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首页> 外文期刊>Scientific reports. >Light-trapping and recycling for extraordinary power conversion in ultra-thin gallium-arsenide solar cells
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Light-trapping and recycling for extraordinary power conversion in ultra-thin gallium-arsenide solar cells

机译：光捕获和超薄回收非凡的功率转换砷化镓太阳能电池

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We demonstrate nearly 30% power conversion efficiency in ultra-thin (~200?nm) gallium arsenide photonic crystal solar cells by numerical solution of the coupled electromagnetic Maxwell and semiconductor drift-diffusion equations. Our architecture enables wave-interference-induced solar light trapping in the wavelength range from 300-865?nm, leading to absorption of almost 90% of incoming sunlight. Our optimized design for 200?nm equivalent bulk thickness of GaAs, is a square-lattice, slanted conical-pore photonic crystal (lattice constant 550?nm, pore diameter 600?nm, and pore depth 290?nm), passivated with AlGaAs, deposited on a silver back-reflector, with ITO upper contact and encapsulated with SiO2. Our model includes both radiative and non-radiative recombination of photo-generated charge carriers. When all light from radiative recombination is assumed to escape the structure, a maximum achievable photocurrent density (MAPD) of 27.6?mA/cm(2) is obtained from normally incident AM 1.5 sunlight. For a surface non-radiative recombination velocity of 10(3)?cm/s, this corresponds to a solar power conversion efficiency of 28.3%. When all light from radiative recombination is trapped and reabsorbed (complete photon recycling) the power conversion efficiency increases to 29%. If the surface recombination velocity is reduced to 10?cm/sec, photon recycling is much more effective and the power conversion efficiency reaches 30.6%.
机译：通过耦合电磁麦克风和半导体漂移 - 扩散方程的数值溶液，我们展示了超薄（〜200·nm）镓砷砷化镓光晶太阳能电池的近30％的功率转换效率。我们的体系结构使波干引起的波长范围内的波长范围为300-865？NM，导致吸收近90％的入射阳光。我们的优化设计为200？NM等效的GaAs的批量厚度，是平方晶格，倾斜锥形孔光子晶体（晶格常数550Ω·Nm，孔径600Ω，和孔深度290？Nm），与Algaas钝化，沉积在银背反射器上，用ITO上接触并用SiO 2封装。我们的模型包括光产生电荷载体的辐射和非辐射重组。当假设来自辐射重组的所有光以逸出该结构时，最大可实现的光电流密度（MAPD）为27.6Ωma/ cm（2）是从正常事件的1.5阳光下获得的。对于表面非辐射重组速度为10（3）克/秒，这对应于太阳能转换效率为28.3％。当从辐射重组的所有光被捕获并重新吸收（完全光子回收）时，功率转换效率增加到29％。如果表面重组速度降低到10？cm / sec，光子回收更有效，功率转换效率达到30.6％。

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