Hwang, Seongkwon Jeong, Inho Park, Juhyung Kim, Jae-Keun Kim, Heesuk Lee, Takhee Kwak, Jeonghun Chung, Seungjun 2024-01-19T17:30:46Z 2024-01-19T17:30:46Z 2021-09-05 2020-06-10 1944-8244 https://pubs.kist.re.kr/handle/201004/118522 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-mu m-thick PEDOT:PSS layers with a high degree of design freedom, resulting in a significantly reduced sheet resistance of 16 Omega sq(-1) 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 x 10(-2) to 2.77 x 10(-2) Omega cm(2). 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. English American Chemical Society ENERGY PEDOTPSS FILMS POWER CONDUCTIVITY PARAMETERS POLYMERS SOLVENT LAYER Enhanced Output Performance of All-Solution-Processed Organic Thermoelectrics: Spray Printing and Interface Engineering Article 10.1021/acsami.0c04550 1 ACS Applied Materials & Interfaces, v.12, no.23, pp.26250 - 26257 ACS Applied Materials & Interfaces 12 23 26250 26257 scie scopus 000541679900076 2-s2.0-85086345831 Nanoscience & Nanotechnology Materials Science, Multidisciplinary Science & Technology - Other Topics Materials Science Article ENERGY PEDOTPSS FILMS POWER CONDUCTIVITY PARAMETERS POLYMERS SOLVENT LAYER organic thermoelectrics flexible inkjet printing contact resistance PEDOT:PSS interface engineering