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Suppression of Recombination Energy Losses by Decreasing the Energetic Offsets in Perylene Diimide-Based Nonfullerene Organic Solar Cells
Chinese Acad Sci, Peoples R China; Univ Chinese Acad Sci, Peoples R China.
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering.
Chinese Acad Sci, Peoples R China.
Chinese Acad Sci, Peoples R China; Univ Chinese Acad Sci, Peoples R China.
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2018 (English)In: ACS ENERGY LETTERS, ISSN 2380-8195, Vol. 3, no 11, p. 2729-2735Article in journal (Refereed) Published
Abstract [en]

In this work, a range of nonfullerene organic solar cells comprising two perylene diimide (PDI)-based small molecule acceptors in combination with four representative polymer donors have been investigated and compared. In addition to significant differences in the power conversion efficiency, the energy losses of photovoltaic devices vary widely for these two PDI-based acceptors when paired with different donors. The sensitive Fourier-transform photocurrent spectroscopy (FTPS) and electroluminescence (EL) measurements have been performed to quantify their respective energetic offsets (Delta(Eoffiet)) and energy losses, with the aim of understanding the distinct energy losses in the studied organic blends. By comparing these results, we find that with decreasing Delta(Eoffset), recombination loss due to the charge-transfer state absorption A both nonradiative recombination loss and radiative are suppressed; as a result, the total energy loss is decreased. These observations offer a deep understanding of how the energetic offset affects the energy losses from the viewpoint of the Shockey-Queisser limit.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2018. Vol. 3, no 11, p. 2729-2735
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URN: urn:nbn:se:liu:diva-153175DOI: 10.1021/acsenergylett.8b01665ISI: 000450374600014OAI: oai:DiVA.org:liu-153175DiVA, id: diva2:1267315
Note

Funding Agencies|National Natural Science Foundation of China (NSFC) [21734009, 21734001, 21672221]; NSFC-DFG [21661132006, TRR61]; Chinese Academy of Sciences [XDB12010100]; Swedish Energy Agency Energimyndigheten [2016-010174]; Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkoping University [2009-00971]; China Scholarship Council

Available from: 2018-12-01 Created: 2018-12-01 Last updated: 2019-03-22

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