Titanium-carbide MXenes for work function and interface engineering in perovskite solar cells (vol 3, pg 515, 2019)

被引：19

作者：

Agresti, A.

Pazniak, A.

Pescetelli, S.

Di Vito, A.

Rossi, D.

Pecchia, A.

Maur, M. Auf Der

Liedl, A.

Larciprete, R.

Kuznetsov, Denis V.

Saranin, D.

Di Carlo, A.

机构：

[1] Centre for Hybrid and Organic Solar Energy, Department of Electronic Engineering, University of Rome Tor Vergata, Rome

[2] Laboratory of Advanced Solar Energy, National University of Science and Technology ‘MISiS’, Moscow

[3] Department of Functional Nanosystems and High-Temperature Materials, National University of Science and Technology ‘MISiS’, Moscow

[4] Istituto per lo Studio Materiali Nanostrutturati—CNR, Rome

[5] INFN-LNF, Frascati

[6] CNR-Institute for Complex Systems, Rome

来源：

NATURE MATERIALS | 2019年 / 18卷 / 11期

关键词：

Charge transfer - Perovskite solar cells - Electron transport properties - Tuning - Density functional theory - Electronic properties - Photoelectron spectroscopy - Titanium carbide - Titanium dioxide - Efficiency - Cell engineering - Work function - Transition metals;

D O I：

10.1038/s41563-019-0527-9

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：

To improve the efficiency of perovskite solar cells, careful device design and tailored interface engineering are needed to enhance optoelectronic properties and the charge extraction process at the selective electrodes. Here, we use two-dimensional transition metal carbides (MXene Ti3C2Tx) with various termination groups (Tx) to tune the work function (WF) of the perovskite absorber and the TiO2 electron transport layer (ETL), and to engineer the perovskite/ETL interface. Ultraviolet photoemission spectroscopy measurements and density functional theory calculations show that the addition of Ti3C2Tx to halide perovskite and TiO2 layers permits the tuning of the materials’ WFs without affecting other electronic properties. Moreover, the dipole induced by the Ti3C2Tx at the perovskite/ETL interface can be used to change the band alignment between these layers. The combined action of WF tuning and interface engineering can lead to substantial performance improvements in MXene-modified perovskite solar cells, as shown by the 26% increase of power conversion efficiency and hysteresis reduction with respect to reference cells without MXene. © 2019, The Author(s), under exclusive licence to Springer Nature Limited.

引用

页码：1264 / 1264

页数：1