Until now, spatially resolved Raman Spectroscopy has required to scan a sample under investigation in time-consuming step-by-step procedure. Here, we present technique that allows the capture of an entire image with only one single exposure. The scattering arising from was collected fiber-coupled high-performance astronomy spectrograph. probe head consisting array 20 × multimode fibers linked camera port microscope. To demonstrate high potential this new concept, images reference samples...

The era of the seed-cast grown monocrystalline-based silicon ingots is coming. Mono-like, pseudomono or quasimono wafers are product labels that can be nowadays found in market, as a critical innovation for photovoltaic industry. They integrate some most favorable features conventional substrates solar cells, so far, such high cell efficiency offered by monocrystalline Czochralski-Si (Cz-Si) and lower cost, productivity full square-shape characterize well-known multicrystalline casting...

Imaging Raman spectroscopy can be used to identify cancerous tissue. Traditionally, a step-by-step scanning of the sample is applied generate image, which, however, too slow for routine examination patients. By transferring technique integral field (IFS) from astronomy imaging, it becomes possible record entire images quickly within single exposure, without need tedious procedure. An IFS-based imaging setup presented, which capable measuring skin ex vivo or in vivo. It demonstrated how...

Abstract. Step-by-step, time-consuming scanning of the sample is still state-of-the-art in imaging Raman spectroscopy. Even for a few 100 image points measurement time may add up to minutes or hours. A radical decrease can be achieved by applying multiplex spectrographs coupled fiber bundles that are successfully used astronomy. For optimal use scarce and expensive observation at astronomical observatories, special high-performance spectrograph systems were developed. They designed recording...

The growth process by casting methods of multi-crystalline Si results in a crystalline material with, among other defects, high density dislocations and grain boundaries.Impurity incorporation their gathering around boundaries seem to be the main factor determining electrical activity those which limit minority carrier lifetime.In this work, we analyze samples combining etching processes reveal Raman spectroscopy for strain measurements, light beam induced current measurements localization...

After having demonstrated that an IFU, attached to a microscope rather than telescope, is capable of differentiating complex organic tissue with spatially resolved Raman spectroscopy, we have launched clinical validation program utilizes novel optimized fiber-coupled multi-channel spectrograph whose layout based on the modular MUSE concept. The new design features telecentric input and has extended blue performance, but otherwise maintains properties high throughput excellent image quality...

Abstract In this work we present LBIC measurements of a set commercial multicrystalline silicon samples manufac‐tured by different suppliers. The were obtained with home‐made system, using several excitation wavelengths, equipped an autofocus and controlling the reflected light. This system keeps constant distance between microscope objective sample, despite bowing surface roughness characteristic type samples. For calculation L eff maps one needs to consider distribution light, which...

Abstract Mono‐cast Si growth is currently a very promising approach to optimize the cost per watt in production of PV devices, simultaneously increasing installed energy/m 2 ratio. However, due novelty this approach, material properties have not yet been studied detail. In work, by combining PL imaging with electrical characterization techniques (LBIC and EBIC), both large scale local wafers grown from mono‐cast ingots analyzed. shows two kinds defects, which were detail LBIC. Electrical...

In astronomical spectroscopy, optical fibers are abundantly used for multiplexing and decoupling the spectrograph from telescope to provide stability in a controlled environment. However, less than perfect components introduce complex effects that diminish overall throughput, efficiency, of instrument. We present novel numerical field propagation model emulates modal noise, scrambling, focal ratio degradation with rigorous treatment wave optics. demonstrate simulation near- far-field output...

Abstract Astrophysicists use Integral Field Spectroscopy to record spectrally resolved images of faint galaxies. Transferred imaging Raman spectroscopy, this technique significantly accelerates the capture as simultaneous acquisition multiple spectra makes scanning procedures obsolete. Furthermore, sequentially collected result in image sequences thus allowing monitor features spatial dimension over time. However, long readout times required large‐area charge coupled device detectors slow...

We here report on recent progress astronomical optical frequency comb generation at innoFSPEC-Potsdam and present preliminary test results using the fiber-fed Multi Unit Spectroscopic Explorer (MUSE) spectrograph. The is generated by propagating two free-running lasers 1554.3 1558.9 nm through dispersionoptimized nonlinear fibers. centered 1590 comprises more than one hundred lines with an optical-signal-to-noise ratio larger 30 dB. A crystal used to double whole spectrum, which efficiently...

Photovoltaic (PV) industry is facing one of its worst times ever. The over-capacity and the reduced market worldwide are impacting supply/demand across PV value chain, leading to certainly low sell prices, noticeably below production costs. As a consequence, many factories going into insolvency in these times. In addition, insufficient options install modules demand devices based on well-optimized cost/performance (CP) ratios. Crystalline growth silicon solar wafers for has direct influence...

Photoluminescence imaging technique has recently emerged as a powerful tool for obtaining very quick sorting of silicon based solar wafers and cells. In this work, we report on low-cost photoluminescence system, paying special attention to the different constituting elements. Results both commercial multicrystalline (mc) seed-monocast (sm) Si cells are discussed.

Defects on mono-like and polycrystalline silicon solar cells are studied in depth. These defects the basis of higher quantum efficiency (~18%) with respect to ones (~16 <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">%</sub> ). Using thermal admittance spectroscopy technique we found that both them have a deep level due Fe-B complex. Furthermore, first one (224meV) is shallower than second (345meV). Shallower levels degrade less cells, so this...

Multi-crystalline Si is the preferred material in photovoltaic world market due to good balance between production costs and efficiency. However, it has a large number of defects acting as recombination centers for photogenerated carriers. In this work, we use both fast inspection provided by photoluminescence imaging technique with very high spatial resolution light beam induced current electron techniques, obtaining comprehensive understanding electrical activity distribution material.

In this paper we combine LBIC and EL measurements of commercially multi-crystalline silicon solar cells, in order to obtain detailed information about the electrical activity around defect areas. This integrated analysis is suitable for study different crystal defects at both micrometric full wafer scale. particular, some areas studied detail by means highly spatially-resolved maps, showing important differences their behaviours. A discussion origin these presented.

The purpose of this work is to present recent LBIC studies by using an improved system that highlights the importance controlling experimental conditions measurements (laser power excitation and reflected light) when studying effective minority-carrier diffusion length (Leff) multicrystalline Silicon (mc-Si) solar cells. Special attention has been paid study defects responsible for capture photogenerated carriers; e.g., grain boundaries intragrain defects. Industrial cells based on...