Graphite surfaces are expected to do that application examples are one of the conversion efficiency is very high new generation of solar cells. Forecast its future application field, first is transparent conductive film field, followed by the intermediate electrode etc.
Not only is to replace ITO
For graphite surfaces system transparent conductive film, touching panel faction expectation is higher, but solar battery manufacturer expectations may have higher. This is because graphite surfaces not only in replacing ITO properties or higher, and only its flexible graphite surfaces transparent conductive film can be achieved for solar battery is very important characteristics.
This feature is to include cosco infrared, in all infrared high transparency. Though infrared occupy a part of the solar radiation energy, but the existing majority of solar cells can take as an energy source for infrared effective utilization. This is because in addition to effective photoelectric conversion itself is not easy outside, so far more for realizing transparent electrode for infrared ITO and FTO transmission rate actually are low.
If just for infrared ensure transparency is enough words, material of development is not difficult. However, this material is mostly in the principle will face conductivity greatly reduced problems.
The reasons are as follows: under normal conditions to ensure widespread wavelength in the field of transparency, carriers density as low as possible. However, due to the conductivity and charge density of mobility and the carrier in proportion, so if the product is not very high, mobility carriers so lesser charge density means conductivity small. Its typical example is a glass the insulators. No matter how transparent, as long as the electric current cannot go through, it doesn't make any sense.
Graphite surfaces is nearly the only one to avoid this kind of the material in question. The reason is that graphite surfaces are of very high mobility carriers. Therefore, even if charge density is very small, also can ensure certain conductivity. This material is very rare.
Super efficient solar battery realization near at hand
Recently some research institute is to carry out actively photoelectric conversion coating materials development, some infrared efficient conversion technology also successively appeared. This way, if can use of infrared transparency also high transparent conductive film, then can look forward to achieve than existing solar cells conversion efficiency.
At present, in these development activities of the leading manufacturer is one of Fuji holding LTD. The company is currently new energy industry technology comprehensive development institutions (NEDO) "innovative solar power generation technology research and development program, and actively developing using graphite surfaces of solar cells with transparent conductive film.
However, Fuji in fact have dropped so far has been developed using oxidation graphite surfaces making graphite surfaces piece of technology. As alternative methods newly introduced samsung etc also USES hot CVD method. Through a series of independent improvement get layer 2 graphite surfaces film's "conductivity could be as much as ITO several times, and can ensure that 90% of the light transmission rate has reached can fully meet performance index level" (Fuji).
The issue is to be solved mass-production sexual problems. "We hope again can reduce CVD law process temperature. Also need to establish the method which used in the copper recycle process. In addition, still need to confirm and solar cell semiconductor layers of compatibility and so on" (Fuji).
As electronic and cavities both transmission materials
Graphite surfaces in solar battery USES are expected to do that is not associated with the sun transparent electrode. Insert semiconductor between layers of intermediate electrode applications are also discussing among.
Graphite surfaces can bring out the best power field is organic film solar battery domain. First single separation of graphite surfaces in Manchester, England, researchers at the university NuoWo Konstantin XiaoLuoFu (Novoselov Konstantin) would accept the nikkei said in an interview electronic "book" organic film solar cells is closest to the practical application of graphite surfaces one ".
In solar use graphite surfaces as intermediate electrode advantage is transparent and with semiconductor layer compatibility is higher. Especially the intermediate electrode material requirements hold concurrently at the two properties. Specifically, "and (to date as the intermediate electrode) generally TiO2 / PDOT compared, graphite surfaces electrode and semiconductor layer compatibility better" (Japan 埼 jade university ueno rev department professor).
In this respect, graphite surfaces of the carriers of electronic and cavities mobility equal this nature also makes certain contribution. Previously, the intermediate electrode generally use n-type overlapped and p type two kinds of material. Because of graphite surfaces both n-type and p type, so only tier 1 graphite surfaces can replace the original material.
