Management of light is a crucial task in solar cell design and structure because it increases the path length inside, which turn probability electron-hole pair generation. This study addresses impact pyramidal textured on spectral transmission morphology silicon. The silicon wafers was investigated using PC3S software to transmission, reflectance, collection probability, mobility, carriers, ele...

Back-contact perovskite solar cells offer a significant potential to reach high efficiency due reduced parasitic absorption from the top surface. However, currently reported efficiencies are considerably lower (<10%) than planar (>20%). Herein, back-contact fabricated study loss mechanisms that cause low device efficiency. This work spatially resolves short-circuit current, open-circuit voltage...

In Gratzel’s cell, the electrons injected by the photo-excitation of dye molecules, anchored to a mesoporous TiO2 film, efficiently diffuse to the back contact achieving solar energy conversion at efficiencies exceeding 10%. The mesoporous TiO2 surface constituted of randomly arranged nanocrystallites with a roughness factor of the order 1000 is heavily populated with traps, defects and adsorbe...

We report on electrical transport in the dark and under ultraviolet (UV) illumination through GaN nanowhiskers grown by molecular beam epitaxy (MBE), which is sensitively dependent on the column diameter. This new effect is quantitatively described by a size dependent surface recombination mechanism. The essential ingredient for the interpretation of this effect is a diameter dependent recombin...

The genome of Pneumocystis, which causes life-threatening pneumonia in immunosuppressed patients, contains a multicopy gene family that encodes the major surface glycoprotein (Msg). Pneumocystis can vary the expressed Msg, presumably as a mechanism to avoid host immune responses. Analysis of 24 msg-gene sequences obtained from a single human isolate of Pneumocystis demonstrated that the sequenc...

The large diffusion lengths recurrently measured in perovskite single crystals and films signal small bulk nonradiative recombination flux and locate the dominant carrier recombination processes at the outer interfaces. Surface recombination largely determines the photovoltaic performance, governing reductions under short-circuit current and open-circuit voltage. Quantification of recombination...