Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 133, Issue 24, Pages 9262-9265Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja203464n
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Funding
- ISEN
- NSF [0955612]
- Sony Corporation
- Northrop Grumman Corporation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0955612] Funding Source: National Science Foundation
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Graphene oxide (GO) can be viewed as a two-dimensional, random diblock copolymer with distributed nano-size graphitic patches and highly oxidized domains, thus capable of guiding the assembly of other materials through both pi-pi stacking and hydrogen bonding. Upon mixing GO and conducting polymer poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) in water, a dispersion with dramatically increased viscosity is obtained, which turns into sticky thin films upon casting. Surprisingly, the insulating GO makes PEDOT much more conductive by altering its chain conformation and morphology. The GO/PEDOT gel can function as a metal-free solder for creating mechanical and electrical connections in organic optoelectronic devices. As a proof-of-concept, polymer tandem solar cells have been fabricated by a direct adhesive lamination process enabled by the sticky GO/PEDOT film. The sticky interconnect can greatly simplify the fabrication of organic tandem architectures, which has been quite challenging via solution processing. Thus, it could facilitate the construction of high-efficiency tandem solar cells with different combinations of solution-processable materials.
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