Inducing Panchromatic Absorption and Photoconductivity in Polycrystalline Molecular 1D Lead-Iodide Perovskites through π-Stacked Viologens

被引：42

作者：

Febriansyah, Benny ^{[1
,2
,3
]}

Koh, Teck Ming ^{[1
]}

John, Rohit Abraham ^{[1
,4
]}

Ganguly, Rakesh ^{[3
]}

Li, Yongxin ^{[3
]}

Bruno, Annalisa ^{[1
]}

Mhaisalkar, Subodh G. ^{[1
,4
]}

England, Jason ^{[3
]}

机构：

[1] Nanyang Technol Univ ERI N, Energy Res Inst, Res Techno Plaza,10 Frontier Block Level 5, Singapore 637553, Singapore

[2] Nanyang Technol Univ, IGS, 50 Nanyang Ave, Singapore 639798, Singapore

[3] Nanyang Technol Univ, Sch Phys & Math Sci, Div Chem & Biol Chem, 21 Nanyang Link, Singapore 637371, Singapore

[4] Nanyang Technol Univ, Sch Mat Sci & Engn, 50 Nanyang Ave, Singapore 639798, Singapore

来源：

CHEMISTRY OF MATERIALS | 2018年 / 30卷 / 17期

基金：

新加坡国家研究基金会;

关键词：

NANOWIRES; CRYSTAL;

D O I：

10.1021/acs.chemmater.8b02038

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：

As a consequence of their quantum- and electronically-confined inorganic lattices, molecular 1D lead-iodide perovskites are ill suited to photovoltaic (PV) applications. In order to circumvent these problems, we utilized electron accepting viologen (N,N'-dialkyl-4,4'-bipyridinium) dications incorporating hydrogen bond donor functionalities, which served to induce pi-pi stacking interactions. The resulting 'viologen dimers' display enhanced charge-transfer (CT) interactions with the 1D lead-iodide nanowires. This manifests in extended light absorption (up to 800 nm), reduced band gaps (1.74 eV to 1.77 eV), and longer photoluminescence lifetimes. More importantly, we demonstrate significant photoconductivity behavior in polycrystalline molecular 1D lead-iodide perovskites for the first time. Thus, this work offers a strategy for inducing the properties required for PV applications in molecular 1D lead-iodide perovskites.

引用

页码：5827 / 5830

页数：4

共 22 条

[1] (EDT-TTF-I2)2PbI3•H2O:: an ambient pressure metal with a β′ donor slab topology [J].