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The Third Generation Solar Cells

Author: Source: Datetime: 2016-09-21 10:08:31
In the solar power portable generator of photovoltaic solar cells for the development process of partitioning method is generally accepted that "three generations of solar cells", ie the first generation of bulk silicon solar cells (single crystal silicon wafer, Polycrystalline wafer-based), the second generation of the foreign substrate the thin film solar cells (for example, polycrystalline silicon thin film solar cells on glass substrates) and third-generation high efficiency solar cells. Bulk silicon solar cell material needs to limit the potential cost reduction, it has long been trying to replace the first-generation thin-film solar cell. Many people had thought that would happen soon the first generation to the second generation cell battery change, but since the first-generation battery market share rapidly expanding technology matures, high conversion efficiency (15% of the level of industrialization), less investment risk and large-scale production due to the economic impact that this change has yet to be achieved.
Improve the conversion efficiency of thin film solar cells is the main problem to be solved. In addition, the performance and stability of thin film battery production costs must also meet the requirements of large-scale applications. Currently in terms of materials, technology and theoretical research, the photoelectric conversion efficiency of solar cells can also be greatly improved, the development of thin-film batteries is also plenty of room for development. To this end, "Zi three generations" photoelectric conversion technology concept came into being, to realize this concept of process methods also become a hot research question.

"Efficiency fc limit" the third portable solar power generation of solar battery is one of the issues to be discussed. Standard single-junction solar power battery several major energy loss process.

The main loss is the process photoexcited electron-hole pair quickly lose more than the band gap energy of redundancy. M can lower photon energy photons in Gao very excited electron-hole pairs generated when the output is equivalent. Only this one loss on conversion efficiency standard battery limitations to around 44%. Another important loss process: photoexcited electron-hole pair recombination.Semiconductor material having suitable properties (especially long life light Son carrier material) carrier recombination loss can be minimized,that is, reduce material defects which eliminates carrier recombination channel. Carrier lifetime inside the battery case depends on the radiative recombination, which is the reverse of the photoexcitation process.
The method of calculation of the early solar maximum energy conversion efficiency is empirical, using standard p-n junction diode theory is based on optimizing value. Today, the most advanced method is to consider the solar cell is forward biased p-n junction light absorption and light excitation balance between reciprocal process.

If the focus sunlight to increase the intensity of the incident surface of the lifePo4 batteries, it can reduce the difference of the band gap corresponding to the width between the voltage and output voltage, that is, increase the output voltage of the battery, thereby increasing the maximum conversion efficiency of the battery. In the next multiple of the maximum focus sunlight (46200 times), the limit conversion efficiency up to 40.7%. But the focus is limited to direct part of the sunlight. After atmospheric scattering of sunlight by light that reaches the Earth's surface may have about 75% of the direct.

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