Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 15, Issue 28, Pages 34230-34239Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.3c05009
Keywords
conjugated polymer-metal oxide interface; hydrogen bond; electronic coupling; PEDOT; PSS; TiO2; rectification ratio; organic-inorganicdiode; hygrometry
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Hydrogen bonding is utilized to fabricate highly rectifying organic-inorganic interfaces, which demonstrate significantly higher rectification ratios compared to directly joined interfaces. These hydrogen-bonded interfaces have great potential in the design of organic electronic and optoelectronic devices.
Asymmetrically conducting interfaces are the buildingblocks ofelectronic devices. While p-n junction diodes made of seminalinorganic semiconductors with rectification ratios close to the theoreticallimits are routinely fabricated, the analogous organic-inorganicand organic-organic interfaces are still too leaky to affordfunctional use. We report fabricating highly rectifying organic-inorganicinterfaces by forming water-mediated hydrogen bonds between the hydrophilicsurfaces of a hole-conducting polymer anode and a polycrystallinen-type metal oxide cathode. These hydrogen bonds simultaneously strengthenthe anode-cathode electronic coupling, facilitate the matchingbetween their incompatible surface structures, and passivate the detrimentalsurface imperfections. Compared to an analogous directly joined interface,our hydrogen-bonded Au-PEDOT:PSS-H2O-TiO2-Ti diodes demonstrate 10(5) times higher rectificationratios. These results illustrate the strong electronic coupling powerof the hydrogen bonds on a macroscopic scale and underscore the hydrogen-bondedinterfaces as the building blocks of fabricating organic electronicand optoelectronic devices. The presented interface model is anticipatedto advance designing electronic devices based on the organic-organicand organic-inorganic hetero-interfaces. Described electronicimplications of hydrogen bonding on the conductive polymer interfacesare anticipated to be impactful in the organic electronics and neuromorphicengineering.
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