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Retrofit light solar cells are also powered

Return Listsource:Gratene date: 2022-06-17

Retrofit light solar cells are also poweredLet us imagine the following scenarios: Never use the phone, Kindle or tablet charging, is it very surprised? Recently, some researchers said they have discovered a low-intensity diffuse light that can utilize the internal and cloudy world of the building, and the work efficiency reaches a certain value. Such solar cells may continue to charge the device in the future, the outer casing of the equipment can be continuously charged, so that there is no need to insert the socket to charge.

The diffuse light solar cell is not new, basically relying on expensive semiconductor materials to achieve the best results. In 1991, the Chemist of the Swiss Lausanian Federal Institute of Technology, invented the so-called dye-sensitized solar cell (DSSCS), which could achieve the best working effect under dim light, and more than the standard solar cell. Cheap. Under the sun, the best DSSCS can only convert 14% solar energy into electrical energy, while the standard solar cell conversion efficiency is 24%. The main reason behind it is that light energy is too fast, and DSSCs cannot be converted in time. Therefore, when the light can take a slow step to it, such as low-intensity indoor light, the conversion efficiency of DSSCs can be increased to 28%.

DSSCS is a bit different from the standard silicon solar cell: a standard silicon solar cell, absorbed sunlight excises electrons on the silicon atom to a higher level, so that they can skip the adjacent atoms to move toward the positive electrode. Electron is collected and shifted into the circuit, allowing the circuit to operate. The exented electrons have left holes in silicon atoms, and holes are also movable, and over time, holes will flow to negative electrodes, and the electron with electrons in the negative electrode and the electrical battery of the solar cell. Balance to make it sustainable.

DSSCS increases the complication of power generation to another. Its two ends still have electrodes that collect positive and negative charges, but in the middle, no longer simply silicon, but other materials, typical materials are titanium dioxide (TiO2) particles. Titanium dioxide is not good light absorbing material, and the researchers try to coat special light absorbing materials on the surface of the particles.——Organic dye molecule. The absorbed photons excite the electrons and holes of these dye molecules, excited electrons immediately transferred to titanium dioxide particles, and moved to the positive electrode via titanium dioxide particles. At the same time, these holes are transferred to the electrolyte (conductive liquid) and finally reach the negative electrode.

The problem in DSSCS is that the air point is slow in the electrolyte, causing holes to accumulate near the dye and titanium dioxide particles, once excited by the electronic hole, the two meet, the generated is thermal energy rather than electricity.

In order to solve this problem, the researchers have tried the use of thin electrolyte, which is convenient for the air to reach the destination with the nearest distance. However, any of the defects of the thin layer of the electrolyte may cause a device to short the device, and you can make the entire solar battery crash at any time. Now, Gratzel and his colleagues came up another possible solution, and they designed a combination of dyes and hole conductors, and wrapped around the titanium dioxide particles, thereby forming without any defects, close fitting The layer, which solves the slow hole that the mobile speed is slow to take a long way to go to the negative pole. On the 23rd, on the 23rd, they published a report that this tight layer increased the conversion efficiency of DSSCS to diffuse light to 32%.——Close to the highest theoretical value.

MichaelwasieLewski, Northwestern University Chemist said:“This is really a very good progress.”Although this new dye-sensitized battery is only 13.1% for the conversion efficiency of sunlight direct, he pointed out that due to the increase of nearly 20% of the conversion efficiency of diffused light, it will find a new method to find a new method. Improve the hope of conversion efficiency in full sun. 

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