Synthetic control over orientational degeneracy of spacer cations enhances solar cell efficiency in two-dimensional perovskites

被引：280

作者：

Hu, Jun ^{[1
]}

Oswald, Iain W. H. ^{[2
]}

Stuard, Samuel J. ^{[3
]}

Nahid, Masrur Morshed ^{[3
]}

Zhou, Ninghao ^{[1
]}

Williams, Olivia F. ^{[1
]}

Guo, Zhenkun ^{[1
]}

Yan, Liang ^{[1
]}

Hu, Huamin ^{[1
]}

Chen, Zheng ^{[1
]}

Xiao, Xun ^{[4
]}

Lin, Yun ^{[4
]}

Yang, Zhibin ^{[4
]}

Huang, Jinsong ^{[4
]}

Moran, Andrew M. ^{[1
]}

Ade, Harald ^{[3
]}

Neilson, James R. ^{[2
]}

You, Wei ^{[1
,4
]}

机构：

[1] Univ N Carolina, Dept Chem, Chapel Hill, NC 27599 USA

[2] Colorado State Univ, Dept Chem, Ft Collins, CO 80523 USA

[3] North Carolina State Univ, Dept Phys, Raleigh, NC 27695 USA

[4] Univ N Carolina, Dept Appl Phys Sci, Chapel Hill, NC 27599 USA

来源：

NATURE COMMUNICATIONS | 2019年 / 10卷 / 1期

基金：

美国国家科学基金会;

关键词：

LEAD IODIDE PEROVSKITE; ORGANIC-INORGANIC PEROVSKITES; LAYERED-PEROVSKITE; OPTICAL-PROPERTIES; CRYSTALLIZATION; FILMS; ELECTROLUMINESCENCE; DIMENSIONALITY; HYSTERESIS; ABSORBER;

D O I：

10.1038/s41467-019-08980-x

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Two-dimensional perovskites have emerged as more intrinsically stable materials for solar cells. Chemical tuning of spacer organic cations has attracted great interest due to their additional functionalities. However, how the chemical nature of the organic cations affects the properties of two-dimensional perovskites and devices is rarely reported. Here we demonstrate that the selection of spacer cations (i.e., selective fluorination of phenethyl-ammonium) affects the film properties of two-dimensional perovskites, leading to different device performance of two-dimensional perovskite solar cells (average n = 4). Structural analysis reveals that different packing arrangements and orientational disorder of the spacer cations result in orientational degeneracy and different formation energies, largely explaining the difference in film properties. This work provides key missing information on how spacer cations exert influence on desirable electronic properties and device performance of twodimensional perovskites via the weak and cooperative interactions of these cations in the crystal lattice.

引用

页数：11

共 69 条

[1] Quantification of Thin Film Crystallographic Orientation Using X-ray Diffraction with an Area Detector [J].