Performance Enhancement of Tri‐Cation and Dual‐Anion Mixed Perovskite Solar Cells by Au@SiO2 Nanoparticles. (6th April 2017)

• Record Type: Journal Article
• Authors: Ye, Tao; Ma, Shaoyang; Jiang, Xi; Wei, Lei; Vijila, Chellappan; Ramakrishna, Seeram
• Is Part Of: Advanced functional materials. Volume 27:Number 22(2017)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2017-04-06
• Subjects: Au@SiO2 nanoparticles -- FDTD -- free charge carriers -- interfaces -- perovskite solar cells; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.201606545
• Languages: English
• ISSNs: 1616-301X

Abstract

Abstract : Tri‐cation and dual‐anion mixed perovskites have been widely utilized in perovskite solar cell (PSC) applications due to their novel properties such as high absorption, high stability, and low cost. To commercialize the PSCs, further improving the device performance without detrimentally changing the device configuration is important at present. Herein, Au@SiO2 nanoparticles (NPs) are introduced to modify the interface between mesoporous TiO2 (mp‐TiO2 ) and mixed perovskite with increased main photovoltaic parameters of the device, resulting in a ≈29% enhancement of power conversion efficiency (PCE) from 15.8% to 20.3%. The origins of the enhancement have been studied by exploring the optical absorption, optical power distribution, and charge carrier behaviors within the system. The small perturbation transient photovoltage measurement exhibits prolonged charge carrier lifetimes after the Au@SiO2 NPs incorporation, and time of flight photoconductivity measurement shows that charge carrier mobilities of this system are also enhanced. These characteristics make metallic nanostructures a promising functional material in facile tuning of the charge carriers transport and further boosting the PCE of the PSCs. Abstract : Au@SiO2 core−shell nanoparticles are incorporated into perovskite solar cells based on tri‐cation (cesium, methylammonium, and formamidinium) and dual‐anion (Br and I) mixed perovskite. Significant enhancements are observed in nearly all photovoltaic parameters after Au@SiO2 nanoparticles incorporation. The enhanced device performance can be ascribed to the light absorption enhancement, more efficient carrier injection/transport, and the enhanced charge carriers mobilities.