نتایج جستجو برای: quantum dot solar cell
تعداد نتایج: 2079047 فیلتر نتایج به سال:
سنسورهای مادون قرمز در بازه طول موجی 3 تا 5 میکرومتر، ادوات مهمی برای کاربردهای تصویربرداری پزشکی، دید در شب، تجهیزات آتش نشانی و کاربردهای دفاعی و امنیتی به حساب می آیند. نوع جدیدی از سنسورهای مادون قرمز، آشکارسازهای نوری بهمنی نقطه کوانتومی می باشند. یکی از پارامترهای اساسی در مدلسازی فیزیکی آشکارسازها، جریان نوری است. این کمیت مرتبط با میزان جذب در ناحیه جاذب و ضرب در ناحیه ضرب بهمنی می باشد...
Carrier multiplication, the generation of multiple electron-hole pairs by a single photon, is of great interest for solar cells as it may enhance their photocurrent. This process has been shown to occur efficiently in colloidal quantum dots, however, harvesting of the generated multiple charges has proved difficult. Here we show that by tuning the charge-carrier mobility in quantum-dot films, c...
An engineered strain of Stenotrophomonas maltophilia (SMCD1) is capable of the direct extracellular biomineralization of CdS quantum dot nanocrystals from buff ered aqueous solution of cadmium acetate and L-cysteine without the addition of a chemically reactive precursor. Nanocrystal synthesis is strongly influenced by both the Lcysteine/cadmium acetate ratio and pH of the solution. The observe...
In this paper, we investigate variation of the wavelength, intensity and polarization of the self-assembled InAs/GaAs quantum dots emission by microphotoluminescence spectroscopy at the liquid helium temperature. The microcavity wafer sample is grown by molecular beam epitaxy (MBE) and chemically etched into the micropillar structure (with elliptical cross section - long and short axis 2µm×1.5µ...
The reported photocurrent density (J(SC)) of PbS quantum dot (QD)-sensitized solar cell was less than 19 mA/cm(2) despite the capability to generate 38 mA/cm(2), which results from inefficient electron injection and fast charge recombination. Here, we report on a PbS:Hg QD-sensitized solar cell with an unprecedentedly high J(SC) of 30 mA/cm(2). By Hg(2+) doping into PbS, J(SC) is almost doubled...
A solution-based passivation scheme is developed featuring the use of molecular iodine and PbS colloidal quantum dots (CQDs). The improved passivation translates into a longer carrier diffusion length in the solid film. This allows thicker solar-cell devices to be built while preserving efficient charge collection, leading to a certified power conversion efficiency of 9.9%, which is a new recor...
In this paper, the nonlinear rate equations governing a quantum dot laser isused to simulate the transient as well as the steady-state behaviors of the laser.Computation results show that the rate equations are capable of simulating true behaviorof a quantum dot laser. Then, the pump rates of the rate equations (which show indirectelectrical pumping of the quantum dots through a wetting layer) ...
A fundamental limitation in achieving ultra-high efficiency solar cells (> 50%) is the availability of materials and corresponding device structures. The InGaN material system offer substantial potential in developing ultra-high efficiency devices, both because of measurements indicating that the band gap on InN is lower than previously though and also due to other unique material properties, s...
Nickel nitride electrodes were prepared by reactive sputtering of nickel under a N2 atmosphere at room temperature for application in mesoscopic dye- or quantum dot- sensitized solar cells. This facile and reliable method led to the formation of a Ni2N film with a cauliflower-like nanostructure and tetrahedral crystal lattice. The prepared nickel nitride electrodes exhibited an excellent chemic...
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