Controlling Molecular Orientation of Naphthalenediimide-Based Polymer Acceptors for High Performance All-Polymer Solar Cells
- Authors
- Jung, Jihye; Lee, Wonho; Lee, Changyeon; Ahn, Hyungju; Kim, Bumjoon J.
- Issue Date
- Aug-2016
- Publisher
- WILEY-V C H VERLAG GMBH
- Keywords
- all-polymer solar cells; molecular orientation; molecular weight; n-type conjugated polymer; naphthalenediimide
- Citation
- ADVANCED ENERGY MATERIALS, v.6, no.15
- Journal Title
- ADVANCED ENERGY MATERIALS
- Volume
- 6
- Number
- 15
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/64175
- DOI
- 10.1002/aenm.201600504
- ISSN
- 1614-6832
1614-6840
- Abstract
- Molecular orientation, with respect to donor/acceptor interface and electrodes, plays a critical role in determining the performance of all-polymer solar cells (all-PSCs), but is often difficult to rationally control. Here, an effective approach for tuning the molecular crystallinity and orientation of naphthalenediimide-bithiophene-based n-type polymers (P(NDI2HD-T2)) by controlling their number average molecular weights (M-n) is reported. A series of P(NDI2HD-T2) polymers with different M-n of 13.6 (PL), 22.9 (PM), and 49.9 kg mol(-1) (PH) are prepared by changing the amount of end-capping agent (2-bromothiophene) during polymerization. Increasing the M-n values of P(NDI2HD-T2) polymers leads to a remarkable shift of dominant lamellar crystallite textures from edge-on (PL) to face-on (PH) as well as more than a twofold increase in the crystallinity. For example, the portion of face-on oriented crystallites is dramatically increased from 21.5% and 46.1%, to 78.6% for PL, PM, and PH polymers. These different packing structures in terms of the molecular orientation greatly affect the charge dissociation efficiency at the donor/acceptor interface and thus the short-circuit current density of the all-PSCs. All-PSCs with PTB7-Th as electron donor and PH as electron acceptor show the highest efficiency of 6.14%, outperforming those with PM (5.08%) and PL (4.29%).
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Collections - College of Engineering > School of Chemical Engineering and Material Science > 1. Journal Articles
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