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Efficient and photostable ternary organic solar cells with a narrow band gap non-fullerene acceptor and fullerene additive

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Abstract

Recent breakthroughs in molecular design have allowed for remarkable achievement in the field of non-fullerene acceptor (NFA)-based organic solar cells (OSCs) with high power conversion efficiencies (PCEs) of over 15%. However, despite such promising advances, the inferior stability of OSCs under operating conditions remains a prominent challenge that must be overcome for their practical realization. Here, versatile ternary photoactive systems with simultaneously enhanced efficiency and photostability are developed by introducing a small amount of fullerene (PC71BM) into a narrow band gap NFA-based bulk heterojunction nanocomposite (PTB7-Th:IEICO-4F); this approach leads to an enhanced PCE of 10.55% and a prolonged lifetime, retaining approximately 80% of the initial PCE after 500 h of operation under continuous illumination. Based on the energy levels and surface energies of the component materials, cascade energetic alignment facilitates electron transfer without trapping. The PTB7-Th/PC71BM interface provides an energy barrier to suppress recombination between holes in PTB7-Th and electrons in IEICO-4F. Moreover, a small amount of PC71BM promotes favorable molecular packing and orientation of IEICO-4F, leading to enhanced electron mobility and balanced charge transport. A study using transient absorption spectroscopy reveals that the ternary blend effectively suppresses the evolution of charge recombination.

Graphical abstract: Efficient and photostable ternary organic solar cells with a narrow band gap non-fullerene acceptor and fullerene additive

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Supplementary files

Article information


Submitted
30 Dec 2019
Accepted
04 Mar 2020
First published
06 Mar 2020

J. Mater. Chem. A, 2020, Advance Article
Article type
Paper

Efficient and photostable ternary organic solar cells with a narrow band gap non-fullerene acceptor and fullerene additive

J. Lee, J. Lee, H. Yao, H. Cha, S. Hong, S. Lee, J. Kim, J. R. Durrant, J. Hou and K. Lee, J. Mater. Chem. A, 2020, Advance Article , DOI: 10.1039/C9TA14216A

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