“Popping the Ion-Basket”: Enhancing Thermoelectric Performance of Conjugated Polymers by Blending with Latently Dissociable Perovskite Quantum Dots

IF 14.3 1区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Hansol Lee, Hoimin Kim, Haedam Jin, Seungju Kang, Tae Woong Yoon, Dongki Lee, Guobing Zhang, Min Kim, Boseok Kang
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Abstract

A novel additive method to boost the Seebeck coefficient of doped conjugated polymers without a significant loss in electrical conductivity is demonstrated. Perovskite (CsPbBr3) quantum dots (QDs) passivated by ligands with long alkyl chains are mixed with a conjugated polymer in a solution phase to form polymer-QD blend films. Solution sequential doping of the blend film with AuCl3 solution not only doped the conjugated polymer but also decomposed the QDs, resulting in a doped conjugated polymer film embedded with separated ions dissociated from the QDs. For the doped polymer-molten QD blend films with the optimal QD content, it is found that a greatly enhanced Seebeck coefficient is achieved compared to that of the doped polymer film without QDs, while the doping level and electrical conductivity are not significantly reduced by the QD incorporation. Consequently, the power factor is enhanced, reaching a remarkably high value of up to 401.9 µW m−1 K−2 (≈155% increase with the QDs). The applicability of this method to a variety of conjugated polymers is also demonstrated. The enhancement in the Seebeck coefficient is attributed to ion-induced local variations in the polymer work function, which generates an internal energy barrier for charge transport and causes an energy filtering effect.

Abstract Image

“打开离子篮”:通过与潜在可解离钙钛矿量子点共混提高共轭聚合物的热电性能。
提出了一种提高掺杂共轭聚合物塞贝克系数而不显著降低其导电性的新方法。用长烷基链配体钝化的钙钛矿(CsPbBr3)量子点(QDs)与共轭聚合物在溶液中混合,形成聚合物- qd共混膜。共混膜与AuCl3溶液的溶液序贯掺杂不仅掺杂了共轭聚合物,而且分解了量子点,使得掺杂的共轭聚合物膜中嵌入了与量子点解离的分离离子。对于QD含量最佳的掺杂聚合物-熔融QD共混膜,发现与未掺杂QD的聚合物膜相比,Seebeck系数大大提高,而掺杂水平和电导率并未因QD的掺入而显著降低。因此,功率因数得到增强,达到高达401.9µW m-1 K-2的非常高的值(随量子点增加≈155%)。还证明了该方法对各种共轭聚合物的适用性。塞贝克系数的增强归因于离子诱导的聚合物功函数的局部变化,这产生了电荷传输的内部能垒,并引起能量过滤效应。
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来源期刊
Advanced Science
Advanced Science CHEMISTRY, MULTIDISCIPLINARYNANOSCIENCE &-NANOSCIENCE & NANOTECHNOLOGY
CiteScore
18.90
自引率
2.60%
发文量
1602
审稿时长
1.9 months
期刊介绍: Advanced Science is a prestigious open access journal that focuses on interdisciplinary research in materials science, physics, chemistry, medical and life sciences, and engineering. The journal aims to promote cutting-edge research by employing a rigorous and impartial review process. It is committed to presenting research articles with the highest quality production standards, ensuring maximum accessibility of top scientific findings. With its vibrant and innovative publication platform, Advanced Science seeks to revolutionize the dissemination and organization of scientific knowledge.
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