Defect Complexes in Semiconductor Structures

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Since , a small and somewhat exotic class of perovskites, which are quite different from the common rock-solid oxide perovskite, have turned over a new leaf in solar cell research. Highlighted as one of the major scientific breakthroughs of the year , the power conversion efficiency of the title compd. In this mini-review, a brief history of perovskite materials for photovoltaic applications is reported, the current state-of-the-art is distd.

Hybrid halide perovskites represent one of the most promising solns. Independent of the components ratio in the precursor soln. However, even if the material band gap remains substantially unchanged, the Cl doping dramatically improves the charge transport within the perovskite layer, explaining the outstanding performances of meso-superstructured solar cells based on this material. A , 3 , — DOI: Eperon, Giles E. The vast majority of perovskite solar cell research has focused on org.

Herein, we present working inorg. CsPbI3 perovskite solar cells for the first time. CsPbI3 normally resides in a yellow non-perovskite phase at room temp. As such, we have fabricated solar cell devices in a variety of architectures, with current-voltage curve measured efficiency up to 2.

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The well-functioning planar junction devices demonstrate long-range electron and hole transport in this material. Importantly, this work identifies that the org. We addnl. Due to its space group, CsPbI3 cannot be a ferroelec. Our report of working inorg. Nature , , — DOI: Nature Publishing Group. Dye-sensitized solar cells based on TiO2 are promising low-cost alternatives to conventional solid-state photovoltaic devices based on materials such as Si, CdTe and CuIn1-xGaxSe2.

Despite offering relatively high conversion efficiencies for solar energy, typical dye-sensitized solar cells suffer from durability problems that result from their use of org.

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Replacements for iodine-based liq. Here we show that the soln. The resulting solid-state dye-sensitized solar cells consist of CsSnI2. With a bandgap of 1. Lee, Michael M.

The energy costs assocd. A low-cost, soln.

This "meso-superstructured solar cell" exhibits exceptionally few fundamental energy losses; it can generate open-circuit photovoltages of more than 1. The functionality arises from the use of mesoporous alumina as an inert scaffold that structures the absorber and forces electrons to reside in and be transported through the perovskite. Many different photovoltaic technologies are being developed for large-scale solar energy conversion.

The wafer-based 1st-generation photovoltaic devices have been followed by thin-film solid semiconductor absorber layers sandwiched between 2 charge-selective contacts and nanostructured or mesostructured solar cells that rely on a distributed heterojunction to generate charge and to transport pos. Although many materials have been used in nanostructured devices, the goal of attaining high-efficiency thin-film solar cells in such a way has yet to be achieved.

Organometal halide perovskites have recently emerged as a promising material for high-efficiency nanostructured devices. Nanostructuring is not necessary to achieve high efficiencies with this material: a simple planar heterojunction solar cell incorporating vapor-deposited perovskite as the absorbing layer can have solar-to-elec. Perovskite absorbers can function at the highest efficiencies in simplified device architectures, without the need for complex nanostructures.

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Following pioneering work, soln. So far, the perovskite pigment has been deposited in a single step onto mesoporous metal oxide films using a mixt. However, the uncontrolled pptn. Here we describe a sequential deposition method for the formation of the perovskite pigment within the porous metal oxide film. PbI2 is first introduced from soln. We find that the conversion occurs within the nanoporous host as soon as the two components come into contact, permitting much better control over the perovskite morphol.

Using this technique for the fabrication of solid-state mesoscopic solar cells greatly increases the reproducibility of their performance and allows us to achieve a power conversion efficiency of approx. This two-step method should provide new opportunities for the fabrication of soln. Choi, Joshua J. The authors report the structure of methylammonium Pb- II iodide perovskite in mesoporous TiO2, as used in high-performance solar cells.

Pair distribution function anal. The nanostructuring correlates with a blueshift of the absorption onset and increases the photoluminescence. The findings underscore the importance of fully characterizing and controlling the structure for improved solar cell efficiency. The author attempt to quantify the total lead content of halide perovskite photovoltaic devices that would be required to supply current electricity needs in the United States as an indicator of the upper bound on possible lead pollution during the service life of this technol.

This figure is compared with select historical and current sources of lead pollution in the U.

The recent advent of metal halide perovskite solar cells revolutionized prospects for next-generation photovoltaics. As this technol. A broad org. The compds. The chem. Single crystal x-ray diffraction anal. Structural phase transitions were obsd. The charge transport properties of the materials are discussed in conjunction with diffuse reflectance studies in the mid-IR region that display characteristic absorption features.

Optical absorption measurements indicate that behave as direct-gap semiconductors with energy band gaps distributed at 1. Solid solns.

Point defects in group IV semiconductors - Materials Research Forum

The optical properties such as energy band gap, emission intensity, and wavelength can be readily controlled for the isostructural series of solid solns. The charge transport type in these materials was characterized by Seebeck coeff. The samples with the lowest carrier concn. In the case of Sn compds. The authors also compare the properties of the title hybrid materials with those of the all-inorg. Frost, Jarvist M.

The performance of organometallic perovskite solar cells has rapidly surpassed that of both conventional dye-sensitized and org. High-power conversion efficiency can be realized in both mesoporous and thin-film device architectures. The authors address the origin of this success in the context of the materials chem. In addn. As the authors show, hybrid perovskites exhibit spontaneous elec. The presence of ferroelec. The combination of high dielec. The photoferroic effect could be exploited in nanostructured films to generate a higher open circuit voltage and may contribute to the current-voltage hysteresis obsd.

Bass, Kelsey K. The effect of prepg.

When a defect might be beneficial

Pb-based organohalide perovskites under inert conditions was studied. When prepd. On exposure to small amts. While the as-prepd. We report on the effect of humidity on the structural, optical, and elec. The relative humidity strongly affects the perovskite film morphol.

Lecture 19: Compound Semiconductor Materials Science (Semiconductor Defects)

This morphol. The device based on a planar FAPbI3 film shows the best conversion efficiency of Higher humidity leads to lower device performance, mainly due to the loss of open-circuit voltage and fill factor, which is consistent with the decrease in recombination resistance.