Perovskite Quantum Dot Photovoltaic Materials beyond the Reach of Thin Films: Full-Range Tuning of A-Site Cation Composition

被引：216

作者：

Hazarika, Abhijit ^{[1
]}

Zhao, Qian ^{[1
,2
]}

Gaulding, E. Ashley ^{[1
]}

Christians, Jeffrey A. ^{[1
]}

Dou, Benjia ^{[1
,3
]}

Marshall, Ashley R. ^{[1
]}

Moot, Taylor ^{[1
]}

Berry, Joseph J. ^{[1
]}

Johnson, Justin C. ^{[1
]}

Luther, Joseph M. ^{[1
]}

机构：

[1] Natl Renewable Energy Lab, Golden, CO 80401 USA

[2] Nankai Univ, Coll Chem, Tianjin 300071, Peoples R China

[3] Univ Colorado, Dept Elect & Comp Engn, Boulder, CO 80309 USA

来源：

ACS NANO | 2018年 / 12卷 / 10期

关键词：

perovskites; quantum dots; cation exchange; solar cells; nanocrystals; A-site alloying; lead halide; CESIUM LEAD HALIDE; ORGANIC-INORGANIC PEROVSKITES; LIGHT-EMITTING-DIODES; ANION-EXCHANGE; SOLAR-CELLS; ORGANOHALIDE PEROVSKITES; OPTICAL-PROPERTIES; NANOCRYSTALS; FORMAMIDINIUM; IODIDE;

D O I：

10.1021/acsnano.8b05555

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We present a cation-exchange approach for tunable A-site alloys of cesium (Cs+) and formamidinium (FA(+)) lead triiodide perovskite nanocrystals that enables the formation of compositions spanning the complete range of Cs(1-x)FA(x)PbI(3), unlike thin-film alloys or the direct synthesis of alloyed perovskite nanocrystals. These materials show bright and finely tunable emission in the red and near-infrared range between 650 and 800 nm. The activation energy for the miscibility between Cs+ and FA(+) is measured (similar to 0.65 eV) and is shown to be higher than reported for X-site exchange in lead halide perovskites. We use these alloyed colloidal perovskite quantum dots to fabricate photovoltaic devices. In addition to the expanded compositional range for Cs(1-x)FA(x)PbI(3) materials, the quantum dot solar cells exhibit high open circuit voltage (V-OC) with a lower loss than the thin-film perovskite devices of similar compositions.

引用

页码：10327 / 10337

页数：11

共 89 条

[1] Genesis, challenges and opportunities for colloidal lead halide perovskite nanocrystals [J].