Jiangxi Key Laboratory of Flexible Electronics, Jiangxi Science and Technology Normal University, Nanchang 330013, China
School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 610054, China
Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, China
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Interface control is a prominent strategy to achieve significant improvements in composites performance. A novel core/hybrid-shell strategy is proposed to efficiently control the energy matching of the inorganic/organic interface, realizing the utilization of energy filtering effect and the substantial great improvement in thermoelectric (TE) performance. Moreover, the prepared core/hybrid-shell composite films exhibit superior air-stability and flexibility, demonstrating great potential in low-power portable electronics.
Abstract
Interface control in inorganic/organic composites has always been regarded as one of the effective means to optimize their thermoelectric (TE) performance, and the past few years have witnessed its development, including carrier-energy filtering and phonon scattering. However, the energy barrier created by the band alignment at the composite interface depends on the Fermi level difference between the organic and inorganic components, which is difficult to be controlled by the common means. Herein, a core/hybrid-shell strategy aiming for efficient interface control is proposed to tune the energy barrier of the inorganic/organic core/shell nanowire interface. The Fermi level of hybrid-shell can be effectively controlled by separating the charge carriers compared to the single-shell composites. The energy barrier of the core/hybrid-shell interface is tuned to an appropriate position, and the energy filtering effect is utilized, resulting in a substantial improvement in power factor and reduction in thermal conductivity for the prepared core/hybrid-shell composites with good air-stability and flexibility. Moreover, both the flexible p type and p-n type TE devices based on the prepared core/hybrid-shell films yield excellent output properties with the maximum power densities of 41 and 45 μW·cm−2 at a temperature difference of ca. 30 K, respectively. This study provides a novel strategy to improve the TE performance of the inorganic/organic composites, displaying great potential for low-power wearable electronics.
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