Sirvi Autor "Alberg, Indrek" järgi

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Absorption Spectroscopy Studies of Silicon Dioxide Nanoparticles and Their Applications in Solar Cells
(Eesti Maaülikool, 2021) Alberg, Indrek; Rauwel, Protima (juhendaja); Rauwel, Erwan Yann (juhendaja); Kumar, Rohit (juhendaja)
Silicon dioxide, or silica (SiO2) is a combination of chemical elements silicon (Si) and oxygen (O2). It is a very widespread material on Earth mainly in form of quartz and silica sand. Silicon dioxide is used in silicon solar cells on pure silicon wafers for surface passivation and antireflection. Surface passivation is a technique for preventing efficiency losses. Silicon dioxide has a bandgap energy from 7.52 to 9.6 eV (electron volt) depending on Si-O-Si bond angle and lengths. The aim of this Bachelor´s thesis is to analyse four different SiO2 nanoparticle samples synthesized at the Institute of Technology under UV-Vis spectrophotometer in order to find most UV and daylight absorption. The simplified model based on Beer-Lambert law was implemented to describe absorption in these silicon dioxide nanoparticle suspensions. As a result, the optical properties of these silicon dioxide nanoparticles were analysed in software named “Origin” and graphs interpreted. Conducted tests results may help to understand these SiO2 samples more.