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Article: Efficient Nonfullerene Organic Solar Cells with Small Driving Forces for Both Hole and Electron Transfer

TitleEfficient Nonfullerene Organic Solar Cells with Small Driving Forces for Both Hole and Electron Transfer
Authors
Keywordsvoltage loss
charge transfer
organic solar cells
small-molecular acceptors
Issue Date2018
Citation
Advanced Materials, 2018, v. 30, n. 45, article no. 1804215 How to Cite?
Abstract© 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim State-of-the-art organic solar cells (OSCs) typically suffer from large voltage loss (Vloss) compared to their inorganic and perovskite counterparts. There are some successful attempts to reduce the Vloss by decreasing the energy offsets between the donor and acceptor materials, and the OSC community has demonstrated efficient systems with either small highest occupied molecular orbital (HOMO) offset or negligible lowest unoccupied molecular orbital (LUMO) offset between donors and acceptors. However, efficient OSCs based on a donor/acceptor system with both small HOMO and LUMO offsets have not been demonstrated simultaneously. In this work, an efficient nonfullerene OSC is reported based on a donor polymer named PffBT2T-TT and a small-molecular acceptor (O-IDTBR), which have identical bandgaps and close energy levels. The Fourier-transform photocurrent spectroscopy external quantum efficiency (FTPS-EQE) spectrum of the blend overlaps with those of neat PffBT2T-TT and O-IDTBR, indicating the small driving forces for both hole and electron transfer. Meanwhile, the OSCs exhibit a high electroluminescence quantum efficiency (EQEEL) of ≈1 × 10−4, which leads to a significantly minimized nonradiative Vloss of 0.24 V. Despite the small driving forces and a low Vloss, a maximum EQE of 67% and a high power conversion efficiency of 10.4% can still be achieved.
Persistent Identifierhttp://hdl.handle.net/10722/285941
ISSN
2019 Impact Factor: 27.398
2015 SCImago Journal Rankings: 9.021
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorChen, Shangshang-
dc.contributor.authorWang, Yuming-
dc.contributor.authorZhang, Lin-
dc.contributor.authorZhao, Jingbo-
dc.contributor.authorChen, Yuzhong-
dc.contributor.authorZhu, Danlei-
dc.contributor.authorYao, Huatong-
dc.contributor.authorZhang, Guangye-
dc.contributor.authorMa, Wei-
dc.contributor.authorFriend, Richard H.-
dc.contributor.authorChow, Philip C.Y.-
dc.contributor.authorGao, Feng-
dc.contributor.authorYan, He-
dc.date.accessioned2020-08-18T04:57:02Z-
dc.date.available2020-08-18T04:57:02Z-
dc.date.issued2018-
dc.identifier.citationAdvanced Materials, 2018, v. 30, n. 45, article no. 1804215-
dc.identifier.issn0935-9648-
dc.identifier.urihttp://hdl.handle.net/10722/285941-
dc.description.abstract© 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim State-of-the-art organic solar cells (OSCs) typically suffer from large voltage loss (Vloss) compared to their inorganic and perovskite counterparts. There are some successful attempts to reduce the Vloss by decreasing the energy offsets between the donor and acceptor materials, and the OSC community has demonstrated efficient systems with either small highest occupied molecular orbital (HOMO) offset or negligible lowest unoccupied molecular orbital (LUMO) offset between donors and acceptors. However, efficient OSCs based on a donor/acceptor system with both small HOMO and LUMO offsets have not been demonstrated simultaneously. In this work, an efficient nonfullerene OSC is reported based on a donor polymer named PffBT2T-TT and a small-molecular acceptor (O-IDTBR), which have identical bandgaps and close energy levels. The Fourier-transform photocurrent spectroscopy external quantum efficiency (FTPS-EQE) spectrum of the blend overlaps with those of neat PffBT2T-TT and O-IDTBR, indicating the small driving forces for both hole and electron transfer. Meanwhile, the OSCs exhibit a high electroluminescence quantum efficiency (EQEEL) of ≈1 × 10−4, which leads to a significantly minimized nonradiative Vloss of 0.24 V. Despite the small driving forces and a low Vloss, a maximum EQE of 67% and a high power conversion efficiency of 10.4% can still be achieved.-
dc.languageeng-
dc.relation.ispartofAdvanced Materials-
dc.subjectvoltage loss-
dc.subjectcharge transfer-
dc.subjectorganic solar cells-
dc.subjectsmall-molecular acceptors-
dc.titleEfficient Nonfullerene Organic Solar Cells with Small Driving Forces for Both Hole and Electron Transfer-
dc.typeArticle-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1002/adma.201804215-
dc.identifier.pmid30276887-
dc.identifier.scopuseid_2-s2.0-85054174364-
dc.identifier.volume30-
dc.identifier.issue45-
dc.identifier.spagearticle no. 1804215-
dc.identifier.epagearticle no. 1804215-
dc.identifier.eissn1521-4095-
dc.identifier.isiWOS:000449819500004-
dc.identifier.issnl0935-9648-

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