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Chang, Y.C.; Larrain, F.A.; Fuentes-Hernandez, C.; Park, Y.; Kippelen, B. |
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Title |
Inverted organic tandem solar cells with a charge recombination stack employing spatially confined p-type electrical doping |
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2023 |
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Journal of Applied Physics |
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J. Appl. Phys. |
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134 |
Issue |
9 |
Pages |
095502 |
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Keywords |
SEMICONDUCTING POLYMER-FILMS; LAYER |
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Abstract |
We report on the application of solution-based p-type electrical doping using 12-molybdophosphoric acid hydrate (PMA) to the fabrication of organic tandem solar cells. Such a doping approach leads to a spatially confined vertical doping profile down to a limited depth from the surface of polymer films, thus allowing the hole-collecting component of the charge recombination stack to be embedded in the photoactive layer of the bottom sub-cell. This simplifies the device architecture by removing the need for an extra dedicated hole-collecting layer. It is shown that this novel charge recombination stack comprising a PMA-doped bottom photoactive layer and a trilayer of Ag/AZO/PEIE is compatible with a solution-processed top photoactive layer. The fabricated inverted organic tandem solar cells exhibit an open-circuit voltage that is close to the sum of the open-circuit voltages of the individual sub-cells, and a fill factor that is close to the better fill factor of the two sub-cells. |
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0021-8979 |
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WOS:001063559900006 |
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UAI @ alexi.delcanto @ |
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1890 |
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Author |
Chang, Y.C.; Larrain, F.A.; Fuentes-Hernandez, C.; Park, Y.; Kippelen, B. |
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Solution-based electrical doping of organic photovoltaics with non-fullerene acceptors facilitated by solvent vapor pre-treatment |
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2024 |
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AIP Advances |
Abbreviated Journal |
AIP Advances |
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14 |
Issue |
1 |
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015247 |
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Keywords |
SEMICONDUCTING POLYMER-FILMS; EFFICIENCY |
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Abstract |
Solution-based electrical doping of organic semiconductors using 12-molybdophosphoric acid (PMA) hydrate has been shown to allow p-type doping of conjugated polymers over a limited depth from the surface, enabling the fabrication of organic solar cells with a simplified device architecture. However, the doping level of certain conjugated polymers using PMA was found to be limited by the polymer film volume. Here, we report a modified PMA doping technique based on film volume expansion that is applicable to device fabrication, leading to hole-collecting layer-free non-fullerene organic photovoltaic devices, which exhibit a comparable photovoltaic performance to those with a commonly evaporated MoO3 hole-collecting layer. (c) 2024 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license(http://creativecommons.org/licenses/by/4.0/). |
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2158-3226 |
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WOS:001151322100004 |
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UAI @ alexi.delcanto @ |
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1943 |
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