Method of increasing photoelectricity conversion efficiency of TiO2 photocell

Abstract

The invented method carries processing for nano TiO2 in radiofrequency plasma generating device by using gas to raise photoelectric conversion efficiency of TiO2 photocell. The method is as following: placing nano TiO2 in radiofrequency plasma generating device, after vacuumizing, at least one of following gas Ar, He, N2, N2+H2 is added to radiofrequency plasma generating device; adjusting following parameters: gas flow rate 0.01-0.90 liter / minute, power of radio frequency 50-1000W, temperature 100-550deg.C and processing time 0.5-10 hour. The product is obtained after processing. The processed product possesses better performance of photovoltaic conversion, and conversion efficiency is raised to 30%-80%.

Description

technical field [0001] The present invention relates to a kind of gas (such as Ar, He, N 2 , N 2 +H 2 ) RF plasma on TiO 2 Methods for processing nanocrystals, especially TiO for photoelectric conversion 2 Nanocrystalline. Background technique [0002] TiO 2 As a wide bandgap semiconductor material, it has strong application value in photoelectric conversion, photocatalysis and pollution treatment, and is one of the most active research hotspots in the fields of materials science, chemistry and environmental science. [0003] In terms of photoelectric conversion, TiO 2 Nanocrystalline photovoltaic cells have the incomparable advantages of long service life, no pollution, rich and low-cost raw materials, simple manufacturing process, and conducive to large-scale production. But TiO 2 Nanocrystalline photovoltaic cells have two defects: one is due to TiO 2 It is a semiconductor material with a wide bandgap, its bandgap width is 3.2ev, and it can only use sunlight with...

AI Technical Summary

Problems solved by technology

But TiO 2 Nanocrystalline photovoltaic cells have two defects: one is due to TiO 2 It is a semiconductor material with a wide bandgap, its bandgap width is 3.2ev, and it can only use sunlight with a wavelength below 400nm, which accounts for only 3% to 5% of the sunlight intensity; the second is that electron- —The recombination of hole pairs restricts the further improvement of its photoelectric conversion efficiency

Commonly used modification methods include TiO 2 Nanocrystals are doped with noble metals, composite films, etc., but the effects are not very significant