Dramatically enhanced performances and ideally controlled nano-morphology via co-solvent processing in low bandgap polymer solar cells
- Authors
- Kim, Yu Jin; Jang, Woogsik; Ahn, Sunyong; Park, Chan Eon; Wang, Dong Hwan
- Issue Date
- Jul-2016
- Publisher
- ELSEVIER SCIENCE BV
- Keywords
- Bulk heterojunction solar cell; Polymer solar cell; Co-solvent; Nanoscale morphology; Phase separation
- Citation
- ORGANIC ELECTRONICS, v.34, pp 42 - 49
- Pages
- 8
- Journal Title
- ORGANIC ELECTRONICS
- Volume
- 34
- Start Page
- 42
- End Page
- 49
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/6749
- DOI
- 10.1016/j.orgel.2016.04.010
- ISSN
- 1566-1199
1878-5530
- Abstract
- The device performance of photovoltaics with a polymer: fullerene bulk heterojunction (BHJ) structure, consisting of DT-PDPP2T-TT donor polymer and poly(3-hexylthiophene):[6,6] phenyl-C-61-butyric acid methyl ester (PC61BM) acceptor compound, was investigated as a function of co-solvent composition. An enhancement of the photocurrent density and fill factor is observed in diodes made by spin-coating with chloroform mixed with ortho-dichlorobenzene, which allows a significantly higher device efficiency of 5.55% compared to diodes made from neat chloroform (efficiency = 3.61%). To clarify the role of the co-solvent, we investigated the nanoscale morphology with AFM, TEM and 2D-GIWAXS techniques and also the free-charge carrier mobility via space-charge limited current theory. We obtained the result that, under such supersaturated conditions, co-solvents induce increased polymer crystalline aggregation into a 3D phase structure and boost charge-carrier transport characteristics. This provides a rational basis for the development of ideally-controlled BHJ films that yield efficient DT-PDPP2T-TT:PCBM solar cells. Therefore, carefully selecting solvent mixtures provides an approach toward efficient low bandgap polymer solar cells. (C) 2016 Elsevier B.V. All rights reserved.
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