2D MXene Based Electron Transport Layers for Efficient Non-Fullerene Acceptor Organic Photovoltaics

Um Kanta Aryal^a^,^b, Hanna Pazniak^c, Aldo Di Carlo^d^,^e, Morten Madsen^a^,^b

^aUniversity of Southern Denmark, Mads Clausen Institute, Center for Advanced Photovoltaics and Thin Film Energy Devices (SDU CAPE) Sønderborg 6400, Denmark

^bSDU Climate Cluster, University of Southern Denmark, Odense 5230, Denmark

^cUniversité Grenoble Alpes, CNRS, Grenoble INP, LMGP, Grenoble, CS 50257, Grenoble Cedex 1 38016, France

^dIstituto di Struttura della Materia, CNR-ISM, Via del Fosso del Cavaliere 100, 00133, Rome, Italy

^eCHOSE (Centre for Hybrid and Organic Solar Energy), Department of Electronic Engineering, University of Rome “Tor Vergata”, via del Politecnico 1, 00133 Rome, Italy

Materials for Sustainable Development Conference (MATSUS)
Proceedings of MATSUS Spring 2024 Conference (MATSUS24)

#MAPUP-OPV - Materials and Processes for the Scale-up of Organic Photovoltaics

Barcelona, Spain, 2024 March 4th - 8th

Organizers: Ignasi Burgués, Andreas Distler and Sergi Riera-Galindo

Oral, Um Kanta Aryal, presentation 239
DOI: https://doi.org/10.29363/nanoge.matsus.2024.239
Publication date: 18th December 2023

Implementation of 2D materials in organic photovoltaics (OPV) is one of the promising routes to modify fundamental device properties, and potentially improve device efficiency and stability due to their unique properties such as tunable electronic structure, high charge carrier mobility and high optical transparency. For MXenes, a family of 2D transition metal carbides and nitrides, the ability to tune work function via surfaces termination routes have made it especially promising as contact layer material in solar cell devices. In this work, we employ such 2D MXene, Ti₃C₂T_x, in electron transport layers (ETL) to develop composite 2D based ETL, and demonstrated their high performance for non-fullerene acceptor (NFA) based OPV. The composite 2D-ETL based OPV resulted in robust ETL-organic interfaces with efficient electron extraction and transport properties for high device performance (~14% using green solvents), and importantly, significantly prolonged device lifetime when compared to conventional 2D-free ETL based OPV. The integration of the 2D MXene interlayers in OPV is explored in terms of morphological, optical, and electrical properties along with ISOS-L device lifetime measurements. Importantly, photoelectron spectroscopy results provide insights into the modified surface defect state concentration on the ETL surface, which can directly be related to the improved device stability. The work demonstrates the unique potential of MXene as contact layer material in high performance organic photovoltaics with prolonged device lifetimes.

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