Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 9, Pages 11151-11165Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c00414
Keywords
single-wall carbon nanotubes (SWCNTs); high-temperature organic thermoelectric generator; printed thermoelectric generator; wearable thermoelectric generator; flexible thermoelectric generator
Funding
- [769140]
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The study introduces the fabrication process of a highly efficient fully printed all-carbon organic thermoelectric generator (OTEG) that does not require metallic junctions. The novel OTEG exhibits outstanding flexibility and stability with exceptional power output, making it possible to operate at high temperatures up to 200 degrees Celsius. The device has been successfully designed with superior thermoelectric properties, providing opportunities for large-scale manufacturing of efficient flexible OTEGs.
In this study, we introduce the fabrication process of a highly efficient fully printed all-carbon organic thermoelectric generator (OTEG) free of metallic junctions with outstanding flexibility and exceptional power output, which can be conveniently and rapidly prepared through ink dispensing/printing processes of aqueous and low-cost CNT inks with a mask-assisted specified circuit architecture. The optimal p-type and n-type films produced exhibit ultrahigh power factors (PFs) of 308 and 258 mu W/mK(2), respectively, at Delta T = 150 K (T-HOT = 175 degrees C) and outstanding stability in air without encapsulation, providing the OTEG device the ability to operate at high temperatures up to 200 degrees C at ambient conditions (1 atm, relative humidity: 50 +/- 5% RH). We have successfully designed and fabricated the flexible thermoelectric (TE) modules with superior TE properties of p-type and n-type SWCNT films resulting in exceptionally high performance. The novel design OTEG exhibits outstanding flexibility and stability with attained TE values among the highest ever reported in the field of organic thermoelectrics, that is, open-circuit voltage V-OC = 1.05 V and short-circuit current I-SC = 1.30 mA at Delta T = 150 K (T-HOT = 175 degrees C) with an internal resistance of R-TEG = 806 Omega, generating a 342 mu W power output. It is also worth noting the remarkable PFs of 145 and 127 mu W/mK(2) for the p-type and n-type films, respectively, at room temperature. The fabricated device is highly scalable, providing opportunities for printable large-scale manufacturing/industrial production of highly efficient flexible OTEGs.
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