Sputtering of Molybdenum as a Promising Back Electrode Candidate for Superstrate Structured Sb S Solar Cells.

Sb S is rapidly developed as light absorber material for solar cells due to its excellent photoelectric properties. However, the use of the organic hole transport layer of Spiro-OMeTAD and gold (Au) in Sb S solar cells imposes serious problems in stability and cost. In this work, low-cost molybdenum (Mo) prepared by magnetron sputtering is demonstrated to serve as a back electrode in superstrate structured Sb S solar cells for the first time.

Self-assembled CsPbBr quantum dots with wavelength-tunable photoluminescence for efficient active jamming.

CsPbBr perovskite quantum dots (QDs) show great potential in various applications due to their size-dependent and excellent optoelectronic properties. However, it is still challenging to synthesize size-tunable CsPbBr QDs with purple emission. Herein, CsPbBr nanospheres (NS) with purple emission (432 nm) and wavelength-tunable photoluminescence were synthesized using a two-step recrystallization method for the first time.

Reduction of speckle noise in digital holography using a neighborhood filter based on multiple sub-reconstructed images.

The application of digital holography in several fields is limited since speckle destroys the original information of the reconstructed image. This paper proposes a neighborhood filter based on multiple sub-reconstructed images according to the random distribution of speckle noise. In this method, the denoised value is equal to the weighted sum of neighboring pixel values, and the weight is calculated by the degree of correlation between different positions of multiple sub-holograms.

Speckle reduction in digital holography with non-local means filter based on the Pearson correlation coefficient and Butterworth filter.

This Letter presents a non-local means filter based on the Pearson correlation coefficient and Butterworth high-pass filter. In the method, the new gray value of the denoising pixel is equal to the weighted sum of the surrounding pixel values. We use the Pearson correlation coefficient between the pixels to calculate the weight of the surrounding pixels to the denoising pixel, then use Butterworth high-pass filter to optimize.

[Measurement and analysis on complex refraction indices of pear pollen in infrared band].

Pollen is an important part of bioaerosols, and its complex refractive index is a crucial parameter for study on optical characteristics and detection, identification of bioaerosols. The reflection spectra of pear pollen within the 2. 5 - 15µm waveband were measured by squash method.

[Classification of hyperspectral imagery based on ant colony compositely optimizing SVM in spatial and spectral features].

A novel classification algorithm of hyperspectral imagery based on ant colony compositely optimizing support vector machine in spatial and spectral features was proposed. Two types of virtual ants searched for the bands combination with the maximum class separation distance and heterogeneous samples in spatial and spectral features alternately. The optimal characteristic bands were extracted, and bands redundancy of hyperspectral imagery decreased.

[Luminescence properties of Eu3+/Dy3+ coating ZnO nanocrystals].

Some kinds of phosphors were synthesized with Eu/Dy coating ZnO nanocrystals by co-precipitation approach derived from Zn(AC)2 2H2O, NaOH as precursors. The crystal structure and size were characterized by the X-ray diffraction Photoluminescence(PL) measurements show an intense red luminescence at 612 nm caused by transition of Eu3+ ions in ZnO:Eu3+ and intense luminescence band at 484 and 575 nm caused by transition of Dy3+ ions in ZnO:Dy3+. The results show that the energy transfer was realized from the host to the rare earth ions.

[Characteristic vibration analysis of M-RNA nucleic acid bases complexes (M = Ca+ and Mg+) by DFT].

A density functional investigation of the interaction between calcium and magnesium univalent cations and RNA pyrimidine base (cytosine, thymine and uracil) was performed to determine geometric coordinates and free energies for all possible stable isomers at B3LYP/6-311 + G (2df, 2p) level. The most stable isomers C1M, T1M and U1M (M = Ca+ and Mg+) with the lowest free energy among the same pyrimidine base tautomers were calculated to determine the characters of infrared vibrations. According to the results, two characteristic infrared vibrations at wave numbers 1,684 and 1,765 cm(-1) were found for single pyrimidine base C1, at 1,747 and 1,792 cm(-1) for T1, 1,763 and at 1,796 cm(-1) for U1.