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Efficient non-fullerene organic solar cells employing sequentially deposited donor-acceptor layers
Univ Cambridge, England; Imperial Coll London, England.
Nankai Univ, Peoples R China.
Univ Cambridge, England.
Univ Sheffield, England.
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2018 (English)In: Journal of Materials Chemistry A, ISSN 2050-7488, Vol. 6, no 37, p. 18225-18233Article in journal (Refereed) Published
Abstract [en]

Non-fullerene acceptors (NFAs) have recently outperformed their fullerene counterparts in binary bulk-heterojunction (BHJ) organic solar cells (OSCs). Further development of NFA OSCs may benefit other novel OSC device structures that alter or extend the standard BHJ concept. Here, we report such a new processing route that forms a BHJ-like morphology between sequentially processed polymer donor and NFA with high power conversion efficiencies in excess of 10%. Both devices show similar charge generation and recombination behaviours, supporting formation of similar BHJ active layers. We correlate the approximate to 30 meV smaller open-circuit voltage in sq-BHJ devices to more substantial non-radiative recombination by voltage loss analysis. We also determine the exciton diffusion length of benchmark polymer PBDB-T to be 10 +/- 3 nm. Our results demonstrate high-efficiency OSC devices using sequential deposition method and provide new opportunities to further improve performance of state-of-the-art OSCs.

Place, publisher, year, edition, pages
ROYAL SOC CHEMISTRY , 2018. Vol. 6, no 37, p. 18225-18233
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:liu:diva-152822DOI: 10.1039/c8ta06860gISI: 000448340100039OAI: oai:DiVA.org:liu-152822DiVA, id: diva2:1265240
Note

Funding Agencies|Engineering and Physical Sciences Research Council; Science and Technology Facilities Council [RB1800095]; China Scholarship Council [201503170255]; SPIE Optics and Photonics Education Scholarship; NSFC [91633301]; MOST of China [2014CB643502]; [2016-02051]

Available from: 2018-11-22 Created: 2018-11-22 Last updated: 2019-03-21

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CiteExportLink to record
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Citation style
  • apa
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