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The dielectric constant is the ratio of the electric permeability of the material to its free space. The key is a balance between two properties of the solvent itself: its dielectric constant and Gutmann donor number. Cells created in the Rice lab exposed to strong light for 2,000 hours degraded their efficiency by less than 1%. Rice graduate student Siraj Sidhik sets up an experiment to expose a bilayer perovskite cell to artificial sunlight. Rice University graduate student Siraj Sidhik sets up an experiment to expose a bilayer perovskite cell to artificial sunlight. When the liquid evaporates, the pure coating remains. Solution processing is widely used in industry and incorporates a range of techniques - spin coating, dip coating, blade coating, slot die coating and others - to deposit material on a surface in a liquid. Not counting a glass substrate, the cells were about 1 micron thick. The efficiency of test cells exposed to the lab equivalent of 100% sunlight for more than 2,000 hours “does not degrade by even 1%,” he said. “It allows us to control the flow of charge and energy for not only solar cells but also optoelectronic devices and LEDs.”

“This leads to very high efficiencies because now, for the first time in the field, we are able to create layers with tremendous control,” he said. Combining them incorporates the best features of both. 3D perovskites are more efficient but less stable. Mohite said 2D perovskite cells are stable, but less efficient at converting sunlight. “When you put a 2D layer on top of a 3D layer, the solvent destroys the underlying layer,” he said. The problem is they both dissolve in the same solvents. “One is that it’s fundamentally challenging to make a solution-processed bilayer when both layers are the same material. “This is significant at multiple levels,” Mohite said. The new advance, he said, largely removes the last major roadblock to commercial production. Mohite and many others have worked for years to make perovskite solar cells practical. Perovskites are crystals with cubelike lattices known to be efficient light harvesters, but the materials tend to be stressed by light, humidity and heat. “The 2D perovskites absorb blue and visible photons, and the 3D side absorbs near-infrared.”

“This is really good for flexible, bifacial cells where light comes in from both sides and also for back-contacted cells,” he said. That’s as efficient as most commercially available solar cells, Mohite said. Brown School of Engineering reported in Science their success at building thin 3D/2D solar cells that deliver a power conversion efficiency of 24.5%. Such a cell would turn more sunlight into electricity than either layer on its own, with better stability.Ĭhemical and biomolecular engineer Aditya Mohite and his lab at Rice’s George R.

It took finding the right solvent design to apply a 2D top layer of desired composition and thickness without destroying the 3D bottom one (or vice versa). Technology - Technology (General) - Technical education.Rice University engineers say they’ve solved a long-standing conundrum in making stable, efficient solar panels out of halide perovskites. Sanitary engineering - Environmental technology. Nuclear engineering - Production of electric energy or power - Production from solar energy - Photovoltaic power generation. Nuclear engineering - Electrical engineering. Photoelectronic devices - Semiconductor devices - Photovoltaic cells Nuclear engineering - Electronics - Optoelectronic devices.

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Users must download this resource for viewing, which requires a free log-in. The Advanced Technology Environmental and Energy Center (ATEEC) provides this document which will help instructors or anyone who would like to understand the basics of solar power and solar cells. Advanced Technology Environmental and Energy Center

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