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Title: | The Role of Acceptor Properties on the Hole Transport Mechanism in Low-Donor-Content Organic Solar Cells | Authors: | Kublitski, Jonas Londi, Giacomo Talnack, Felix Hambsch, Mike Xing, Shen Wolansky, Jakob Mannsfeld, Stefan C. B. VANDEWAL, Koen Benduhn, Johannes Leo, Karl Beljonne, David SPOLTORE, Donato |
Issue Date: | 2024 | Publisher: | AMER CHEMICAL SOC | Source: | CHEMISTRY OF MATERIALS, 36 (8) , p. 3555 -3562 | Abstract: | Organic solar cells offer several advantages over conventional photovoltaics, such as flexibility, low cost, and abundant materials, and are thus seen as a promising choice for energy harvesting. A rather particular case refers to diluted systems, where a small number of electron-donating molecules are dispersed within an acceptor matrix, hampering hole transport in the absence of percolation paths. Nonetheless, diluted systems present a reasonable performance, thereby raising discussions on how this is achieved. Here, we investigate the hole transport by measuring the hole mobility in several systems with varying donor concentrations. We found an unexpected correlation between the hole mobility and the energy offset between the donor HOMO and the acceptor LUMO (instead of the acceptor HOMO), with the mobility increasing as the offset decreases. Such a correlation is supported by molecular modeling suggesting a contribution from the acceptor LUMO-mediated superexchange mechanism. These results corroborate our experimental observation, hinting at a previously neglected mechanism of transport, which depends on the coupling between the donor HOMO and the acceptor LUMO. | Notes: | Beljonne, D (corresponding author), Univ Mons, Lab Chem Novel Mat, B-7000 Mons, Belgium.; Kublitski, J; Spoltore, D (corresponding author), Tech Univ Dresden, Dresden Integrated Ctr Appl Phys & Photon Mat IAP, D-01187 Dresden, Germany.; Kublitski, J; Spoltore, D (corresponding author), Tech Univ Dresden, Inst Appl Phys, D-01187 Dresden, Germany.; Kublitski, J (corresponding author), Univ Tecnol Fed Parana UTFPR, Dept Phys, Ave 7 Setembro 3165, BR-80230901 Curitiba, Parana, Brazil.; Spoltore, D (corresponding author), Univ Parma, Dept Math Phys & Comp Sci, I-43124 Parma, Italy. jkublitski@utfpr.edu.br; David.beljonne@umons.ac.be; donato.spoltore@unipr.it |
Document URI: | http://hdl.handle.net/1942/42903 | ISSN: | 0897-4756 | e-ISSN: | 1520-5002 | DOI: | 10.1021/acs.chemmater.3c02263 | ISI #: | 001200573500001 | Rights: | 2024 American Chemical Society | Category: | A1 | Type: | Journal Contribution |
Appears in Collections: | Research publications |
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kublitski-et-al-2024-the-role-of-acceptor-properties-on-the-hole-transport.pdf Restricted Access | Published version | 2.6 MB | Adobe PDF | View/Open Request a copy |
author version_Low_Donor_Paper.pdf Until 2024-09-05 | Peer-reviewed author version | 1.76 MB | Adobe PDF | View/Open Request a copy |
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