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Updated: Jun 19, 2026
Close-Space Sublimation-Deposited Ultra-Thin CdSeTe/CdTe Solar Cells for Enhanced Short-Circuit Current Density and Photoluminescence
Published on: March 6, 2020
Efficient CdSe quantum dot-sensitized solar cells prepared by an improved successive ionic layer adsorption and
Hyojoong Lee1, Mingkui Wang, Peter Chen
1Laboratory for Photonics and Interfaces, Institute of Chemical Sciences and Engineering, School of Basic Sciences, Swiss Federal Institute of Technology, CH-1015 Lausanne, Switzerland. hyojoong.lee@epfl.ch
Researchers developed a new method for creating efficient quantum dot (QD)-sensitized solar cells using cadmium selenide (CdSe) QDs on titanium dioxide (TiO2) mesoporous photoanodes. This advancement achieved over 4% efficiency in regenerative photoelectrochemical cells.
Area of Science:
- Materials Science
- Nanotechnology
- Renewable Energy
Background:
- Quantum dot (QD)-sensitized solar cells (QDSSCs) are promising for efficient solar energy conversion.
- Mesoporous titanium dioxide (TiO2) photoanodes are crucial components in QDSSCs.
- Controlling QD size, density, and deposition is key to optimizing solar cell performance.
Purpose of the Study:
- To develop an efficient method for preparing QD-sensitized TiO2 photoanodes.
- To optimize QD deposition for enhanced solar cell performance.
- To investigate the impact of CdTe passivation on QDSSC efficiency.
Main Methods:
- Developed a new selenide (Se2-) preparation procedure for in situ CdSe QD deposition.
- Utilized the successive ionic layer adsorption and reaction (SILAR) process for QD deposition on TiO2.
- Fabricated regenerative photoelectrochemical cells using a cobalt redox couple and CdTe passivation.
Main Results:
- Achieved over 4% overall efficiency in QD-sensitized solar cells with CdTe passivation.
- Controlled CdSe QD size and density by varying the number of SILAR cycles.
- CdTe-terminated CdSe QD cells demonstrated superior charge-collection and kinetic parameters compared to CdSe QD cells.
Conclusions:
- The developed SILAR method enables controlled deposition of CdSe QDs on TiO2 mesoporous photoanodes.
- CdTe passivation significantly enhances the performance of QD-sensitized solar cells.
- Promising efficiencies were observed in both regenerative and all-solid-state hybrid solar cells.
