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Title: | Effect of H- and J-Aggregation on the Photophysical and Voltage Loss of Boron Dipyrromethene Small Molecules in Vacuum-Deposited Organic Solar Cells | Authors: | Li, Tian-yi Benduhn, Johannes Qiao, Zhi Liu, Yuan Li, Yue Shivhare, Rishi Jaiser, Frank Wang, Pei Ma, Jie Zeika, Olaf Neher, Dieter Mannsfeld, Stefan C. B. Ma, Zaifei VANDEWAL, Koen Leo, Karl |
Issue Date: | 2019 | Publisher: | AMER CHEMICAL SOC | Source: | JOURNAL OF PHYSICAL CHEMISTRY LETTERS, 10(11), p. 2684-2691 | Abstract: | An understanding of the factors limiting the open-circuit voltage (V-oc) and related photon energy loss mechanisms is critical to increase the power conversion efficiency (PCE) of small-molecule organic solar cells (OSCs), especially those with near-infrared (NIR) absorbers. In this work, two NIR boron dipyrromethene (BODIPY) molecules are characterized for application in planar (PHJ) and bulk (BHJ) heterojunction OSCs. When two H atoms are substituted by F atoms on the peripheral phenyl rings of the molecules, the molecular aggregation type in the thin film changes from the H-type to J-type. For PHJ devices, the nonradiative voltage loss of 0.35 V in the J-aggregated BODIPY is lower than that of 0.49 V in the H-aggregated device. In BHJ devices with a nonradiative voltage loss of 0.35 V, a PCE of 5.5% is achieved with an external quantum efficiency (EQE) maximum of 68% at 700 nm. | Notes: | [Li, Tian-yi; Benduhn, Johannes; Qiao, Zhi; Liu, Yuan; Li, Yue; Zeika, Olaf; Ma, Zaifei; Vandewal, Koen; Leo, Karl] Tech Univ Dresden, Dresden Integrated Ctr Appl Phys & Photon Mat IAP, Nothnitzer Str 61, D-01187 Dresden, Germany. [Shivhare, Rishi] Tech Univ Dresden, Ctr Adv Elect Dresden Cfaed, Nothnitzer Str 61, D-01187 Dresden, Germany. [Jaiser, Frank; Neher, Dieter] Univ Potsdam, Dept Phys & Astron, Karl Liebknecht Str 24-25, D-14476 Potsdam, Germany. [Wang, Pei] Leibniz Inst Solid State & Mat Res Dresden, Helmholtzstr 20, D-01069 Dresden, Germany. [Ma, Jie] Univ Southern Calif, Dept Chem, Los Angeles, CA 90089 USA. [Ma, Zaifei] Donghua Univ, Ctr Adv Low Dimens Mat, Renmin North Rd 2999, Shanghai, Peoples R China. [Vandewal, Koen] Hasselt Univ, Inst Mat Res, B-3590 Diepenbeek, Belgium. | Document URI: | http://hdl.handle.net/1942/28954 | ISSN: | 1948-7185 | DOI: | 10.1021/acs.jpclett.9b01222 | ISI #: | 000471079400007 | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2020 |
Appears in Collections: | Research publications |
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