Precise investigation of the light-saturated defect density in amorphous silicon very thin films and solar cells

J. Kǒcka, M. Vaněček, P. Machácek, A. Fejfar, E. Šípek, Ho-The-Ha, I. Pelant, J. Frič, J. Rosa, Z. Remeš, A. Poruba, M. Konagai, W. Kusian
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Abstract

The authors present progress in the three regions important for optimization of the highest long term a-Si:H solar cells efficiency: (1) in order to achieve light saturated state rapidly and controllably a new method of the accelerated degradation by combined AM1 and pulsed ruby laser illumination is proposed; (2) diagnostic of the degraded state is then made possible by a new constant photocurrent method setup combining standard and transmission modes which gives absorption coefficient a in the absolute units and undisturbed by interferences; (3) the possibility to measure deep defect density of states directly on a-Si:H solar cells by space-charge-limited-current time-of-flight is demonstrated.
非晶硅极薄膜和太阳能电池中光饱和缺陷密度的精确研究
作者在优化a- si:H太阳能电池最高长期效率的三个重要领域取得了进展:(1)为了快速可控地达到光饱和状态,提出了一种AM1和脉冲红宝石激光联合照射加速降解的新方法;(2)利用一种结合标准模式和透射模式的新型恒光电流方法,可以得到吸收系数a的绝对单位,并且不受干扰;(3)论证了利用空间电荷限流飞行时间直接测量a-Si:H太阳能电池深层缺陷密度的可能性。
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