Energy spectroscopy of electrons in conduction band of solar cell materials based on quantum structure

在中间带太阳能电池中，通过使用低能量光子经由中间带有效地激发电子以实现高转换效率。超晶格的能带是中间带的候选者。在本研究中，我们测量了超晶格太阳能电池中可见光激发的电子的能谱。首先建立了由角分辨光电子能谱仪、NEA制备室和钛宝石激光器组成的实验装置。接下来，我们成功地测量了由于超晶格结构的迷你带的能量色散。

In intermediate-band solar cells, electrons are efficiently excited via the intermediate band by using low energy photons to achieve high conversion efficiency. Mini-bands due to superlattice is a candidate of the intermediate-band. In this study, we measured the energy spectra of electrons excited by visible-light in the mini-bands of superlattice solar cells. Firstly we established the equipment that consists of angle-resolved photo-emission electron spectroscopy, NEA preparation chamber and Ti-Sapphire laser. Next, we successfully measured the energy dispersion of the mini-bands due to superlattice structure.