Directional Regulation of Photogenerated Carriers in Tin Halide Perovskites for Enhanced Thermoelectrics

IF 19.3 1区材料科学 Q1 CHEMISTRY, PHYSICAL

ACS Energy Letters Pub Date : 2024-11-04 DOI:10.1021/acsenergylett.4c02759

Ruisi Chen, Lidong Chen, Ziqi Liang

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Abstract

Metal halide perovskites hold good prospects for thermoelectric applications. Photoexcitation is manifested to effectively increase carrier density of perovskites, yet the severe carrier recombination due to the bipolar effect leads to the significant Seebeck voltage loss. Herein, we discover a remarkably photo-enhanced thermoelectric effect in FASnI₃ thin film by depositing an electron transport layer, delivering a 28-fold enhancement in thermoelectric power factor (PF). It is found that carrier recombination is greatly suppressed via directional regulation of photogenerated carrier transport, leading to a concurrent increase of electrical conductivity (σ) and Seebeck coefficient (S). Such a strategy is applicable to other compositional tin perovskite films with higher carrier and defect densities, which are however less pronounced owing to the inferior photocarriers and the restrained electron extraction. Nonetheless, we achieve a champion PF up to ∼342 μW m^–1 K^–2 in CsSnI₃ films by virtue of their outstanding σ that plays a decisive role in comparison to that of S.

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定向调节卤化锡过氧化物中的光生载流子以增强热电效应

金属卤化物过氧化物具有良好的热电应用前景。光激发可以有效地提高过氧化物的载流子密度，但双极效应导致的严重载流子重组会造成显著的塞贝克电压损失。在此，我们通过在 FASnI3 薄膜中沉积电子传输层，发现了一种显著的光增强热电效应，使热电功率因数（PF）提高了 28 倍。研究发现，通过定向调节光生载流子传输，载流子重组被大大抑制，从而同时提高了电导率（σ）和塞贝克系数（S）。这种策略也适用于载流子和缺陷密度较高的其他成分锡包晶石薄膜，但由于光载流子和电子萃取受到限制，其效果并不明显。尽管如此，我们还是凭借 CsSnI3 薄膜出色的 σ，实现了高达 ∼342 μW m-1 K-2 的冠军 PF 值。

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来源期刊

ACS Energy Letters Energy-Renewable Energy, Sustainability and the Environment

CiteScore

31.20

自引率

5.00%

发文量

469

审稿时长

1 months

期刊介绍： ACS Energy Letters is a monthly journal that publishes papers reporting new scientific advances in energy research. The journal focuses on topics that are of interest to scientists working in the fundamental and applied sciences. Rapid publication is a central criterion for acceptance, and the journal is known for its quick publication times, with an average of 4-6 weeks from submission to web publication in As Soon As Publishable format. ACS Energy Letters is ranked as the number one journal in the Web of Science Electrochemistry category. It also ranks within the top 10 journals for Physical Chemistry, Energy & Fuels, and Nanoscience & Nanotechnology. The journal offers several types of articles, including Letters, Energy Express, Perspectives, Reviews, Editorials, Viewpoints and Energy Focus. Additionally, authors have the option to submit videos that summarize or support the information presented in a Perspective or Review article, which can be highlighted on the journal's website. ACS Energy Letters is abstracted and indexed in Chemical Abstracts Service/SciFinder, EBSCO-summon, PubMed, Web of Science, Scopus and Portico.