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Influence of 3D morphology on the performance of all-polymer solar cells processed using environmentally benign nonhalogenated solvents

Title
Influence of 3D morphology on the performance of all-polymer solar cells processed using environmentally benign nonhalogenated solvents
Authors
Jung, HyeseungJung, A-RaJin, Seon-MiKim, SeahHeo, HyojungNguyen, Hoai Van T.Kim, Min JeAhn, PyeongkangKim, Myung HwaLee, YounguLee, Kyung-KooCho, Jeong HoLee, EunjiKim, BongSoo
DGIST Authors
Lee, Youngu
Issue Date
2020-11
Citation
Nano Energy, 77, 105106
Type
Article
Article Type
Article
Author Keywords
Environmentally benign solvent/additiveAll-polymer solar cellActive layer morphologyTEM tomographyMolecular dynamics simulation
Keywords
POWER CONVERSION EFFICIENCYLOW-BANDGAP POLYMERMOLECULAR PACKINGADDITIVE-FREEACCEPTORELECTRONDONORCRYSTALLINITYORIENTATIONSTABILITY
ISSN
2211-2855
Abstract
Advancing the photovoltaic performance of all-polymer solar cells (APSCs) requires a comprehensive understanding of the dependence of the properties of photoactive blend films on the solvents used to process them. We have studied the correlation between the morphology of PTB7-Th:PNDI2OD-T2 blend films prepared using six different processing solvents. Three-dimensional (3D) transmission electron microscopy tomography (TEMT) revealed the influence of the 3D morphology of the PTB7-Th:PNDI2OD-T2 blend films on their photovoltaic performance. The high-performing toluene (TOL)- and o-xylene (XY)-processed blend films displayed power conversion efficiencies (PCEs) of ~4%, which contained nanoscopically networked fibrous PNDI2OD-T2 polymer domains. The films processed using the other solvents exhibited partly disconnected domains or unfavorable vertical phase separation. In addition, the use of N-dimethylformamide (DMF), N,N-dimethylacetamide (DMAc), or N-methyl-2-pyrrolidone (NMP) as a solvent additive in XY solution resulted in a substantial improvement in the PCEs to 6.1%. This large enhancement was attributed to the formation of the better-interconnected narrower crystalline fibrillary structure of PNDI2OD-T2 chains with the aid of solvent additives, as clearly elucidated by 3D-TEMT imaging. This work highlights that APSCs processed from benign nonhalogenated solvents with appropriate additives can outperform APSCs processed from toxic halogenated solvents by affording a favorable blend morphology and that 3D TEMT imaging is a powerful and essential tool for characterizing the true morphology of photoactive layers. © 2020 Elsevier Ltd
URI
http://hdl.handle.net/20.500.11750/12607
DOI
10.1016/j.nanoen.2020.105106
Publisher
Elsevier BV
Related Researcher
  • Author Lee, Youngu Organic & Printed Electronics Laboratory(OPEL)
  • Research Interests OTF Solar cell; OLED; Printed Electronics; 유기박막형 태양전지
Files:
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Collection:
Department of Energy Science and EngineeringOrganic & Printed Electronics Laboratory(OPEL)1. Journal Articles


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