Electrodeposition of Cu2S nanoparticles on fluorine-doped tin oxide for efficient counter electrode of quantum-dot-sensitized solar cells

• Published in: Journal of industrial and engineering chemistry (Seoul, Korea) Vol. 62; pp. 185 - 191
• Main Authors: Wang, Jia, Rahman, Md. Mahbubur, Ge, Chuangye, Lee, Jae-Joon
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 25.06.2018; 한국공업화학회
• Subjects: Copper(I) sulfide; Counter electrodes; Electrocatalytic; Electrodeposition; Quantum-dot sensitized solar cells; 화학공학; Electrodeposition; Electrocatalytic; Copper(I) sulfide; Counter electrodes; Quantum-dot sensitized solar cells
• ISSN: 1226-086X; 1876-794X
• DOI: 10.1016/j.jiec.2017.12.056

[Display omitted] •Cu2S was electrodeposited onto FTO by a single-step potentiostatic method.•The Cu2S–CE showed excellent catalytic activity for the reduction of Sn2−.•This Cu2S–CE based QDSSC outperformed the PV performance of a Pt–CE based QDSSC.•A maximum PCE of 4.24% was attained in a CdS/PbS/ZnS QD-sensitized cell. This study demonstrated a single-step potentiostatic method for the electrodeposition of copper (I) sulfide (Cu2S) nanoparticles onto fluorine-doped tin oxide (FTO) electrode from an aqueous solution of CuCl2 and thiourea (TU) to develop counter electrodes (CEs) for quantum-dot sensitized solar cells (QDSSCs). The homogeneously distributed and optimized Cu2S–CE exhibited an improved catalytic activity in the reduction of polysulfide (S2−/Sn2−) electrolyte, which resulted in a power conversion efficiency (PCE) of 4.24% with a short-circuit current density (Jsc), open-circuit voltage (Voc), and fill factor (FF) of 19.60mA/cm2, 0.445V, and 48.62%, respectively, for PbS/CdS/ZnS QDs sensitized QDSSCs, while the Pt counterpart exhibited a PCE of 1.17%. The superior photovoltaic performance of this Cu2S–CEs based QDSSC compared to the Pt counterpart is due to its greater electrocatalytic activity and lower charge transfer resistance (RCT) at the Cu2S–CEs/(S2−/Sn2−) interface. This strategy provides an effective, low-cost, and non-Pt electrode for QDSSCs, which is promising for other electrochemical applications.