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Title: | Hole Transport in Low-Donor-Content Organic Solar Cells | Authors: | SPOLTORE, Donato Hofacker, Andreas Benduhn, Johannes Ullbrich, Sascha Nyman, Mathias Zeika, Olaf Schellhammer, Sebastian Fan, Yeli Ramirez, Ivan Barlow, Stephen Rieder, Moritz Marder, Seth R. Ortrnann, Frank VANDEWAL, Koen |
Issue Date: | 2018 | Publisher: | AMER CHEMICAL SOC | Source: | JOURNAL OF PHYSICAL CHEMISTRY LETTERS, 9(18), p. 5496-5501 | Abstract: | Organic solar cells with an electron donor diluted in a fullerene matrix have a reduced density of donor-fullerene contacts, resulting in decreased free-carrier recombination and increased open-circuit voltages. However, the low donor concentration prevents the formation of percolation pathways for holes. Notwithstanding, high (>75%) external quantum efficiencies can be reached, suggesting an effective hole-transport mechanism. Here, we perform a systematic study of the hole mobilities of 18 donors, diluted at similar to 6 mol % in C-60, with varying frontier energy level offsets and relaxation energies. We find that hole transport between isolated donor molecules occurs by long-range tunneling through several fullerene molecules, with the hole mobilities being correlated to the relaxation energy of the donor. The transport mechanism presented in this study is of general relevance to bulk heterojunction organic solar cells where mixed phases of fullerene containing a small fraction of a donor material or vice versa are present as well. | Notes: | [Spoltore, Donato; Hofacker, Andreas; Benduhn, Johannes; Ullbrich, Sascha; Zeika, Olaf; Vandewal, Koen] Tech Univ Dresden, Dresden Integrated Ctr Appl Phys & Photon Mat IAP, D-01187 Dresden, Germany. [Spoltore, Donato; Hofacker, Andreas; Benduhn, Johannes; Ullbrich, Sascha; Zeika, Olaf; Vandewal, Koen] Tech Univ Dresden, Inst Appl Phys, D-01187 Dresden, Germany. [Nyman, Mathias] Abo Akad Univ, Phys, Fac Sci & Engn, Porthansgatan 3, Turku 20500, Finland. [Schellhammer, Sebastian; Ortrnann, Frank] Tech Univ Dresden, Ctr Advancing Elect Cfaed, D-01062 Dresden, Germany. [Schellhammer, Sebastian] Tech Univ Dresden, Inst Mat Sci, D-01062 Dresden, Germany. [Schellhammer, Sebastian] Tech Univ Dresden, Max Bergmann Ctr Biomat, D-01062 Dresden, Germany. [Fan, Yeli; Barlow, Stephen; Marder, Seth R.] Georgia Inst Technol, Ctr Organ Photon & Elect, Atlanta, GA 30332 USA. [Fan, Yeli; Barlow, Stephen; Marder, Seth R.] Georgia Inst Technol, Sch Chem & Biochem, Atlanta, GA 30332 USA. [Ramirez, Ivan; Rieder, Moritz] Univ Oxford, Dept Phys, Pk Rd, Oxford OX1 3PU, England. [Fan, Yeli] Southeast Univ, Sch Chem & Chem Engn, Nanjing 211189, Jiangsu, Peoples R China. [Ramirez, Ivan] Heliatek GmbH, Treidlerstr 3, D-01139 Dresden, Germany. [Vandewal, Koen] Hasselt Univ, Inst Mat Res IMO IMOMEC, Wetenschapspk 1, B-3590 Diepenbeek, Belgium. | Document URI: | http://hdl.handle.net/1942/27663 | ISSN: | 1948-7185 | DOI: | 10.1021/acs.jpclett.8b02177 | ISI #: | 000445713200044 | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2019 |
Appears in Collections: | Research publications |
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File | Description | Size | Format | |
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spoltore 1.pdf Restricted Access | Published version | 1.48 MB | Adobe PDF | View/Open Request a copy |
Manuscript dspoltore.pdf | Peer-reviewed author version | 1.08 MB | Adobe PDF | View/Open |
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