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High-efficiency polymer solar cells with small photon energy loss
Open accessAbstract
A crucial issue facing polymer-based solar cells is how to manage the energetics of the polymer/fullerene blends to maximize short-circuit current density and open-circuit voltage at the same time and thus the power conversion efficiency. Here we demonstrate that the use of a naphthobisoxadiazole-based polymer with a narrow bandgap of 1.52 eV leads to high open-circuit voltages of approximately 1 V and high-power conversion efficiencies of ∼9% in solar cells, resulting in photon energy loss as small as ∼0.5 eV, which is much smaller than that of typical polymer systems (0.7–1.0 eV). This is ascribed to the high external quantum efficiency for the systems with a very small energy offset for charge separation. These unconventional features of the present polymer system will inspire the field of polymer-based solar cells towards further improvement of power conversion efficiencies with both high short-circuit current density and open-circuit voltage.
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Metadata
- Authors
- Kawashima, K., Tamai, Y., Ohkita, H., Osaka, I., & Takimiya, K.
- Venue
- Nature Communications
- Published
- 2015-12-02
- Volume
- 6
- Issue
- 1
- Pages
- 10085-10085
- ISSN
- 2041-1723 (ISSN-L)
- OpenAlex
- W2184673216
- Cited by
- 391
- References
- 43
- FWCI
- 31.11
- Type
- journal article
- Language
- en
- Open access
- gold
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