Vertically Aligned 2D/3D Pb-Sn Perovskites with Enhanced Charge Extraction and Suppressed Phase Segregation for Efficient Printable Solar Cells

被引：123

作者：

Li, Chaohui ^{[1
,2
]}

Pan, Yamin ^{[1
]}

Hu, Jinlong ^{[2
]}

Qiu, Shudi ^{[2
]}

Zhang, Cuiling ^{[2
]}

Yang, Yuzhao ^{[2
]}

Chen, Shi ^{[3
]}

Liu, Xianhu ^{[1
]}

Brabec, Christoph J. ^{[4
]}

Nazeeruddin, Mohammad Khaja ^{[5
]}

Mai, Yaohua ^{[2
]}

Guo, Fei ^{[2
]}

机构：

[1] Zhengzhou Univ, Coll Mat Sci & Engn, Natl Engn Res Ctr Adv Polymer Proc Technol, Zhengzhou 450002, Peoples R China

[2] Jinan Univ, Inst New Energy Technol, Coll Informat Sci & Technol, Guangzhou 510632, Peoples R China

[3] Southern Univ Sci & Technol, Dept Mat Sci & Engn, Shenzhen 518055, Guangdong, Peoples R China

[4] Friedrich Alexander Univ Erlangen Nurnberg, Inst Mat Elect & Energy Technol & Meet, D-91058 Erlangen, Germany

[5] Ecole Polytech Fed Lausanne Valais Wallis, Grp Mol Engn Funct Mat, Inst Chem Sci & Engn, CH-1951 Sion, Switzerland

来源：

ACS ENERGY LETTERS | 2020年 / 5卷 / 05期

基金：

中国国家自然科学基金;

关键词：

SEPARATION;

D O I：

10.1021/acsenergylett.0c00634

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The concept of mixed 2D/3D heterostructures has emerged as an effective method for improving the stability of lead halide perovskite solar cells, which has been, however, rarely reported in lead-tin (Pb-Sn) mixed perovskite devices. Here, we report a scalable process for depositing mixed 2D/3D Pb-Sn perovskite solar cells that deliver remarkably enhanced efficiency and stability compared to their 3D counterparts. The incorporation of a small amount (3.75%) of an organic cation 2-(4-fluorophenyl)ethylammonium iodide induces the growth of highly oriented Pb-Sn perovskite crystals perpendicularly aligned with the substrate. Moreover, for the first time, phase segregation is observed in pristine 3D Pb-Sn perovskites, which is suppressed due to the presence of the 2D perovskites. Accordingly, a high current density of 28.42 mA cm(-2) is obtained due to the markedly enhanced spectral response and charge extraction. Eventually, mixed 2D/3D Pb-Sn perovskite devices with a band gap of 1.33 eV yield efficiencies as high as 17.51% and in parallel exhibit good stability.

引用

页码：1386 / 1395

页数：10

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