Solid State Succinonitrile/Sulfide Hole Transport Layer and Carbon Fabric Counter Electrode for a Quantum Dot Solar Cell

Kokal, Ramesh K and Bredar, Alexandria R C and M, Deepa and et al, . (2019) Solid State Succinonitrile/Sulfide Hole Transport Layer and Carbon Fabric Counter Electrode for a Quantum Dot Solar Cell. ACS Applied Nano Materials. ISSN 2574-0970

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Abstract

Solid-state quantum dot solar cell (QDSC) is implemented with cadmium sulfide (CdS) quantum dots (QDs) tethered to titanium oxide (TiO2) as photoanode, carbon fabric (C-fabric) as counter electrode (CE) and a solid electrolyte of succinonitrile/Na2S mixed in a 2:1 molar ratio (SN/S2-) is utilized as the hole transport material. Electron transfer and recombination processes are investigated by intensity modulated photocurrent spectroscopy (IMPS) and intensity modulated photovoltage spectroscopy (IMVS) for a TiO2/CdS/ZnS-SN/S2--C-fabric (solid-state) and TiO2/CdS/ZnS-S2--C-fabric (liquid junction) devices at dif-ferent white light intensities. IMPS and IMVS studies show that the electron transport rate and electron recombination de-crease with an increase in the intensity of light. The champion cell with a TiO2/CdS photoanode and C-fabric as CE delivers a power conversion efficiency (PCE) of 5.2% with a solid electrolyte of SN/S2- and a PCE of 6.3% with is obtained with the liquid aqueous electrolyte of 0.1 M Na2S. Effect of temperature on solar cell performance and the thermal dependence of ionic conductivity for the solid electrolyte are studied in detail. This study shows that the succinonitrile based solid electrolyte is a good substitute for the traditional liquid electrolyte.

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