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首页> 外文会议>European photovoltaic solar energy conference >SEPARATION OF SIGNALS FROM AMORPHOUS AND MICROCRYSTALLINE PART OF A TANDEM THIN FILM SILICON SOLAR CELL IN FOURIER TRANSFORM PHOTOCURRENT SPECTROSCOPY
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SEPARATION OF SIGNALS FROM AMORPHOUS AND MICROCRYSTALLINE PART OF A TANDEM THIN FILM SILICON SOLAR CELL IN FOURIER TRANSFORM PHOTOCURRENT SPECTROSCOPY

机译：傅立叶变换分光光度法从串联薄膜硅太阳电池非晶和微晶部分分离信号。

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The thin film silicon technology has become one of the most promising branches in the photovoltaicindustry. For its high efficiency, amorphous – microcrystalline silicon tandem cell is also hot candidate for a successfultransfer into industrial production.Recently we have introduced fast and highly sensitive method for the evaluation of the optical absorptioncoefficient of photoconductive thin films [1] and later also for the quality assessment of thin film silicon solar cells [2].High accuracy of this method, Fourier Transform Photocurrent Spectroscopy (FTPS), has also been demonstrated byinterpreting the measured FTPS spectra of solar cells (single or tandem) as the external quantum efficiency data [3].It is well known that growth and properties of absorber layer depend on the preceding layers grown in the cellstructure. Therefore it is necessary to study the absorbers incorporated in the whole solar cell structure. In this case themeasured FTPS spectra are influenced by light scattering, light trapping and absorption in other layers of the multilayerstructure. For tandem structure diagnostics the key issue referred in this contribution is a separation of FTPS signals fromamorphous and microcrystalline part of the tandem structure and their correct interpretation.We utilize similar approach as for the tandem quantum efficiency measurement with various LED light biasing tomake one of the cells more conductive so that the photocurrent is limited by the not-light-biased subcell of the tandem.That method successfully removes the electrical influence of the second cell in the measured spectrum.The successful retrieval of separate cell characteristics requires removing of the optical influence of the rest of thestructure. Mainly the measured spectra of amorphous silicon top cell differ from that one can expect when characterizingthe single cell structure. For an appropriate simulation of the light propagation within the structure and confirmation ofour measuring approach we use the optical model Cell [4]. Moreover, the correctness of the separation process is checkedby comparing the evaluated spectra with the spectra of the two single cells (amorphous and microcrystalline) codepositedwith the each part of the tandem structure.
机译：薄膜硅技术已成为光伏领域最有前途的分支之一 行业。非晶-微晶硅串联电池以其高效率而成为成功的热门候选人 转移到工业生产中。 最近，我们引入了一种快速且高度灵敏的方法来评估光吸收 系数[1]，后来也用于薄膜硅太阳能电池的质量评估[2]。 傅立叶变换光电流光谱法（FTPS）也证明了该方法的高精度。 将测得的太阳能电池的FTPS光谱（单个或串联）解释为外部量子效率数据[3]。 众所周知，吸收层的生长和性能取决于电池中先前生长的层 结构体。因此，有必要研究结合在整个太阳能电池结构中的吸收剂。在这种情况下 测得的FTPS光谱受多层其他层中的光散射，光捕获和吸收影响 结构体。对于串联结构诊断，此贡献中提到的关键问题是将FTPS信号与 串联结构的无定形和微晶部分及其正确解释。 我们采用与串联量子效率测量相似的方法，将各种LED光偏置为 使其中一个电池更具导电性，从而使光电流受到串联的不偏光子电池的限制。 该方法成功地消除了测量光谱中第二个电池的电影响。 成功获取单独的电池特性需要消除其余电池的光学影响。 结构体。主要是非晶硅顶部电池的测量光谱与表征时可以预期的光谱不同 单细胞结构。为了对结构内的光传播进行适当的模拟，并确认 我们的测量方法使用光学模型Cell [4]。此外，检查分离过程的正确性 通过将评估的光谱与共沉积的两个单电池（非晶和微晶）的光谱进行比较 以及串联结构的每个部分。

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