Synthesis and Characterization of Type II core/shell Nanocrystals for Quantum-Dot-Sensitized Solar Cells

Abstract

In these work, type-II ZnSe/CdS core/shell nanocrystals (quantum dots, QDs) are explored as sensitizers for Quantum-Dot-Sensitized Solar Cells. Type-II ZnSe/CdS QDs synthesized by hot injection method offered low-cost and mono-dispersed QDs. Type-II QDs were expected to have the special electron-hole pair separation character as sensitizers in QDSSCs that are fundamentally different from the type-I QDs. Among their advantages is the broad absorption range in the solar irradiation spectrum and efficient carrier extraction. The result shows that multicomponent type-II ZnSe/CdS Core/Shell QDSSCs reach to higher Jsc value (3.49 mAcm-2) than Jsc value (2.6 mAcm-2) of single component CdSe QDSSCs. For the counter electrode of QDSSCs, Cu2S nanocrystals were applied to improve the catalytic activity. I also reported characteristic of Sb2S3 which is promising sensitizer materials for QDSSCs. Colloidal amorphous Sb2S3 nanoparticles were synthesized and transition to crystal were obtained after annealing process. FeS2 are also potential materials for photovoltaic materials. FeS2 NCs were synthesized by hot injection method and nanoparticles were obtained with a diameter of ~2 nm and UV-Vis-NIR absorption of FeS2 NCs shows a wide absorption up to 1400nm. ⓒ 2015 DGIST