Browsing by Subject "Luminescent solar concentrators"
Now showing 1 - 4 of 4
Results Per Page
Sort Options
Item Open Access Dual- luminophore efficient luminescent solar concentrator fabricated by low-cost 3D printing(Institute of Physics Publishing Ltd., 2022-12-23) Ebrahimisadr, S.; Olyaeefar, Babak.; Ahmadi-kandjani, S.Luminescent Solar Concentrators (LSCs), as cost-effective optical devices for photon concentration, have been showing promising applications in photovoltaic systems. Recently, LSCs are being fabricated through different methods to improve their performance and reduce the cost of fabrication. One of the most common and traditional methods of LSC fabrication is Free Radical Polymerization. In which free radicals are formed through thermal decomposition or photolysis of radical initiators. This research work introduces 3D printed LSCs based on CsPbBr3/Cs4PbBr6 Perovskite Nanocrystals (NCs) and an organic Rhodamine b luminophore mixtures. Nowadays, 3D printing technology has a wide variety of applications in industry, medicine, education, etc. 3D printing technique due to the cheap and accessible raw materials is proved to be a facile and cost-effective method to fabricate LSCs. CsPbBr3/Cs4PbBr6 Perovskites were synthesized using a modified reverse microemulsion method. Poly Lactic Acid (PLA) granules with a luminophore concentration of 0.001 wt% were used to fabricate 3D Printer filament as a polymer for LSC fabrication. XRD, FE-SEM, and EDS analysis were applied to synthesized Perovskites to prove formation of CsPbBr3/Cs4PbBr6 Perovskites. Absorption and Photoluminescence spectrum of used luminophores in LSCs were investigated. Re-absorption effect and I–V plots of prepared LSCs were studied. The I–V plot of the attached solar cell to pristine PLA and luminophore dispersed LSCs shows that the solar cell attached to the dual-luminophore LSC is approximately 122% more efficient than the one attached to pristine PLA LSC.Item Open Access Near-Infrared-Emitting five-monolayer thick copper-doped CdSe nanoplatelets(WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2019) Sharma, Ashma; Sharma, Manoj; Güngör, Kıvanç; Olutaş, Murat; Dede, Didem; Demir, Hilmi VolkanDoped nanocrystals are instrumental to the high‐performance luminescent solar concentrators (LSCs) and the color conversion devices. Recently, copper (Cu)‐doped three and four monolayer (ML) thick CdSe nanoplatelets (NPLs) have been shown superior to the existing Cu‐doped quantum dots (QDs) for their use in LSCs. However, additional improvement in the LSC performance can be achieved by further redshifting the emission into the near‐infrared (NIR) region of electromagnetic spectrum and increasing the absorbed portion of the solar irradiation. Cu‐doping into higher thicknesses of these atomically flat NPLs (e.g., ≥5 ML) can achieve these overarching goals. However, addition of the dopant ions during the nucleation stage disturbs this high‐temperature growth process and leads to multiple populations of NPLs and QDs. Here, by carefully controlling the precursor chemistry the successful doping of Cu in five ML thick NPLs by high‐temperature nucleation doping method is demonstrated. The optimized synthesis method shows nearly pure population of doped five ML thick NPLs, which possess ≈150 nm Stokes‐shifted NIR emission with high quantum yield of 65 ± 2%. Structural, elemental, and optical studies are conducted to confirm the successful doping and understand the detailed photophysics. Finally, these materials are tested experimentally and theoretically for their performance as promising LSC materials.Item Open Access Near-unity emitting copper-doped colloidal semiconductor quantum wells for luminescent solar concentrators(Wiley-VCH Verlag, 2017) Sharma, M.; Gungor K.; Yeltik A.; Olutas M.; Guzelturk, B.; Kelestemur Y.; Erdem, T.; Delikanli S.; McBride, J. R.; Demir, Hilmi VolkanDoping of bulk semiconductors has revealed widespread success in optoelectronic applications. In the past few decades, substantial effort has been engaged for doping at the nanoscale. Recently, doped colloidal quantum dots (CQDs) have been demonstrated to be promising materials for luminescent solar concentrators (LSCs) as they can be engineered for providing highly tunable and Stokes-shifted emission in the solar spectrum. However, existing doped CQDs that are aimed for full solar spectrum LSCs suffer from moderately low quantum efficiency, intrinsically small absorption cross-section, and gradually increasing absorption profiles coinciding with the emission spectrum, which together fundamentally limit their effective usage. Here, the authors show the first account of copper doping into atomically flat colloidal quantum wells (CQWs). In addition to Stokes-shifted and tunable dopant-induced photoluminescence emission, the copper doping into CQWs enables near-unity quantum efficiencies (up to ≈97%), accompanied by substantially high absorption cross-section and inherently step-like absorption profile, compared to those of the doped CQDs. Based on these exceptional properties, the authors have demonstrated by both experimental analysis and numerical modeling that these newly synthesized doped CQWs are excellent candidates for LSCs. These findings may open new directions for deployment of doped CQWs in LSCs for advanced solar light harvesting technologies.Item Open Access Towards unimolecular luminescent solar concentrators: bodipy-based dendritic energy-transfer cascade with panchromatic absorption and monochromatized emission(2011) Bozdemir, O. A.; Erbas-Cakmak, S.; Ekiz, O. O.; Dana, A.; Akkaya, E. U.A polymer-embedded dendritic, bodipy-based panchromatic absorber with a built-in energy gradient concentrates incident solar radiation at a terminal chromophore, resulting in a monochromatized emission directed to the sides of the polymer waveguide (see picture). This particular design minimizes self-absorption losses from the peripheral antenna units with an impressive S factor of 10 000.