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http://hdl.handle.net/1942/31336
Title: | Negligible Energy Loss During Charge Generation in Small-Molecule/Fullerene Bulk-Heterojunction Solar Cells Leads to Open-Circuit Voltage over 1.10 V | Authors: | Babics, Maxime Duan, Tainan Balawi, Ahmed H. Liang, Ru-Ze Cruciani, Federico Carja, Ionela-Daniela Gottlieb, Dale McCulloch, Iain VANDEWAL, Koen Laquai, Frederic Beaujuge, Pierre M. |
Issue Date: | 2019 | Publisher: | AMER CHEMICAL SOC | Source: | ACS APPLIED ENERGY MATERIALS, 2 (4) , p. 2717 -2722 | Abstract: | Solution-processable small molecules (SMs) that can serve as donors in bulk-heterojunction (BHJ) solar cells are practical alternatives to their polymer counterparts. However, SM-fullerene blends commonly suffer severe voltage losses. In general, devices that reach open-circuit voltages (V-OC) > 1 V yield low photocurrents in BHJ solar cells with fullerene acceptors (e.g., PC71BM) and modest power conversion efficiencies (PCEs). In this contribution, we report on the design, synthesis, and BHJ device characteristics of a new SM donor, 2F-DRCN5T, yielding a V-OC of up to 1.10 V with PC71BM as the fullerene acceptor, while maintaining PCEs > 7% (over 8% achieved upon solvent-vapor-annealing (SVA) treatment). The negligible energy loss during charge generation (Delta E-CT), the deep-lying HOMO of 2F-DRCN5T inferred from its large ionization potential (IP), the high charge-transfer-state energy (E-CT) of the blend, and a reduced nonradiative voltage loss account for the high V-OC achieved in BHJ solar cells. | Notes: | Duan, TN (reprint author), Chinese Acad Sci, Chongqing Inst Green & Intelligent Technol, Chongqing 401122, Peoples R China.; Beaujuge, PM (reprint author), KAUST, Phys Sci & Engn Div, KAUST Solar Ctr KSC, Thuwal 239556900, Saudi Arabia. tnduan@cigit.ac.cn; pierre.beaujuge@kaust.edu.sa |
Keywords: | organic photovoltaics; small-molecule donor; oligothiophene;;fluorination; high open-circuit voltage; low energy loss | Document URI: | http://hdl.handle.net/1942/31336 | ISSN: | 2574-0962 | DOI: | 10.1021/acsaem.8b02020 | ISI #: | WOS:000465644600046 | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2020 |
Appears in Collections: | Research publications |
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acsaem.8b02020.pdf Restricted Access | Published version | 2.14 MB | Adobe PDF | View/Open Request a copy |
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