Phys Sci & Technol, Ningbo 315211, Peoples R China;

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正文语种英语
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additives; crystallization kinetics; phenylethylammonium; (PEA); (2)(Cs); (n); Pb-1; I-n; (3); (-1); Ruddlesden-Popper;

N-methyl-2-pyrrolidone Iodide as Functional Precursor Additive for Record Efficiency 2D Ruddlesden-Popper (PEA)_2(Cs)_(n-1)Pb_nl_(3n+1) Solar Cells

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