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Title: | Homocoupling Defects of a Small Donor Molecule for Organic Photovoltaics: Quantification of the Eutectic State Diagram by Rapid Heat-Cool Differential Scanning Calorimetry | Authors: | Van den Brande, Niko Defour, Maxime Liu, Zhen VERSTAPPEN, Pieter Nies, Erik MAES, Wouter Van Assche, Guy Van Mele, Bruno |
Issue Date: | 2019 | Publisher: | AMER CHEMICAL SOC | Source: | JOURNAL OF PHYSICAL CHEMISTRY C, 123(36), p. 22634-22642 | Abstract: | The conjugated small donor molecule p-DTS(FBTTh2)(2), leading to efficient bulk heterojunction organic photovoltaic devices with PC71BM, shows a eutectic phase behavior in combination with its homocoupled analogue. Rapid heat-cool differential scanning calorimetry allows us to construct the state diagram based on (i) the endset of melting of p-DTS(FBTTh2)(2):homocoupled p-DTS(FBTTh2)(2) mixtures of different compositions, and (ii) partial integration of the melting trajectory of these mixtures by calculating the fraction of the molten pure excess phase as a function of temperature. These quantitative experimental results are supported by a theoretical calculation model based on Schroder-van Laar equations extended with an interaction function representing the interactions between the mixture's components in the liquid state. The eutectic composition around 30 wt % of homocoupled p-DTS(FBTTh2)(2) shows the lowest crystallinity (order) of all mixtures together with a maximum loss of photovoltaic efficiency. | Notes: | [Van den Brande, Niko; Defour, Maxime; Liu, Zhen; Van Assche, Guy; Van Mele, Bruno] VUB, Phys Chem & Polymer Sci FYSC, Pl Laan 2, B-1050 Brussels, Belgium. [Verstappen, Pieter; Maes, Wouter] Hasselt Univ, DSOS, Inst Mat Res IMO IMOMEC, Univ Campus,Agoralaan 1, B-3590 Diepenbeek, Belgium. [Verstappen, Pieter; Maes, Wouter] IMEC, Associated Lab IMOMEC, Wetenschapspk 1, B-3590 Diepenbeek, Belgium. [Nies, Erik] Katholieke Univ Leuven, Polymer Chem & Mat, Dept Chem, Celestijnenlaan 200f, B-3001 Leuven, Belgium. | Document URI: | http://hdl.handle.net/1942/29881 | ISSN: | 1932-7447 | e-ISSN: | 1932-7455 | DOI: | 10.1021/acs.jpcc.9b06336 | ISI #: | 000486360900085 | Rights: | 2019 American Chemical Society | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2020 |
Appears in Collections: | Research publications |
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