Structure and Doping Optimization of IDT-Based Copolymers for Thermoelectrics

Abstract

<jats:p>π-conjugated backbones play a fundamental role in determining the thermoelectric (TE) properties of organic semiconductors. Understanding the relationship between the structure–property–function can help us screen valuable materials. In this study, we designed and synthesized a series of conjugated copolymers (P1, P2, and P3) based on an indacenodithiophene (IDT) building block. A copolymer (P3) with an alternating donor–acceptor (D-A) structure exhibits a narrower band gap and higher carrier mobility, which may be due to the D-A structure that helps reduce the charge carrier transport obstacles. In the end, its power factor reaches 4.91 μW m−1 K−2 at room temperature after doping, which is superior to those of non-D-A IDT-based copolymers (P1 and P2). These results indicate that moderate adjustment of the polymer backbone is an effective way to improve the TE properties of copolymers.</jats:p>

Impact of Molecular Weight on Molecular Doping Efficiency of Conjugated Polymers and Resulting Thermoelectric Performances

“…In comparison, absorptions at 322 and 364 nm, and 960 and >1300 nm increased drastically, which can be attributed to the absorption peaks of FeCl 4 and the radical cation (polaron)/dication (bipolaron) of PDFD-T, respectively. [32][33][34] We note that similar trends of UV-vis-NIR spectral changes were also observed for the d-PDFD-TT(L) and d-PDFD-DTT(L) films. These results indicate that FeCl 3 can effectively dope the PDFD-T, PDFD-TT, and PDFD-DTT films by the sequential doping method, resulting in the generation of free charge carriers, that is, polarons and bipolarons.…”

Degradable semiconducting polymers without long-range order for on-demand degradation of transient electronics

“…S38 and S39, ESI †). [41][42][43] In toluene solution, doping behavior was not observed on short timescales (o1 day), and the degradable IDT-based polymers were measured to have completely degraded within only 5 min. (Fig.…”

Toward Sustainable Wearable Electronic Textiles

“…(a) Conductive polymer doping for degradation: (i) cardiac progenitor cell synergy with the conductive polymer (PPy) surface is critical for optimizing cardiac tissue regeneration . (ii) Conductive polymer (PANI) doping with FeCl 3 . (b) Disintegration, degradability, and biocompatibility of PDPP-PD: (i) Illustration depicting the materials and device structure used in total disintegration electronics with iron electrodes.…”

“… 225 (ii) Conductive polymer (PANI) doping with FeCl 3 . 226 (b) Disintegration, degradability, and biocompatibility of PDPP-PD: (i) Illustration depicting the materials and device structure used in total disintegration electronics with iron electrodes. (ii) Images of a device disintegrating at different phases.…”