Hwang Seongkwon, Jeong Inho, Park Juhyung, Kim Jae-Keun, Kim Heesuk, Lee Takhee, Kwak Jeonghun, Chung Seungjun
Photo-Electronic Hybrids Research Center, Korea Institute of Science and Technology Seoul 02792, Republic of Korea.
School of Electrical Engineering, Korea University, Seoul 02841, Republic of Korea.
ACS Appl Mater Interfaces. 2020 Jun 10;12(23):26250-26257. doi: 10.1021/acsami.0c04550. Epub 2020 May 26.
We report two organocompatible strategies to enhance the output performance of all-solution-processed poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) thermoelectric generators (TEGs): introducing an additive spray printing process and functionalized polymer interlayers to reduce the module resistance. The spray printing enabled the deposition of 1-μm-thick PEDOT:PSS layers with a high degree of design freedom, resulting in a significantly reduced sheet resistance of 16 Ω sq that is closely related to the thermoelectric output performance. Also, by inserting an ultrathin silane-terminated polystyrene (PS) interlayer between the PEDOT:PSS thermoelectric layers and inkjet-printed Ag interconnects selectively, the contact resistivity extracted by the transmission line method was reduced from 6.02 × 10 to 2.77 × 10 Ω cm. We found that the PS interlayers behaved as a thin tunneling layer, which facilitated the carrier injection from the inkjet-printed Ag electrodes into the PEDOT:PSS films by field emission with an effectively lowered energy barrier. The activation energy was also extracted using the Richardson equation, resulting in a reduction of 2.59 ± 0.04 meV after the PS treatment. Scalable plastic-compatible processability and selective interface engineering enabled to demonstrate the flexible 74-leg PEDOT:PSS TEGs exhibiting the open-circuit voltage of 9.21 mV and the output power of 2.23 nW at a temperature difference of 10 K.
我们报告了两种具有器官相容性的策略，以提高全溶液处理的聚（3,4-乙撑二氧噻吩）：聚（苯乙烯磺酸盐）（PEDOT:PSS）热电发电机（TEG）的输出性能：引入添加剂喷雾印刷工艺和功能化聚合物中间层以降低模块电阻。喷雾印刷能够以高度的设计自由度沉积1μm厚的PEDOT:PSS层，从而使薄层电阻显著降低至16Ω/sq，这与热电输出性能密切相关。此外，通过在PEDOT:PSS热电层和喷墨印刷的银互连之间选择性地插入超薄硅烷封端的聚苯乙烯（PS）中间层，采用传输线法提取的接触电阻率从6.02×10降低到2.77×10Ω·cm。我们发现PS中间层起到了薄隧道层的作用，通过场发射有效地降低了能垒，促进了载流子从喷墨印刷的银电极注入到PEDOT:PSS薄膜中。还使用理查森方程提取了激活能，PS处理后激活能降低了2.59±0.04meV。可扩展的塑料兼容加工性和选择性界面工程使得能够展示出柔性74腿PEDOT:PSS TEGs，在10K的温差下开路电压为9.21mV，输出功率为2.23nW。
