Crystal Orientation Drives the Interface Physics at Two/Three-Dimensional Hybrid Perovskites

被引：48

作者：

Bouduban, Marine E. F. ^{[1
]}

Queloz, Valentin I. E. ^{[2
]}

Caselli, Valentina M. ^{[3
]}

Cho, Kyung Taek ^{[2
]}

Kirmani, Ahmad R. ^{[4
]}

Paek, Sanghyun ^{[2
]}

Roldan-Carmona, Cristina ^{[2
]}

Richter, Lee J. ^{[4
]}

Moser, Jacques E. ^{[1
]}

Savenije, Tom J. ^{[3
]}

Nazeeruddin, Mohammad Khaja ^{[2
]}

Grancini, Giulia ^{[2
,5
]}

机构：

[1] Ecole Polytech Fed Lausanne, Inst Chem Sci & Engn, Photochem Dynam Grp, Stn 6, CH-1015 Lausanne, Switzerland

[2] EPFL, Inst Chem Sci & Engn, Grp Mol Engn Funct Mat, Rue Ind 17, CH-1951 Sion, Switzerland

[3] Delft Univ Technol, Dept Chem Engn, Van der Maasweg 9, NL-2629 HZ Delft, Netherlands

[4] NIST, Mat Measurement Lab, Gaithersburg, MD 20899 USA

[5] Univ Pavia, Dept Chem Phys Chem, Via Torquato Taramelli 14, I-27100 Pavia, Italy

来源：

JOURNAL OF PHYSICAL CHEMISTRY LETTERS | 2019年 / 10卷 / 19期

基金：

瑞士国家科学基金会;

关键词：

CHARGE-CARRIERS; HALIDE; NANOCRYSTALS; MOBILITIES; EFFICIENT;

D O I：

10.1021/acs.jpclett.9b02224

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：

Combining halide perovskites with tailored dimensionality into two/three-dimensional (2D/3D) systems has revealed a powerful strategy to boost the performances of perovskite photovoltaics (PVs). Despite recent advances, a clear understanding of the intimate link between interface structure and physics is still missing, leading so far to a blind optimization of the 2D/3D PVs. Here, we reveal the impact of 2D/3D crystal alignment in driving interface charge-recombination dynamics. The 2D crystal growth and orientation are manipulated by specific fluorination of phenethylammonium (PEA), used here as the organic cation backbone of the 2D component. By means of time-resolved optoelectronic analysis from the femto- to microsecond regions, we demonstrate a static function of the 2D layer as an electron barrier and homogeneous surface passivant, together with a dynamic role in retarding back charge recombination. Our results reveal a crucial dependence of such beneficial effects with the 2D layer, leading to an enhanced open-circuit voltage (V-oc), mostly attributed to the 2D phase which orients parallel on the 3D layer. Such findings provide a deep understanding and delineate precise guidelines for the smart design of multidimensional perovskite interfaces for advanced PVs and beyond.

引用

页码：5713 / 5720

页数：9

共 24 条

[1] Electroabsorption by 0D, 1D, and 2D Nanocrystals: A Comparative Study of CdSe Colloidal Quantum Dots, Nanorods, and Nanoplatelets [J].