Improved Performance and Stability of Organic Solar Cells by the Incorporation of a Block Copolymer Interfacial Layer

Abstract

In a proof-of-concept study, this work demonstrates that incorporating a specifically designed block copolymer as an interfacial layer between a charge transport layer and the photoactive layer in organic solar cells can enhance the interface between these layers leading to both performance and stability improvements of the device. This is achieved by incorporating a P3HT50-b-PSSx block copolymer as an interfacial layer between the hole transporting and photoactive layers, which results in the improvement of the interfacial roughness, energy level alignment, and stability between these layers. Specifically, the incorporation of a 10 nm P3HT50-b-PSS16 and a 13 nm P3HT50-b-PSS23 interfacial layer results in a 9% and a 12% increase in device efficiency respectively compared to the reference devices. In addition to having a higher initial efficiency, the devices with the block copolymer continue to have a higher normalized efficiency than the control devices after 2200 h of storage, demonstrating that the block copolymer not only improves device efficiency, but crucially, prevents degradation by stabilizing the interface between the hole transporting layer and the photoactive layer. This study proves that appropriately designed and optimized block copolymers can simultaneously stabilize and improve the efficiency of organic solar cells.

Publication DOI: https://doi.org/10.1002/admi.202000918
Divisions: College of Engineering & Physical Sciences > Aston Institute of Materials Research (AIMR)
College of Engineering & Physical Sciences
College of Engineering & Physical Sciences > School of Infrastructure and Sustainable Engineering > Chemical Engineering & Applied Chemistry
Additional Information: © 2020 The Authors. Published by Wiley‐VCH GmbH This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. Funding: National Council of Science and Technology, Mexico; Mexico Secretary of Energy. Grant Numbers: 580474/411378, CVU 693809; European Union Seventh Framework Programme. Grant Numbers: FP7/2011 SYNABCO, 273316, FP7/2011, 290022; Laboratory for Process Engineering, Environment, Biotechnology and Energy – LEPABE. Grant Number: UIDB/00511/2020; FCT/MCTES; EPSRC. Grant Number: EP/M025020/1
Uncontrolled Keywords: block copolymers,interfacial layers,organic solar cells,power conversion efficiency,stability,Mechanics of Materials,Mechanical Engineering
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Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
https://onlinel ... /admi.202000918 (Publisher URL)
PURE Output Type: Article
Published Date: 2020-09-24
Published Online Date: 2020-08-02
Accepted Date: 2020-08-02
Authors: Pérez, Gabriel E.
Erothu, Harikrishna
Topham, Paul D. (ORCID Profile 0000-0003-4152-6976)
Bastianini, Francesco
Alanazi, Tarek I.
Bernardo, Gabriel
Parnell, Andrew J.
King, Stephen M.
Dunbar, Alan D.F.

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