Ultrafast transient absorption measurements of photocarrier dynamics in PdSe2

Li, Guili; Zhang, Xiaoxian; Wang, Yongsheng; Bai, Zhiying; Zhao, Hui; He, Jiaqi; He, Dawei

doi:10.1039/d3nr03173j

Ultrafast transient absorption measurements of photocarrier dynamics in PdSe₂

Journal Article · Wed Aug 30 00:00:00 EDT 2023 · Nanoscale

DOI:https://doi.org/10.1039/d3nr03173j· OSTI ID:2242383

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Beijing Jiaotong University (China); The University of Kansas
Beijing Jiaotong University (China)
University of Kansas, Lawrence, KS (United States)
Beijing University of Chemical Technology (China)

We investigate the photocarrier dynamics in bulk PdSe₂, a layered transition metal dichalcogenide with a novel pentagonal structure and unique electronic and optical properties. Using femtosecond transient absorption microscopy, we study the behavior of photocarriers in mechanically exfoliated bulk PdSe₂ flakes at room temperature. By employing a 400 nm ultrafast laser pulse, electron–hole pairs are generated, and their dynamics are probed using an 800 nm detection pulse. Our findings reveal that the lifetime of photocarriers in bulk PdSe₂ is approximately 210 ps. Furthermore, by spatially resolving the differential reflection signal, we determine a photocarrier diffusion coefficient of about 7.3 cm² s^–1. Based on these results, we estimate a diffusion length of around 400 nm and a photocarrier mobility of approximately 300 cm² V^–1 s^–1. Furthermore, these results shed light on the ultrafast optoelectronic properties of PdSe₂, offer valuable insights into photocarriers in this emerging material, and enable design of high-performance optoelectronic devices based on PdSe₂.

View Accepted Manuscript (DOE)

Research Organization:: University of Kansas, Lawrence, KS (United States)

Sponsoring Organization:: Beijing Natural Science Foundation; National Natural Science Foundation of China; USDOE

Grant/Contract Number:: SC0020995

OSTI ID:: 2242383

Alternate ID(s):: OSTI ID: 1998015

Journal Information:: Nanoscale, Journal Name: Nanoscale Journal Issue: 36 Vol. 15; ISSN 2040-3364

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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