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n-Type Thermoelectric Materials Based on CuTCNQ Nanocrystals and CuTCNQ Nanorod Arrays

We report the synthesis and thermoelectric (TE) performance of organometallic coordination polymers, including copper 7,7,8,8-tetracyano-p-quinodimethane nanocrystals (NC-CuTCNQ) and thin films of CuTCNQ nanorod arrays (NrA-CuTCNQ). The characterization of NC-CuTCNQ was carried out with the compressed samples. For NrA-CuTCNQ films, the TE properties were investigated with a hybrid Au/Cu/CuTCNQ/Au architecture along the direction either vertical or parallel to the film surface and obviously anisotropic behaviors were observed. We found that CuTCNQ can be a potential n-type material for future application in thermoelectric devices with a power factor of 1.5 uW  m-1K-2, accompanied by a high Seebeck coefficient of -632uVK-1 at 370K. In odrder to optimize its TE performance, a cousin molecule 2,3,5,6 tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4TCNQ) was mixed with TCNQ reacted with Cul. We found that the CuTCNQ blend possessed the highest power factor of 2.5 uWm-1K-1 with a 1 mol% blend ratio of F4TCNQ (related to TCNQ) at 370K.

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