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A naphthalene diimide side-chain polymer as an electron-extraction layer for stable perovskite solar cells

Journal Article · · Materials Chemistry Frontiers
DOI:https://doi.org/10.1039/d0qm00685h· OSTI ID:1706107
Poly(N-(5-(5-norbornene-2-carbonyl)oxy)pentyl)-N'-n-hexyl-naphthalene-1,8:4,5-bis(dicarboximide) has been synthesized by esterification of (N-(5-hydroxypentyl)-N'-n-hexyl-naphthalene-1,8:4,5-bis(dicarboximide)) with exo-5-norbornene-2-carboxylic acid, and has been polymerized using the first-generation Grubbs initiator. This side-chain polymer exhibits good transparency throughout the visible (absorption onset at ca. 400 nm), good solubility in common low- and medium-polarity organic solvents, good resistance to dimethylformamide, and appropriate electron affinity for use as an electron-extraction layer in lead-halide perovskite solar cells. The performance of this polymer in n-i-p perovskite solar cells was compared to that of several small-molecule naphthalene-1,8:4,5-bis(dicarboximide) derivatives and of SnO2. Solar cells using the polymer exhibited open-circuit voltages of up to 1.02 V, short-circuit currents of over 21 mA cm–2, and power conversion efficiencies (PCE) reaching 14% which stabilize at 13.8% upon 90 s of illumination. Meanwhile control SnO2 devices exhibited a PCE of ca. 16%, and small-molecule devices gave PCE values of less than 10%. Here, the devices employing the polymer exhibited improved long-term stability relative to the SnO2 control devices under continuous illumination.
Research Organization:
Univ. of Washington, Seattle, WA (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office
Grant/Contract Number:
EE0008747
OSTI ID:
1706107
Alternate ID(s):
OSTI ID: 1703710
OSTI ID: 1706114
OSTI ID: 1968853
Journal Information:
Materials Chemistry Frontiers, Journal Name: Materials Chemistry Frontiers Journal Issue: 1 Vol. 5; ISSN 2052-1537
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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