Research Project: Sezyum Kursun Halojenür Perovskit Kuantu
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Contributors
Funders
ID
TB.00678
Authors
Peighambardoust, Naeimeh Sadat
Researcher
Publications
Lead halide perovskite quantum dots for photovoltaics and photocatalysis: a review
(American Chemical Society (ACS), 2022) Aydemir, Umut; Peighambardoust, Naeimeh Sadat; Sadeghi, Ebrahim; Department of Chemistry; Graduate School of Sciences and Engineering; KUBAM (Koç University Boron and Advanced Materials Application and Research Center); Yes; College of Sciences; GRADUATE SCHOOL OF SCIENCES AND ENGINEERING; Research Center
Lead halide-based perovskite quantum dots (PQDs) have recently emerged as an important class of nanocrystal (NC) materials for optoelectronic and photoelec-trochemical applications. Thanks to their intriguing features including tunable band gap, narrow emission, high charge carrier mobility, remarkable light-absorbing factors, and long charge diffusion length, there has been a surge in research on lead halide-based PQDs and their applications. In this review, we showcase the fundamentals of PQDs and two principal applications including PQD solar cells (PQDSCs) and photocatalytic conversion. First, a thorough discussion on PQDSCs, their structure, surface treat-ment, and interface engineering along with their recent progress are presented. It is highlighted that the improvement of the efficiency of PQDSCs from below 10% to beyond 16% in a matter of a few years has turned them into promising candidates for future SC applications. Subsequently, the application of PQDs in photocatalytic reactions such as hydrogen production, CO2 reduction, and organic compounds' degradation is summarized. Not to mention that, despite the remarkable properties of PQDs in SCs and photocatalysis, the inferior stability of PV devices based thereon under operation as well as their poor tolerance under air, water, light, and heat impede their widespread application. For this, the practical efforts and possible solutions are extensively addressed. Finally, an outlook is provided, addressing further merits, and demerits of each application as well as prospective opportunities.
Survey of synergistically doped CsPbI3 quantum dots for LED applications
(American Chemical Society, 2024) Aydemir, Umut; Naziri, Pouriya; Nizamoğlu, Sedat; Önal, Asım; Peighambardoust, Naeimeh Sadat; Simon, Paul; Graduate School of Sciences and Engineering; Department of Electrical and Electronics Engineering; Department of Chemistry; KUBAM (Koç University Boron and Advanced Materials Application and Research Center); Yes; College of Engineering; College of Sciences; Research Center; GRADUATE SCHOOL OF SCIENCES AND ENGINEERING
In recent years, colloidal quantum dots (QDs) derived from inorganic halide perovskites have shown great promise in optoelectronic applications. Despite their promising optical properties, the full potential of CsPbI3 QDs is significantly undermined by high surface trap densities and poor environmental stability. To address these challenges, this research focuses on an innovative approach involving synergetic Co2+ doping of CsPbI3 QDs and I-/Cl- ion passivation. Co2+ doping is achieved by utilizing various dopant sources such as CoI2, CoCl2 and mixed CoI2/CoCl2 The anions from CoCl(2)and CoI2 occupy iodide vacancies, thereby reducing nonradiative recombination. The optimized composition, CsPb(0.9)5Co(0.05)I(3) QDs with mixed CoI2/CoCl(2)( )doping, exhibits exceptionally low trap density and superior stability. The superior efficacy of mixed doping compared to sole CoCl2 doping suggests the complementary action of I- ions (from CoI2) along with Cl- ions (from CoCl2) in passivating surface defects. Optimized CsPb(0.9)5Co(0.05)I(3) QDs demonstrate a significant boost in photoluminescence (PL) performance and stability, achieving an exceptional 98.86% PL quantum efficiency while maintaining stability for over two months under UV light exposure. Integration of the optimized QDs into LED devices yields an outstanding external quantum efficiency (EQE) of 34.6%, showcasing their promising potential for efficient lighting applications.
