Ultra-flexible organic-inorganic hybrid Bi2Te3 thin films for thermoelectric generators

IF 8.3 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Acta Materialia Pub Date : 2025-03-24 DOI:10.1016/j.actamat.2025.120971

Dong Yang , Ning Chen , Mohammad Nisar , Zilong Zhang , Fu Li , Mazhar Hussain Danish , Hongli Ma , Guangxing Liang , Xianghua Zhang , Yue-Xing Chen , Zhuang-Hao Zheng

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Abstract

Achieving high thermoelectric (TE) performance and flexibility is essential for wearable electronics. Here, an organic-inorganic hybrid strategy incorporating methylammonium lead iodide (MAPbI₃) into Bi₂Te₃ thin films enhances both TE and mechanical properties. Pb/I incorporate into Bi₂Te₃ lattice, improving electrical conductivity via enhanced carrier transport and moderate doping effects. Meanwhile, amorphous phases derived from MA-related species strengthen phonon scattering, reducing κ_l+κ_bi from 1.1 Wm^-1K^-1 to 0.1 Wm^-1K^-1. As a result, the zT value improves from 0.08 to 0.94 at 250 °C. Moreover, the amorphization effect induced by the amorphous inclusions enhances flexibility by reducing the Young's modulus, yielding a resistance change of <7 % (ΔR/R₀) after bending. Specifically, the 0.6 wt. % sample exhibits only a 2.5 % resistance change after 5000 bending cycles. Finally, a flexible TE generator fabricated with hybrid films and Ag electrodes delivers a high output power of 35.3 nW under a 20 °C temperature gradient, highlighting the potential of this hybrid approach for wearable electronics.

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来源期刊

Acta Materialia 工程技术-材料科学：综合

CiteScore

16.10

自引率

8.50%

发文量

801

审稿时长

53 days

期刊介绍： Acta Materialia serves as a platform for publishing full-length, original papers and commissioned overviews that contribute to a profound understanding of the correlation between the processing, structure, and properties of inorganic materials. The journal seeks papers with high impact potential or those that significantly propel the field forward. The scope includes the atomic and molecular arrangements, chemical and electronic structures, and microstructure of materials, focusing on their mechanical or functional behavior across all length scales, including nanostructures.