9:15 AM - 9:30 AM
▼ [10a-Z11-4] Eco-friendly AgBiS2 Nanocrystal / ZnO Nanowire Heterojunction Solar Cells with Enhanced Carrier Collection
Keywords:solar cell, eco-friendly quantum dot, ZnO nanowire
Solution-process compatibility and size-dependent bandgap tunability of colloidal quantum dots (CQDs) make them low-cost promising materials for next generation solar cells. Among CQD-based solar cells, devices formed with PbS CQDs and ZnO exhibit impressive performance. However, researches of eco-friendly CQDs-based solar cell are still limited. AgBiS2 colloidal nanocrystals (NCs) with a wide absorption band (0.4-1.2 μm) are one of the alternatives to PbS CQDs. However, the power conversion efficiencies (PCEs) of planar-type solar cells using AgBiS2 NCs (ITO / ZnO dense layer / AgBiS2 NC layer/ hole transport layers (eg. PTB7:MoOx) / Ag) have been at most approximately 6% mainly due to the short carrier diffusion length of AgBiS2[1]. In this work, we paid attention to nanowire (NW) structures, with the aim of elongation of carrier diffusion length, and we also applied widely used and less-expensive hole transport materials. We then fabricated NW-type solar cells (ITO / ZnO NW: AgBiS2 mixture / AgBiS2 overlayer / P3HT / Au) by using different ZnO NW lengths and the overlayer thicknesses to study charge collection in AgBiS2 NW-type solar cells (NWSCs). ZnO NWs were synthesized by a hydrothermal method, and the length of ZnO NW was controlled by the reaction time [2].