Mostrando ítems 1-10 de 162
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Surface Recombination and Collection Efficiency in Perovskite Solar Cells from Impedance Analysis
(American Chemical Society, 2016-11)
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. ...
Investigating the Consistency of Models for Water Splitting Systems by Light and Voltage Modulated Techniques
(American Chemical Society, 2016-12)
The optimization of solar energy conversion devices relies on their accurate and nondestructive characterization. The small voltage perturbation techniques of impedance spectroscopy (IS) have proven to be very powerful to ...
Toward High-Temperature Stability of PTB7-Based Bulk Heterojunction Solar Cells: Impact of Fullerene Size and Solvent Additive
The use of fullerene as acceptor limits the thermal stability of organic solar cells at high temperatures as their diffusion inside the donor leads to phase separation via Ostwald ripening. Here it is reported that ...
Room temperature stable ClPrNTf2 ionic liquid utilizing for chemical sensor development
A stable ionic liquid was prepared at room-temperature using the metathesis reaction, which was consummated by the reaction of l-Phenylalanine ethyl ester hydrochloride (chlorpromazine hydrochloride) with lithium-bis(tri ...
Excitons diffusion and singlet-triplet occupation at high Bose-Einstein chemical potential
The paper investigates the bosonic aspects of exciton statistics in non-equilibrium situations. A kinetic model is formulated treating the excitons in different states as chemical species, using a master equation consistent ...
Shelf Life Degradation of Bulk Heterojunction Solar Cells: Intrinsic Evolution of Charge Transfer Complex
Achievement of long-term stability of organic photovoltaics is currently one of the major topics for this technology to reach maturity. Most of the techniques used to reveal degradation pathways are destructive and/or do ...
Recombination rates in heterojunction silicon solar cells analyzed by impedance spectroscopy at forward bias and under illumination
Impedance spectroscopy (at forward bias and under illumination) of solar cells comprised thin hydrogenated amorphous silicon (a-Si:H) films deposited on crystalline silicon (c-Si) wafers was analyzed in terms of ac equivalent ...
Charge carrier mobility and lifetime of organic bulk heterojunctions analyzed by impedance spectroscopy
Charge carrier diffusion and recombination in an absorber blend of poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl C<sub>61</sub>-butyric acid methyl ester (PCBM) with indium tin oxide (ITO) and aluminium contacts have been ...
Band unpinning and photovoltaic model for P3HT:PCBM organic bulk heterojunctions under illumination
Capacitance analysis of P3HT:PCBM bulk heterojunction solar cells, in dark and under illumination, shows a linear Mott-Schottky characteristic at moderate reverse bias, indicating p-doping of the organic blend. The flatband ...
Distinction between capacitive and noncapacitive hysteretic currents in operation and degradation of perovskite solar cells
(American Chemical Society, 2016)
Perovskite solar cells suffer from significant performance distortions under working conditions, usually known by the generic label of hysteretic effects. A classification of the fluctuations associated with current–voltage ...