Ti3C2Tx/PEDOT:PSS Composite Interface Enables over 17% Efficiency Non-fullerene Organic Solar Cells

Jie Wang; Ruixiang Peng; Jing Gao; Dandan Li; Lin Xie; Wei Song; Xiaoli Zhang; Yaqin Fu; Ziyi Ge

doi:10.1021/acsami.1c11139

Ti₃C₂T_x/PEDOT:PSS Composite Interface Enables over 17% Efficiency Non-fullerene Organic Solar Cells

ACS Appl Mater Interfaces. 2021 Sep 29;13(38):45789-45797. doi: 10.1021/acsami.1c11139. Epub 2021 Sep 15.

Authors

Jie Wang¹, Ruixiang Peng², Jing Gao², Dandan Li², Lin Xie², Wei Song², Xiaoli Zhang³, Yaqin Fu¹, Ziyi Ge^{2

4}

Affiliations

¹ School of Materials Science and Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, Zhejiang, China.
² Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, P. R. China.
³ School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, P.R. China.
⁴ Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China.

PMID: 34523906
DOI: 10.1021/acsami.1c11139

Abstract

Metal carbide Ti₃C₂T_x as a new two-dimensional material with excellent metallic conductivity, good water solubility, and superior transmittance in the visible light range shows great potential for applications in optoelectronic devices. Herein, Ti₃C₂T_x/PEDOT:PSS composite films were fabricated by a simple solution process and employed as an anode interfacial layer in organic solar cells. By introducing the Ti₃C₂T_x/PEDOT:PSS composite interface into the devices, the highest power conversion efficiency (PCE) of 17.26% was achieved while using PM6:Y6 as the active layer, with a high short-circuit current (J_sc) of 26.52 mA/cm² and a fill factor of up to 0.76. The PCE is much higher than 15.89% for the pure PEDOT:PSS interfacial layer-based device without doping. The dramatically improved performance was attributed to the increased conductivity of the Ti₃C₂T_x/PEDOT:PSS composite interface and the increased charge extraction and collection efficiency of the devices. This work presents an effective method to prepare the Ti₃C₂T_x/PEDOT:PSS composite interface and high-performance organic solar cells.

Keywords: electrical conductivity; non-fullerene organic solar cells; recombination; two-dimensional (2D) Ti3C2Tx, composite interface.