Correlation between Phase-Separated Domain Sizes of Active Layer and Photovoltaic Performances in All-Polymer Solar Cells
- Authors
- Lee, Changyeon; Li, Yuxiang; Lee, Wonho; Lee, Youngmin; Choi, Joonhyeong; Kim, Taesu; Wang, Cheng; Gomez, Enrique D.; Woo, Han Young; Kim, Bumjoon J.
- Issue Date
- 26-7월-2016
- Publisher
- AMER CHEMICAL SOC
- Citation
- MACROMOLECULES, v.49, no.14, pp.5051 - 5058
- Indexed
- SCIE
SCOPUS
- Journal Title
- MACROMOLECULES
- Volume
- 49
- Number
- 14
- Start Page
- 5051
- End Page
- 5058
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/88035
- DOI
- 10.1021/acs.macromol.6b01069
- ISSN
- 0024-9297
- Abstract
- The control of the bulk-heterojunction (BHJ) morphology in polymer/polymer blends remains a critical hurdle for optimizing all-polymer solar cells (all-PSCs). The relationship between donor/acceptor phase separation, domain size, and the resulting photovoltaic characteristics of PDFQx3T and P(NDI2OD-T2)-based all-PSCs was investigated. We varied the film-processing solvents (chloroform, chlorobenzene, o-dichlorobenzene, and p-xylene), thereby manipulating the phase separation of all-polymer blends with the domain size in the range of 30-300 nm. The different volatility and solubility of the solvents strongly influenced the aggregation of the polymers and the BHJ morphology of polymer blends. Domain sizes of all-polymer blends were closely correlated with the short-circuit current density (J(SC)) of the devices, while the open-circuit voltage (0.80 V) and fill factor (0.60) were unaffected. All-PSCs with the smallest domain size of similar to 30 nm in the active layer (using chloroform), which is commensurate with the domain size of highly efficient polymer/fullerene solar cells, had the highest J(SC) and power conversion efficiency of 5.11% due to large interfacial areas and efficient exciton separation. Our results suggest that the BHJ morphology was not fully optimized for most of the previous high-performance all-PSC systems, and their photovoltaic performance can be further improved by fine-engineering the film morphology, i.e., domain size, domain purity, and polymer packing structure.
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