Niva A. Ran, John A. Love, Michael C. Heiber, Xuechen Jiao, Michael P. Hughes, Akchheta Karki, Ming Wang, Viktor V. Brus, Hengbin Wang, Dieter Neher, Harald Ade, Guillermo C. Bazan, Thuc-Quyen Nguyen
- Organic bulk heterojunction (BHJ) solar cells require energetic offsets between the donor and acceptor to obtain high short-circuit currents (J(SC)) and fill factors (FF). However, it is necessary to reduce the energetic offsets to achieve high open-circuit voltages (V-OC). Recently, reports have highlighted BHJ blends that are pushing at the accepted limits of energetic offsets necessary for high efficiency. Unfortunately, most of these BHJs have modest FF values. How the energetic offset impacts the solar cell characteristics thus remains poorly understood. Here, a comprehensive characterization of the losses in a polymer:fullerene BHJ blend, PIPCP:phenyl-C61-butyric acid methyl ester (PC61BM), that achieves a high V-OC (0.9 V) with very low energy losses (E-loss = 0.52 eV) from the energy of absorbed photons, a respectable J(SC) (13 mA cm(-2)), but a limited FF (54%) is reported. Despite the low energetic offset, the system does not suffer from field-dependent generation and instead it is characterized by very fast nongeminateOrganic bulk heterojunction (BHJ) solar cells require energetic offsets between the donor and acceptor to obtain high short-circuit currents (J(SC)) and fill factors (FF). However, it is necessary to reduce the energetic offsets to achieve high open-circuit voltages (V-OC). Recently, reports have highlighted BHJ blends that are pushing at the accepted limits of energetic offsets necessary for high efficiency. Unfortunately, most of these BHJs have modest FF values. How the energetic offset impacts the solar cell characteristics thus remains poorly understood. Here, a comprehensive characterization of the losses in a polymer:fullerene BHJ blend, PIPCP:phenyl-C61-butyric acid methyl ester (PC61BM), that achieves a high V-OC (0.9 V) with very low energy losses (E-loss = 0.52 eV) from the energy of absorbed photons, a respectable J(SC) (13 mA cm(-2)), but a limited FF (54%) is reported. Despite the low energetic offset, the system does not suffer from field-dependent generation and instead it is characterized by very fast nongeminate recombination and the presence of shallow traps. The charge-carrier losses are attributed to suboptimal morphology due to high miscibility between PIPCP and PC61BM. These results hold promise that given the appropriate morphology, the J(SC), V-OC, and FF can all be improved, even with very low energetic offsets.…
MetadatenAuthor details: | Niva A. RanORCiD, John A. Love, Michael C. Heiber, Xuechen JiaoORCiD, Michael P. Hughes, Akchheta Karki, Ming Wang, Viktor V. BrusORCiD, Hengbin Wang, Dieter NeherORCiDGND, Harald Ade, Guillermo C. Bazan, Thuc-Quyen Nguyen |
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DOI: | https://doi.org/10.1002/aenm.201701073 |
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ISSN: | 1614-6832 |
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ISSN: | 1614-6840 |
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Title of parent work (English): | dvanced energy materials |
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Publisher: | Wiley-VCH |
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Place of publishing: | Weinheim |
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Publication type: | Article |
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Language: | English |
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Date of first publication: | 2018/10/11 |
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Publication year: | 2018 |
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Release date: | 2022/01/24 |
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Tag: | energetic offset; fill factor; morphology; organic solar cells; recombination |
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Volume: | 8 |
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Issue: | 5 |
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Number of pages: | 12 |
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Funding institution: | Department of the Navy, Office of Naval ResearchOffice of Naval Research [N00014-14-1-0580]; BMBFFederal Ministry of Education & Research (BMBF); Deutsche ForschungsgesellschaftGerman Research Foundation (DFG) [INST 336/94-1 FUGG]; Office of Naval ResearchOffice of Naval Research [N00141512322]; Department of EnergyUnited States Department of Energy (DOE) [DE-AC02-05CH11231] |
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Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |
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DDC classification: | 5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik |
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Peer review: | Referiert |
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Publishing method: | Open Access / Bronze Open-Access |
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