Aqueous synthesis of AgInS2 and AgInSe2 quantum dots for quantum dots-sensitized solar cell

• Main Authors: Pei-Ni Li, 李貝薿
• Other Authors: Jia-Yaw Chang
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/8b38fu

碩士 === 國立臺灣科技大學 === 化學工程系 === 105 === 　　In this study, we synthesized heavy metal-free AgInS2 (AIS) and AgInSe2 (AISe) quantum dots (QDs) via the microwave-assisted synthetic route within 10 min in an aqueous-phase system. Under microwave irradiation, precursor molecules directly absorb the microwave energy and heats up more efficiently. The synthesis process is simple, rapid and effective without further surface modification of ligand exchange. 　　The quantum dot-sensitized solar cells (QDSSCs) were constructed with QDs and co-adsorbent deposited on TiO2 film. ZnS deposited as passivation layer by successive ionic layer adsorption and reaction (SILAR). Counter electrode made from Cu2S or CuS components assembly with photoelectrode to become the cell component. The performance showed that AIS QDSSC had a power conversion efficiency of 2.72% (Jsc = 9.75 mA/cm2, Voc = 432 mV, FF = 64.6%) under full one sun irradiation (AM 1.5 G, 100 mW/cm2). Further, the performance showed that the GSH-capped AISe QDSSC with TiCl4 treatment exhibited an excellent power conversion efficiency of 5.68% (Jsc = 16.86 mA/cm2, Voc = 664 mV, FF = 50.8%) under full one sun irradiation. This is because GSH-capped AISe QDs allowed for more efficient electron transport and less charge recombination than did the TGA-capped AISe and MPA-capped AISe QDs, as revealed by the electrochemical impedance spectroscopy (EIS) and intensity-modulated photocurrent/photovoltage spectroscopy (IMPS/IMVS) measurements.