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Author Larrain, F.A.; Fuentes-Hernandez, C.; Chang, Y.CH.; Rodriguez-Toro, V.A.; Abraham, S.; Kippelen, B.
Title Increasing Volume in Conjugated Polymers to Facilitate Electrical Doping with Phosphomolybdic Acid Type
Year 2021 Publication (up) ACS Applied Materials & Interfaces Abbreviated Journal ACS Appl. Mater. Interfaces
Volume 13 Issue 19 Pages 23260-23267
Keywords ORGANIC SEMICONDUCTORS; SOLAR-CELLS; CATALYSIS; TRANSPORT; PROGRESS; FILMS; RAMAN
Abstract Molecular p-type electrical dopants have been proven useful to fine-tune the optoelectronic properties of bulk organic semiconductors and their interfaces. Here, the volume in polymer films and its role in solution-based electrical p-type doping using phosphomolybdic acid (PMA) are studied. The polymer film volume was controlled using two approaches. One is based on heating both the PMA solution and the film prior to immersion. The second is based on coating the polymer film with a liquid blend that contains the PMA solution and a swelling solvent. 31P NMR and FTIR experiments indicate that the Keggin structure appears to be preserved throughout the doping process. Results show that increasing the polymer volume facilitates the infiltration of the PMA Keggin structure, which results in an increased electrical p-type doping level.
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ISSN 1944-8244 ISBN Medium
Area Expedition Conference
Notes WOS:000655027500116 Approved
Call Number UAI @ alexi.delcanto @ Serial 1382
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Author Chang, Y.C.; Larrain, F.A.; Fuentes-Hernandez, C.; Park, Y.; Kippelen, B.
Title Solution-based electrical doping of organic photovoltaics with non-fullerene acceptors facilitated by solvent vapor pre-treatment Type
Year 2024 Publication (up) AIP Advances Abbreviated Journal AIP Advances
Volume 14 Issue 1 Pages 015247
Keywords SEMICONDUCTING POLYMER-FILMS; EFFICIENCY
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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Series Volume Series Issue Edition
ISSN 2158-3226 ISBN Medium
Area Expedition Conference
Notes WOS:001151322100004 Approved
Call Number UAI @ alexi.delcanto @ Serial 1943
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Author Nam, M.; Park, Y.; Lee, C.; Kim, G.; Larrain, F.A.; Fuente-Hernandez, C.; Ko, D.H.; Kippelen, B.
Title Single-layer organic photovoltaics fabricated via solution-based electrical doping of ternary bulk heterojunction films Type
Year 2023 Publication (up) Chemical Engineering Journal Abbreviated Journal Chem. Eng. J.
Volume 466 Issue Pages 143340
Keywords Organic photovoltaics; Single -layer geometry; Electrical doping; Phosphomolybdic acid; Ternary bulk heterojunction; Indoor energy harvesting
Abstract The commercial viability of organic photovoltaics (OPVs) can be improved by simplifying their device geometry and easing fabrication complexity. Here, we demonstrate that solution-based p-type electrical doping of ternary bulk heterojunction (BHJ) films, which comprise 2 donor polymers and 1 fullerene acceptor (2D:1A), enables the realization of efficient single-layer OPVs. Systematic and detailed investigations of the optoelectronic charac-teristics of films with varying donor ratios, and their photovoltaic performance, demonstrate p-type electrical doping via post-process immersion into a 12-molybdophosphoric acid hydrate (PMA) solution, resulting in a reduced trap density and charge recombination without significantly changing the BHJ morphology. Further-more, PMA doping of films comprising optimized ternary blend compositions and polyethylenimine enables the demonstration of single-layer OPVs with economic top electrode metals and a high level of performance under outdoor and indoor illumination conditions. These PMA-doped 2D:1A BHJ films are an attractive platform to reduce the efficiency-cost gap and accelerate the commercialization of OPVs for emerging applications.
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ISSN 1385-8947 ISBN Medium
Area Expedition Conference
Notes WOS:001007214500001 Approved
Call Number UAI @ alexi.delcanto @ Serial 1823
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Author Chang, Y.C.; Larrain, F.A.; Fuentes-Hernandez, C.; Park, Y.; Kippelen, B.
Title Inverted organic tandem solar cells with a charge recombination stack employing spatially confined p-type electrical doping Type
Year 2023 Publication (up) Journal of Applied Physics Abbreviated Journal J. Appl. Phys.
Volume 134 Issue 9 Pages 095502
Keywords SEMICONDUCTING POLYMER-FILMS; LAYER
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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ISSN 0021-8979 ISBN Medium
Area Expedition Conference
Notes WOS:001063559900006 Approved
Call Number UAI @ alexi.delcanto @ Serial 1890
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Author Park, Y.; Fuentes-Hernandez, C.; Kim, K.; Chou, W.F.; Larrain, F.A.; Graham, S.; Pierron, O.N.; Kippelen, B.
Title Skin-like low-noise elastomeric organic photodiodes Type
Year 2021 Publication (up) Sciences Advances Abbreviated Journal Sci. Adv.
Volume 7 Issue 51 Pages eabj6565
Keywords MECHANICAL-PROPERTIES; POLYMER
Abstract Stretchable optoelectronics made of elastomeric semiconductors could enable the integration of intelligent systems with soft materials, such as those of the biological world. Organic semiconductors and photodiodes have been engineered to be elastomeric; however, for photodetector applications, it remains a challenge to identify an elastomeric bulk heterojunction (e-BHJ) photoactive layer that combines a low Young's modulus and a high strain at break that yields organic photodiodes with low electronic noise values and high photodetector performance. Here, a blend of an elastomer, a donor-like polymer, and an acceptor-like molecule yields a skin-like e-BHJ with a Young's modulus of a few megapascals, comparable to values of human tissues, and a high strain at break of 189%. Elastomeric organic photodiodes based on e-BHJ photoactive layers maintain low electronic noise current values in the tens of femtoamperes range and noise equivalent power values in the tens of picowatts range under at least 60% strain.
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Series Volume Series Issue Edition
ISSN 2375-2548 ISBN Medium
Area Expedition Conference
Notes WOS:000730600400021 Approved
Call Number UAI @ alexi.delcanto @ Serial 1508
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Author Arango Hoyos, B.E.; Franco Osorio, H.; Valencia Gomez, E.K.; Guerrero Sanchez, J.; Del Canto Palominos, A.P.; Larrain, F.A.; Prias Barragan, J.J.
Title Exploring the capture and desorption of CO2 on graphene oxide foams supported by computational calculations Type
Year 2023 Publication (up) Scientific Reports Abbreviated Journal Sci. Rep.
Volume 13 Issue 1 Pages 14476
Keywords CARBON-DIOXIDE; AB-INITIOFLUE-GAS; ADSORPTION; AIR; SEPARATION; SILICA; ADSORBENT; EXTRACTION; SORBENTS
Abstract In the last decade, the highest levels of greenhouse gases (GHG) in the atmosphere have been recorded, with carbon dioxide (CO2) being one of the GHGs that most concerns mankind due to the rate at which it is generated on the planet. Given its long time of permanence in the atmosphere (between 100 to 150 years); this has deployed research in the scientific field focused on the absorption and desorption of CO2 in the atmosphere. This work presents the study of CO2 adsorption employing

materials based on graphene oxide (GO), such as GO foams with different oxidation percentages (3.00%, 5.25%, and 9.00%) in their structure, obtained via an environmentally friendly method. The characterization of CO2 adsorption was carried out in a closed system, within which were placed the GO foams and other CO2 adsorbent materials (zeolite and silica gel). Through a controlled chemical reaction, production of CO2 was conducted to obtain CO2 concentration curves inside the system and calculate from these the efficiency, obtained between 86.28 and 92.20%, yield between 60.10 and 99.50%, and effectiveness of CO2 adsorption of the materials under study. The results obtained suggest that GO foams are a promising material for carbon capture and the future development of a new clean technology, given their highest CO2 adsorption efficiency and yield.
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Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 2045-2322 ISBN Medium
Area Expedition Conference
Notes WOS:001088987000021 Approved
Call Number UAI @ alexi.delcanto @ Serial 1857
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