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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/28601

Title: Impact of Triplet Excited States on the Open-Circuit Voltage of Organic Solar Cells
Authors: Benduhn, Johannes
Piersimoni, Fortunato
Londi, Giacomo
Kirch, Anton
Widmer, Johannes
Koerner, Christian
Beljonne, David
Neher, Dieter
Spoltore, Donato
Vandewal, Koen
Issue Date: 2018
Publisher: WILEY-V C H VERLAG GMBH
Citation: ADVANCED ENERGY MATERIALS, 8(21) (Art N° 1800451)
Abstract: The best organic solar cells (OSCs) achieve comparable peak external quantum efficiencies and fill factors as conventional photovoltaic devices. However, their voltage losses are much higher, in particular those due to nonradiative recombination. To investigate the possible role of triplet states on the donor or acceptor materials in this process, model systems comprising Zn- and Cu-phthalocyanine (Pc), as well as fluorinated versions of these donors, combined with C-60 as acceptor are studied. Fluorination allows tuning the energy level alignment between the lowest energy triplet state (T-1) and the charge-transfer (CT) state, while the replacement of Zn by Cu as the central metal in the Pcs leads to a largely enhanced spin-orbit coupling. Only in the latter case, a substantial influence of the triplet state on the nonradiative voltage losses is observed. In contrast, it is found that for a large series of typical OSC materials, the relative energy level alignment between T-1 and the CT state does not substantially affect nonradiative voltage losses.
Notes: [Benduhn, Johannes; Kirch, Anton; Widmer, Johannes; Koerner, Christian; Spoltore, Donato; Vandewal, Koen] Tech Univ Dresden, Dresden Integrated Ctr Appl Phys & Photon Mat IAP, Nothnitzer Str 61, D-01187 Dresden, Germany. [Benduhn, Johannes; Kirch, Anton; Widmer, Johannes; Koerner, Christian; Spoltore, Donato; Vandewal, Koen] Tech Univ Dresden, Inst Appl Phys, Nothnitzer Str 61, D-01187 Dresden, Germany. [Piersimoni, Fortunato; Neher, Dieter] Univ Potsdam, Inst Phys & Astron, Karl Liebknecht Str 24-25, D-14476 Potsdam, Germany. [Londi, Giacomo; Beljonne, David] Univ Mons, Chim Mat Nouveaux, Pl Parc 20, B-7000 Mons, Belgium. [Londi, Giacomo; Beljonne, David] Univ Mons, Ctr Innovat & Rech Mat Polymeres, Pl Parc 20, B-7000 Mons, Belgium. [Widmer, Johannes] Heliatek GmbH, Treidlerstr 3, D-01139 Dresden, Germany. [Koerner, Christian] Organ Elect Saxony, Wurzburger Str 51, D-01187 Dresden, Germany. [Vandewal, Koen] Hasselt Univ, Inst Mat Res IMO IMOMEC, Wetenschapspk 1, B-3590 Diepenbeek, Belgium.
URI: http://hdl.handle.net/1942/28601
DOI: 10.1002/aenm.201800451
ISI #: 000445666000006
ISSN: 1614-6832
Category: A1
Type: Journal Contribution
Appears in Collections: Research publications

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