Quantitative optical measurement of chemical potentials in intermediate band solar cells
Quantitative optical measurement of chemical potentials in intermediate band solar cells
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DOI：
10.1117/1.jpe.5.053092
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发表时间：
2015
影响因子：
1.7
通讯作者：
P. Râle;A. Delamarre;G. El-Hajje;R. Tamaki;Kentaroh Watanabe;Y. Shoji;Y. Okada;M. Sugiyama;
中科院分区：
文献类型：
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作者：
P. Râle;A. Delamarre;G. El-Hajje;R. Tamaki;Kentaroh Watanabe;Y. Shoji;Y. Okada;M. Sugiyama;
抽象的。在量子点（QD）、多量子威尔斯（MQW）和高度失配的合金中已经显示出双光子吸收和多带发射过程的一些示范，中间带太阳能电池目前是许多研究的主题。为了更好地理解潜在的机制，我们的目标是实验探测这种设备的多频带操作。我们使用了经校准的高光谱成像仪记录的光致发光，该成像仪在QD和MQW太阳能电池样品的概念验证上提供了空间分辨率为2 μm和光谱分辨率为2 nm的光谱分辨图像。器件发射可用广义普朗克定律描述，由此可以确定三个能带的准费米能级分裂。该技术的优点是，它可以用于研究中间带材料，而不需要制作接触或完整的器件结构。我们还讨论了双光束方法的实用性。
Abstract. Having shown some demonstration of two photon absorption and multiband emission processes in quantum dots (QD), multiquantum wells (MQW), and highly mismatched alloys, intermediate band solar cells are currently the subject of numerous studies. To better understand the underlying mechanisms, our objective is to experimentally probe the multiband operation of this device. We used photoluminescence recorded with a calibrated hyperspectral imager which provides spectrally resolved images with a spatial resolution of 2 μm and spectral resolution of 2 nm on proof of concept QD and MQW solar cells samples. Device emission can be described with the generalized Planck’s law from which the quasi-Fermi level splitting of the three bands can be determined. The advantage of the technique is that it can be used to investigate the intermediate band material without the need to make contacts or a full device structure. We also discuss the usefulness of a dual-beam method.