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ADVANCED CONCEPTS FOR THIN-FILM POLYCRYSTALLINE-SILICON SOLAR CELLS

机译:薄膜多晶硅硅太阳能电池的高级概念

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Thin-film polycrystalline-silicon (pc-Si) solar cells could lower the price of photovoltaic energy ifsufficiently high efficiencies are obtained. In the framework of the European FP6 project ATHLET, we aredeveloping a pc-Si solar cell technology in which absorber layers are made by the creation of a pc-Si seed layer on aforeign substrate followed by epitaxial thickening. So far, we have reached cell efficiencies of up to 8.0% and Vocvalues of up to 540 mV by using aluminium-induced crystallization in combination with high-temperature chemicalvapor deposition on ceramic alumina substrates. In this paper we address some of the challenges that await us tofurther improve our pc-Si cell efficiency. We tested nanotextured Borofloat and glass-ceramic substrates and foundthem compatible with our intermediate- and high-temperature approaches respectively. We showed that high-qualityAIC layers can be made on TCO-covered glass, which is an important result in view of obtaining cells in superstrateconfiguration. We grew absorber layers by different epitaxial deposition methods and found out that our cellefficiency is mainly limited by the presence of intragrain defects. We obtained cells in superstrate configuration Vocvalues of up to 484 mV. The high current density obtained with our first pc-Si mini-module shows that our approachleads to homogeneous pc-Si layers.
机译:薄膜多晶硅太阳能电池可以降低光伏能源的价格,如果 获得足够高的效率。在欧洲FP6项目ATHLET的框架中,我们 开发pc-Si太阳能电池技术,其中吸收层是通过在硅上形成pc-Si籽晶层而制成的 外来衬底,然后外延增厚。到目前为止,我们已经达到了8.0%的电池效率和Voc的效率 铝诱导的结晶与高温化学药品结合使用,最高可达到540 mV的电压 气相沉积在陶瓷氧化铝基材上。在本文中,我们解决了一些等待我们克服的挑战 进一步提高了我们的pc-Si电池效率。我们测试了纳米纹理的硼浮法和玻璃陶瓷基材,发现 它们分别与我们的中温和高温方法兼容。我们证明了高质量 可以在覆盖有TCO的玻璃上制造AIC层,这对于获得上覆层中的细胞而言是重要的结果 配置。我们通过不同的外延沉积方法生长了吸收层,发现我们的电池 效率主要受晶粒内缺陷的存在限制。我们获得了上层结构Voc的电池 值高达484 mV。用我们的第一个pc-Si微型模块获得的高电流密度表明我们的方法 导致均匀的pc-Si层。

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