期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 12, 期 1, 页码 680-685出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.0c03461
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- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy within the Cluster of Excellence PhoenixD (EXC 2122) [390833453]
- Caroline Herschel program of the Leibniz Universitat Hannover
Colloidal PbS nanoplatelets (NPLs) with a cubic crystal structure were studied for their photoexcited excitons characteristics and dynamics, with their photoluminescence quantum yield significantly enhanced after CdCl2 treatment. Surface treatment and exciton-phonon interactions were utilized to control and improve the optical properties of IV-VI semiconductor NPLs.
Colloidal PbS nanoplatelets (NPLs) are highly interesting materials for nearinfrared optoelectronic applications. We use ultrafast transient optical absorption spectroscopy to study the characteristics and dynamics of photoexcited excitons in ultrathin PbS NPLs with a cubic crystal structure. NPLs are synthesized at near room temperature from lead oleate and thiourea precursors; they show an optical absorption onset at 680 nm (1.8 eV) and photoluminescence at 720 nm (1.7 eV). By postsynthetically treating PbS NPLs with CdCl2, their photoluminescence quantum yield is strongly enhanced from 1.4% to 19.4%. The surface treatment leads to an increased lead to sulfur ratio in the structures and associated reduced nonradiative recombination. Additionally, exciton-phonon interactions in pristine and CdCl2 treated NPLs at frequencies of 1.96 and 2.04 THz are apparent from coherent oscillations in the transient absorption spectra. This study is an important step forward in unraveling and controlling the optical properties of IV-VI semiconductor NPLs.
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