Aqueous synthesis of Ga-doped CuInSe2 quantum dots and its application in quantum dots sensitized solar cell

• Main Authors: Shou-Bang Hong, 洪壽邦
• Other Authors: Jia-Yaw Chang
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/za246x

碩士 === 國立臺灣科技大學 === 化學工程系 === 105 === In this study, we demonstrated the synthesis of CuInSe2 (CISe) quantum dots (QDs) by microwave-assisted method in aqueous phase for quantum dots sensitized solar cells (QDSSCs). The CISe QDs were synthesized by the rapid reaction of low-toxic metal precursors and short-chain bi-functional molecules in the absence of organic solvents. Compared to traditional hot-injection and heating-up methods by using of organic solvents, aqueous synthesis has advantages of rapid, simple, and environmentally friendly. This research was divided into two parts. The first part was by adjusting the copper to indium (Cu/In) ratio of CISe QDs to improve the absorption range and modify the internal defects, which effectively enhanced the photoelectric conversion efficiency (PCE) up to 8.24%. The electrochemical impedance spectroscopy (EIS) analysis and intensity modulated photocurrent / photovoltage spectroscopy (IMPS/IMVS) showed the internal electron transfer and impedance of the interface. The second part was by doping gallium (Ga) into different Cu/In ratio of CISe QDs and further boosted the photoelectric conversion efficiency up to 8.68%. Based on our knowledge, this is the best efficiency of QDSSCs in direct aqueous synthesis.