Tuning the Frölich interactions in bismuth modified lead sulphide quantum dots to minimize the excitonic carrier energy dissipation. (8th May 2022)

• Record Type: Journal Article
• Authors: Shkir, Mohd; Muthu Mariappan, Sivalingam; Khan, Aslam; Vinoth, Elangovan; Algarni, Hamed; El‐Toni, Ahmed Mohamed; Ansari, Anees A.; Aldalbahi, Ali; Gupta, Ravindra Kumar; AlFaify, Salem
• Is Part Of: International journal of energy research. Volume 46:Number 9(2022)
• Page Start: 11914
• Page End: 11924
• Publication Date: 2022-05-08
• Subjects: bottleneck effect -- Burstein‐Moss effect -- electron‐phonon interactions -- lead sulphide (PbS) -- solar cells; Power resources -- Periodicals; Power (Mechanics) -- Periodicals; Power resources -- Research -- Periodicals; 621.042
• DOI: 10.1002/er.7961
• Languages: English
• ISSNs: 0363-907X

Abstract

Summary: The hot phonon bottleneck effect and the reduced carrier‐phonon interactions in quantum‐confined systems would lead to long‐lived excitonic carrier. Importantly, these phenomena prevent the carrier energy dissipation, and consequently improve the efficiency of optoelectronic devices like solar cells. Aiming this, the excellent sensitizing properties of bismuth modified lead sulphide (Bi:PbS) quantum dots (QDs) with reduced carrier‐phonon interactions are demonstrated. Further, the multiple excitonic transition states are probed from the derivatives of absorbance spectra. In the final section, both Fano interaction analysis and Huang‐Rhys factor confirms the minimum carrier‐phonon coupling in Bi:PbS QDs. The phonon lifetime is calculated by the Cuscó equation and the obtained results endorse that Bi:PbS QDs are excellent sensitizers for solar cell applications. Abstract : (a) Schematic representation of excitonic carrier energy dissipation through carrier‐phonon interaction in pure PbS. (b) High excitonic carrier density and minimized energy dissipation with bottleneck effect in Bi:PbS.