Resistive and thermal scale effects for Cu(In, Ga)Se2 polycrystalline thin film microcells under concentration
Resistive and thermal scale effects for Cu(In, Ga)Se2 polycrystalline thin film microcells under concentration
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浓度下 Cu(In, Ga)Se2 多晶薄膜微电池的电阻和热尺度效应
DOI：
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发表时间：
2011
期刊：
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通讯作者：
D. Lincot
中科院分区：
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作者：
M. Paire;A. Shams;L. Lombez;N. Péré;S. Collin;J. Pelouard;J. Guillemoles;D. Lincot
众所周知，在集中照明下使用太阳能电池可以提高转换效率，同时减少活性面积，从而减少材料消耗。最近的聚光池设计倾向于采用较小的设备，横向范围在 0.5-1 毫米，由于具有更高的表面积与体积比，因此可以实现更好的散热。如果细胞尺寸进一步减小到微米范围，则扩散阻力损失可以变得非常小。这对于薄膜技术来说尤其有趣，由于窗口层的电阻损耗过多以及玻璃基板上生长的电池的热管理困难，薄膜技术迄今为止仅限于非常低的浓度（1-10 个太阳）。为了证明高注入机制可以在多晶薄膜太阳能电池上实现，我们制造了直径从7μm到150μm的Cu（In，Ga）Se2（CIGS）薄膜微电池，并在集中照明下对其进行了表征。在 120 个太阳照射下，绝对效率提高了 4%，并且可以测量高达 100 A cm−2 的电流密度，而不影响电池性能。微电池在高通量下的温度升高显着降低：直径小于 50 μm 的微电池在 1000 个太阳照射下温度升高低于 20 K。这些结果表明，在高浓度下使用多晶薄膜确实是可能的，具有重要的技术后果。
Using solar cells under concentrated illumination is known to improve the conversion efficiency while diminishing the active area, and thus material consumption. Recent concentrator cell designs tend to go to smaller devices, in the 0.5–1mm lateral range, enabling a better thermal evacuation due to higher surface to volume ratio. If the cell size is further reduced to the micrometric range, spreading resistance losses can be made vanishingly small. This is particularly interesting for thin film technology which has been limited up to now to very low concentrations, 1–10 suns, due to excessive resistive losses of the window layer and difficult thermal management of the cells, grown on glass substrates. In order to prove that high injection regime can be implemented on polycrystalline thin film solar cells, we fabricated Cu(In, Ga)Se2 (CIGS) thin film microcells with diameter from 7 μm to 150 μm, and characterized them under concentrated illumination. A 4% absolute efficiency increase is obtained at 120 suns, and current densities as high as 100 A cm−2 can be measured, without affecting the cell performances. The temperature increase under high fluxes is drastically reduced in microcells: less than 20 K at 1000 suns for microcells under 50 μm in diameter. These results show that the use of polycrystalline thin films under high concentration is indeed possible, with important technological consequences.