Related Experiment Video
Updated: Jun 22, 2026
11:26
Integrating a Triplet-triplet Annihilation Up-conversion System to Enhance Dye-sensitized Solar Cell Response to Sub-bandgap Light
Published on: September 12, 2014
Improving the performance of colloidal quantum-dot-sensitized solar cells
Sixto Giménez1, Iván Mora-Seró, Lorena Macor
1Photovoltaic and Optoelectronic Devices Group, Departament de Física, Universitat Jaume I, E-12071 Castelló, Spain.
Nanotechnology
|July 2, 2009
Summary
Quantum dot solar cells using titanium dioxide (TiO2) and cadmium selenide (CdSe) achieved 1.83% efficiency. Performance was limited by charge transfer issues, impacting the fill factor.
Area of Science:
- Materials Science
- Nanotechnology
- Photovoltaics
Background:
- Quantum dot-sensitized solar cells (QDSSCs) offer tunable light absorption.
- Titanium dioxide (TiO2) is a common electron transport material in solar cells.
- Polysulfide electrolytes are used in QDSSCs for redox regeneration.
Purpose of the Study:
- To fabricate and characterize QDSSCs using direct adsorption of CdSe quantum dots onto TiO2.
- To investigate factors influencing QDSSC performance, including TiO2 structure and surface passivation.
- To analyze the limitations affecting the overall efficiency of these solar cells.
Main Methods:
- Direct adsorption of colloidal CdSe quantum dots onto a mesoporous TiO2 structure.
- Utilized a polysulfide redox electrolyte.
- Fabricated solar cells without specific linkers between quantum dots and TiO2.
Main Results:
- Achieved a power conversion efficiency of 1.83% under 1 sun illumination.
- Observed a short-circuit current (Jsc) of 7.13 mA cm(-2) and an open-circuit voltage (Voc) of 0.53 V.
- Identified a low fill factor (0.50) attributed to charge transfer to the electrolyte.
Conclusions:
- Direct adsorption of CdSe quantum dots onto TiO2 is a viable method for QDSSC fabrication.
- Optimizing TiO2 structure, surface passivation, and counter electrodes can enhance QDSSC performance.
- Charge transfer to the aqueous electrolyte is a key limitation for improving the fill factor in these colloidal quantum dot solar cells.
