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A sulfide/polysulfide-based ionic liquid electrolyte for quantum dot-sensitized solar cells.

Vasko Jovanovski¹, Victoria González-Pedro, Sixto Giménez

¹CIDETEC-IK4, Paseo Miramón 196, 20009 Donostia/San Sebastian, Spain.

Journal of the American Chemical Society

|November 24, 2011

Summary

Researchers developed a stable S(2-)/S(n)(2-) electrolyte for quantum dot-sensitized solar cells (QDSCs). This advancement improves device lifetime and photoanode stability, crucial for future QDSC development.

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Area of Science:

Materials Science
Renewable Energy
Electrochemistry

Background:

Quantum dot-sensitized solar cells (QDSCs) require improved long-term stability alongside increased photovoltaic (PV) conversion efficiency.
Current QDSC technology faces challenges related to electrolyte stability and device longevity.

Purpose of the Study:

To develop a robust S(2-)/S(n)(2-) electrolyte compatible with Cadmium Selenide (CdSe) quantum dots for sensitized solar cells.
To enhance the efficiency and long-term stability of QDSCs.

Main Methods:

Design and synthesis of a novel pyrrolidinium ionic liquid electrolyte.
Fabrication of QDSCs using CdSe quantum dots and the developed electrolyte.
Performance characterization under standard illumination (AM 1.5G) and stability testing over 240 hours.

Main Results:

The new electrolyte achieved a power conversion efficiency (PCE) of 1.86%.
A high short-circuit current (Jsc) of approximately 14 mA·cm(-2) was recorded.
The device demonstrated improved lifetime with good photoanode stability exceeding 240 hours.

Conclusions:

The developed S(2-)/S(n)(2-) electrolyte offers a robust solution for enhancing QDSC stability and performance.
Limitations identified include poor counter electrode catalysis and high recombination rates.
Further optimization of these factors within the robust electrolyte framework holds significant potential for advancing QDSC technology.