Photochemical Decomposition of Y‐Series Non‐Fullerene Acceptors Is Responsible for Degradation of High‐Efficiency Organic Solar Cells

Liu, Tianran; Burlingame, Quinn C.; Ivancevic, Marko R.; Liu, Xiao; Hu, Junnan; Rand, Barry P.; Loo, Yueh‐Lin

doi:10.1002/aenm.202300046

Title: Photochemical Decomposition of Y‐Series Non‐Fullerene Acceptors Is Responsible for Degradation of High‐Efficiency Organic Solar Cells

Journal Article · 07 March 2023 · Advanced Energy Materials

DOI: https://doi.org/10.1002/aenm.202300046 · OSTI ID:1960637

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Department of Electrical and Computer Engineering Princeton University Princeton NJ 08544 USA
Andlinger Center for Energy and the Environment Princeton University Princeton NJ 08544 USA
Department of Chemical and Biological Engineering Princeton University Princeton NJ 08544 USA
Department of Electrical and Computer Engineering Princeton University Princeton NJ 08544 USA, Andlinger Center for Energy and the Environment Princeton University Princeton NJ 08544 USA

Abstract Organic photovoltaic cells that employ Y‐series non‐fullerene acceptors (NFAs) have recently achieved impressive power‐conversion efficiencies (>18%). To fulfill their commercial promise, it is important to quantify their operational lifetimes and understand their degradation mechanisms. In this work, the spectral‐dependent photostability of films and solar cells comprising several Y‐series acceptors and the donor polymer PM6 is investigated systematically. By applying longpass filters during aging, it is shown that UV/near‐UV photons are responsible for the photochemical decomposition of Y‐series acceptors; this degradation is the primary driver of early solar cell performance losses. Using mass spectrometry, the vinylene linkage between the core and electron‐accepting moieties of Y‐series acceptors is identified as the weak point susceptible to cleavage under UV‐illumination. Employing a series of device characterization, along with numerical simulations, the efficiency losses in organic photovoltaic cells are attributed to the formation of traps, which reduces charge extraction efficiency and facilitates non‐radiative recombination as the Y‐series acceptors degrade. This study provides new insights for molecular degradation of organic photovoltaic absorber materials and highlights the importance of future molecular design and strategies for improved solar cell stability.

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Research Organization:: Princeton University, NJ (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)

Grant/Contract Number:: SC0012458; SC0012704

OSTI ID:: 1960637

Journal Information:: Advanced Energy Materials, Journal Name: Advanced Energy Materials Journal Issue: 17 Vol. 13; ISSN 1614-6832

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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14 SOLAR ENERGY
Y-series
high-energy photons
non-fullerene acceptors
organic solar cells
photochemical degradation
stability
traps

Title: Photochemical Decomposition of Y‐Series Non‐Fullerene Acceptors Is Responsible for Degradation of High‐Efficiency Organic Solar Cells

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