Suppressed charge carrier trap states and double photon absorption in substitutional Ta-doped TiO2-NT array

被引：3

作者：

Huai, Xiaochen ^{[1
,3
]}

Rizzi, Gian Andrea ^{[2
]}

Wang, Yanfeng ^{[1
]}

Qi, Qige ^{[1
]}

Granozzi, Gaetano ^{[2
]}

Fu, Wangyang ^{[1
]}

Zhang, Zhengjun ^{[1
]}

机构：

[1] Tsinghua Univ, Sch Mat Sci & Engn, Key Lab Adv Mat MOE, Beijing 100084, Peoples R China

[2] Univ Padua, Dipartimento Sci Chim, Via Marzolo 1, I-35131 Padua, Italy

[3] China Three Gorges Corp, Inst Sci & Technol, Beijing 100038, Peoples R China

来源：

NANO TODAY | 2022年 / 43卷

基金：

中国国家自然科学基金;

关键词：

TiO2; NTs; Substitutional Ta doping; Electron transport materials; Charge carrier trap states; Double-photon absorption; EFFICIENT; PHOTOCATALYSIS; LAYER;

D O I：

10.1016/j.nantod.2022.101407

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Anatase-TiO2 nanotubes (A-TiO2 NTs) represent a great opportunity for the electron transport materials used in perovskite solar cells because of several intrinsic advantages, e.g. an improved light trapping effect, an inherent ion-blocking layer, a directed electron transmission channel without interfacial random scattering. Nevertheless, its severe double-photon absorption and charge carrier trap states badly jeopardize the stability and electron transport of the perovskite active layers (PALs) under visible light, representing a major obstacle for practical applications. In this paper, we introduce Ta to substitute Ti position in A-TiO2 NTs lattice through a simple fluorination process, and reveal its underneath mechanism on suppresing the abovementioned limiting factors of charge carrier trap states and double-photon absorption. Moreover, we use the effect of double-photon absorption of studied NTs to excite the photogenerated carriers under a modulated sinusoidal visible light with small amplitude, which can perturb the transport dynamics of photo-induced charge carriers and simulate the dynamic process of charge carriers at the interface between electron transport layer (ETL) and PALs in real time. These achievements highlight the unique potential of substitutional Ta doping for interfacing engineering of perovskite solar cells. (c) 2022 Elsevier Ltd. All rights reserved.

引用

页数：11