TY - DATA T1 - CuS/CdS Quantum Dot Composite Sensitizer and Its Applications to Various TiO2 Mesoporous Film-Based Solar Cell Devices PY - 2015/07/14 AU - Myoung Kim AU - Altantuya Ochirbat AU - Hyo Joong Lee UR - https://acs.figshare.com/articles/journal_contribution/CuS_CdS_Quantum_Dot_Composite_Sensitizer_and_Its_Applications_to_Various_TiO_sub_2_sub_Mesoporous_Film_Based_Solar_Cell_Devices/2150464 DO - 10.1021/acs.langmuir.5b00324.s001 L4 - https://ndownloader.figshare.com/files/3784315 KW - sensitizing power KW - SILAR KW - CdS QD sensitizers KW - charge transfer KW - circuit voltage KW - nucleation site KW - sulfide anion KW - metal cation KW - light absorption KW - power conversion efficiency KW - polysulfide electrolyte KW - transmission electron microscopy images KW - CdS quantum dots KW - layer adsorption KW - MK KW - FF KW - CuS KW - sensitizing range KW - QD sensitizer KW - 0.65 V KW - sensitizing system KW - optimized ratio KW - Voc decay measurements KW - TiO 2 KW - CdS sensitizer N2 - A nanoscale composite sensitizer composed of CuS and CdS quantum dots (QDs) was prepared by a simple but effective layer-by-layer reaction between a metal cation (Cu2+ or Cd2+) and a sulfide anion (S2–). The as-prepared composite CuS/CdS QD sensitizer displayed an enhanced photon-to-current conversion over the sensitizing range of the visible spectrum compared to the counterpart of the pure CdS sensitizer. At the optimized ratio of the deposited amounts of CuS and CdS, the best CuS/CdS-sensitized mesoporous TiO2 cell with a polysulfide electrolyte showed an overall power conversion efficiency of 3.60% with a short circuit current (Jsc) of 11.77 mA/cm2, an open circuit voltage (Voc) of 0.65 V, and a fill factor (FF) of 0.47. From the transmission electron microscopy images, the initially deposited CuS seemed to take a nucleation site to accumulate more CdS in the later deposition. The kinetic studies by impedance and Voc decay measurements also revealed that the CuS/CdS and CdS QD sensitizers made a similar interface between TiO2 and the electrolyte, but the former had a larger resistance of charge transfer with a longer lifetime of excitons after light absorption than the latter. To enhance the sensitizing power further, a multilayer QD sensitizer of CuS/CdS/CdSe was prepared by successive ionic layer adsorption and reaction (SILAR). This led to the best performance of 4.32% overall power conversion efficiency. Finally, a hybrid sensitizing system of inorganic QD (CuS/CdS) and organic dye (coded MK-2) was tested with a [Co­(bpy)3]2+/3+ redox mediator. The CuS/CdS/MK-2 dye-sensitized cell showed over 3.0% efficiency under the standard illumination condition (1 sun). ER -