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Title: | Sub-picosecond charge-transfer at near-zero driving force in polymer:non-fullerene acceptor blends and bilayers | Authors: | Zhong, Yufei Causa', Martina Moore, Gareth John Krauspe, Philipp Xiao, Bo Guenther, Florian Kublitski, Jonas Shivhare, Rishi Benduhn, Johannes BarOr, Eyal Mukherjee, Subhrangsu Yallum, Kaila M. Rehault, Julien Mannsfeld, Stefan C. B. Neher, Dieter Richter, Lee J. DeLongchamp, Dean M. Ortmann, Frank VANDEWAL, Koen Zhou, Erjun Banerji, Natalie |
Issue Date: | 2020 | Publisher: | NATURE PUBLISHING GROUP | Source: | Nature Communications, 11 (Art N° 833) | Abstract: | Organic photovoltaics based on non-fullerene acceptors (NFAs) show record efficiency of 16 to 17% and increased photovoltage owing to the low driving force for interfacial charge-transfer. However, the low driving force potentially slows down charge generation, leading to a tradeoff between voltage and current. Here, we disentangle the intrinsic charge-transfer rates from morphology-dependent exciton diffusion for a series of polymer:NFA systems. Moreover, we establish the influence of the interfacial energetics on the electron and hole transfer rates separately. We demonstrate that charge-transfer timescales remain at a few hundred femtoseconds even at near-zero driving force, which is consistent with the rates predicted by Marcus theory in the normal region, at moderate electronic coupling and at low re-organization energy. Thus, in the design of highly efficient devices, the energy offset at the donor:acceptor interface can be minimized without jeopardizing the charge-transfer rate and without concerns about a current-voltage tradeoff. | Notes: | Banerji, N (reprint author), Univ Bern, Dept Chem & Biochem, Freiestr 3, CH-3012 Bern, Switzerland.; Zhou, E (reprint author), Natl Ctr Nanosci & Technol, CAS Ctr Excellence Nanosci, Chinese Acad Sci CAS Key Lab Nanosyst & Hierarch, Beijing 100190, Peoples R China. zhouej@nanoctr.cn; natalie.banerji@dcb.unibe.ch |
Other: | Banerji, N (reprint author), Univ Bern, Dept Chem & Biochem, Freiestr 3, CH-3012 Bern, Switzerland. Zhou, E (reprint author), Natl Ctr Nanosci & Technol, CAS Ctr Excellence Nanosci, Chinese Acad Sci CAS Key Lab Nanosyst & Hierarch, Beijing 100190, Peoples R China. zhouej@nanoctr.cn; natalie.banerji@dcb.unibe.ch | Document URI: | http://hdl.handle.net/1942/30766 | e-ISSN: | 2041-1723 | DOI: | 10.1038/s41467-020-14549-w | ISI #: | WOS:000514434800005 | Rights: | Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2021 |
Appears in Collections: | Research publications |
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