Dye-Sensitized Solar Cell Technologies

Dye-sensitized solar cells (DSSCs) represent a third-generation photovoltaic technology that mimics natural photosynthesis by using molecular dyes to harvest light and inject electrons into a semiconductor scaffold. A typical device comprises a mesoporous titanium dioxide photoanode coated with a monolayer of light-absorbing sensitiser, a redox electrolyte or solid‐state hole conductor to regenerate the dye, and a counter electrode to complete the circuit. Since their inception in the early 1990s, DSSCs have attracted attention for their low fabrication cost, mechanical flexibility, spectral tunability and strong performance under diffuse and low-light conditions. Ruthenium complexes established early benchmarks for efficiency and stability, while organic and earth-abundant sensitiser families have emerged to address supply and sustainability concerns. Key advances encompass the design of high-voltage photosensitisers, robust solid-state hole transport materials, novel redox couples and scalable deposition techniques. Despite peak efficiencies remaining below those of wafer-based silicon, DSSCs offer unique advantages for building-integrated photovoltaics, indoor and ambient-light energy harvesting, and photoelectrochemical conversion to solar fuels. Ongoing efforts focus on improving long-term stability, enhancing photovoltage and optimising device architectures to enable commercialisation and broaden global adoption for decentralised clean energy applications.

Research from Nature Portfolio

Researchers have engineered a bespoke organic photosensitiser that, when paired with a copper(II/I) redox mediator, delivers an exceptionally high open-circuit voltage of 1.24 V and minimal voltage loss. Co-sensitisation with a complementary dye extends light absorption, yielding a power conversion efficiency of 13.5 % under standard illumination and a record 34.5 % under indoor fluorescent light, rendering the technology well suited to low-power electronics and ambient-light harvesting. In parallel, the development of solid-state DSSCs employing amorphous copper(II/I) hole transport materials infiltrated into a mesoporous TiO₂ scaffold has led to stable devices achieving 11 % efficiency under standard test conditions. These copper-based conductors exhibit rapid hole hopping and excellent pore filling, while ultrafast spectroscopy has elucidated electron-injection and dye-regeneration kinetics essential for optimised device performance.

Dye-Sensitized Solar Cell Technologies publication trend

The graph below shows the total number of articles in dye-sensitized solar cell technologies across all publications each year (not limited to Nature Index journals).

Technical terms

Dye-sensitised solar cell (DSSC): A photovoltaic device in which a molecular dye absorbs light and injects electrons into a semiconductor electrode.

Sensitiser (photosensitiser): A molecule that captures photons and initiates charge separation by transferring electrons to the semiconductor.

Mesoporous TiO₂: A nano-structured titanium dioxide film with high surface area for dye adsorption and electron transport.

Redox couple (electrolyte): A chemical system, often liquid or quasi-solid, that regenerates the oxidised dye by shuttling electrons to the counter electrode.

Open-circuit voltage (Voc): The maximum voltage a solar cell delivers when no current flows; indicative of energy losses in the system.

Power conversion efficiency (PCE): The ratio of electrical power output to incident light power under standard test conditions.

Co-sensitisation: The use of two or more dyes in a single device to broaden the absorption spectrum and improve overall light harvesting.

References

1. A molecular photosensitizer achieves a Voc of 1.24 V enabling highly efficient and stable dye-sensitized solar cells with copper(II/I)-based electrolyte. Nature Communications (2021).
2. 11% efficiency solid-state dye-sensitized solar cells with copper(II/I) hole transport materials. Nature Communications (2017).
3. Perylene‐Based Dyes in Dye‐Sensitized Solar Cells: Structural Development and Synthetic Strategies. Advanced Functional Materials (2024).
4. Advanced research trends in dye-sensitized solar cells. Journal of Materials Chemistry A (2021).
5. Decarbonising electrical grids using photovoltaics with enhanced capacity factors. Energy & Environmental Science (2023).