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Study of the emission behavior of organometal halide perovskites CH3NH3PbBr3 as function of excitation intensity by using photoluminescence (PL) and time-resolved photoluminescence (TRPL) techniques reveals the photo-activated mobile ion can evidently impact carrier dynamics in the minutes time scale. We observe that PL intensity and PL decay exhibit excitation intensity dependent reductions in the...
A 10nm ZnS thin film was employed between Si substrate and Cu2ZnSnS4 (CZTS) layer prepared by sulfurizing the sputtered metallic stacking layers. The properties of as-prepared CZTS films with and without a ZnS intermediate layer were compared to investigate the effect of ZnS layer. The introduction of this ZnS layer dramatically reduced the void density between CZTS and Si substrate, and enhanced...
Hot carrier solar cell (HCSC) is a promising third generation photovoltaic device which can potentially able to overcome the Shockley-Queisser limit and achieve much higher power efficiency than present single junction solar cells. The theoretical efficiency for an ideal HCSC is predicted to be 65% under 1 sun solar radiation or 85% under maximal concentration. A critical requirement of the absorber...
The hot carrier (HC) solar cell aims to minimize the major losses in single junction solar cells due to the non-absorbance of the sub-bandgap photons and thermalisation of above bandgap photons (‘hot carriers’) and hence can achieve very high efficiencies. One of the crucial requirements for this is to have an absorber which can sufficiently reduce the rate of hot carrier cooling so that they can...
Hot carrier solar cells aims to circumvent fundamental loss mechanisms by extracting carriers before thermalization of hot carriers occurs while also minimizing sub-bandgap losses. The absorber must be able to maintain a hot carrier for a sufficiently long time. Hafnium nitride owing to its phononic properties to slow carrier thermalization is a potential absorber for the hot carrier solar cell. The...
The Hot Carrier (HC) solar cell aims to tackle a major loss in conventional solar cells by collecting the hot carriers before they thermalise. The calculated efficiency of the HC solar cell is very close to the limiting efficiency for an infinite tandem cell. The HC solar cell requires an absorber with a low electronic band gap so that it can absorb a large fraction of the solar spectrum. Importantly...
Limited domain multiplication is the most basic computing in the elliptic curve cryptosystem(ECC), so it is very important to design fast time-multiplier to improve the speed of encryption and decryption. In this paper, Multiplication matrix was given on the analysis of the multiplication tables of optimal normal basis(ONB) in the finite fields, which can be used by type I and type II. The matrix...
Using the Mallat fast algorithm with sym5 wavelet, the pulse waves of 20 heroin druggers and 20 healthy normal subjects are decomposed into two levels. The squared distances from the third and tenth scale coefficients in the second-level decomposition of every pulse wave to the global mean value are used to form a feature vector. The extracted feature vectors have good separable characteristics in...
We have performed one and two colour, spectrally resolved four-wave mixing (FWM) experiments on a series of ZnO/Zn1-xMgxO quantum wells with different oxygen ion implantation doses. The results show that at room temperature and with resonant excitation, excitonic coherences are maintained beyond the duration of the laser pulse. A transient signal observed at negative delays in the two-colour experiments...
In this paper we report studies of the optical properties of silicon quantum dot structures. From time-resolved and time-integrated photoluminescence measurements we investigate the state-filling effect and carrier lifetime and discuss the parabolic confinement of quantum dot structures. The photoluminescence intensities for different quantum dot levels decay with a stretched exponential function...
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