Photovoltaic Efficiency Enhancement in Solar Cell Technologies

Recent advances in solar cell research have centred on pushing the power conversion efficiency of devices closer to their theoretical limits while ensuring long-term stability and manufacturability. In crystalline silicon cells, this has involved optimising wafer thickness and surface recombination via advanced light trapping schemes, such as photonic structures and anti-reflection coatings, to reconcile the competing demands of optical absorption and carrier collection. Perovskite solar cells have seen rapid efficiency gains through compositional tuning to approach the ideal bandgap, as well as the integration of nanophotonic elements that extend the absorption edge and reinforce ultraviolet protection. Multi-junction tandems combining perovskite with silicon or other absorber layers aim to overcome single-junction limits by harvesting a broader portion of the solar spectrum. Concurrently, scalable fabrication methods—ranging from roll-to-roll nanostructuring to simple quasi-random gratings—are being developed to translate laboratory breakthroughs into industrially viable modules. Across all material systems, strategies such as luminescent down-shifting, resonant light-trapping and surface passivation have emerged as key tools to enhance photocurrent, suppress non-radiative losses and improve operational stability, underscoring the global drive towards more efficient, cost-effective and durable photovoltaic solutions.

Research from Nature Portfolio

Recent studies have demonstrated that coupling perovskite layers with guided-mode resonances can produce giant absorption enhancements at the band edge. By engineering multiple momentum-matched resonances through Brillouin-zone folding, absorption coefficients are effectively increased over an extended spectral window, yielding an external quantum efficiency plateau above 93 % and a current boost comparable to the best single-crystal devices. This nanophotonic approach breaks the ray-optics limit and points to further gains beyond compositional optimisation. Separately, the roll-to-roll fabrication of regular three-dimensional nanospike arrays on flexible substrates has provided a cost-effective route to high-performance thin-film devices. Precisely controlled nanospike geometry enables systematic tuning of optical and electrical responses, leading to efficiency improvements of over 40 % in amorphous silicon prototypes and demonstration of large-area flexible panels, thereby establishing practical design guidelines for scalable nanostructured photovoltaics.

Photovoltaic Efficiency Enhancement in Solar Cell Technologies publication trend

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

Technical terms

Shockley–Queisser limit: The maximum theoretical efficiency of a single-junction solar cell under standard illumination, determined by detailed balance between radiative recombination and photon absorption.

External quantum efficiency (EQE): The ratio of collected charge carriers to incident photons at a given wavelength, reflecting the cell’s spectral response.

Light trapping: Optical strategies that increase the effective path length of photons within the absorber layer, enhancing absorption without increasing thickness.

Luminescent down-shifting: The conversion of high-energy (e.g. ultraviolet) photons into lower-energy photons that better match the solar cell’s absorption spectrum, thereby reducing degradation and boosting current.

Guided-mode resonance: A nanophotonic effect in which periodic structures couple incident light into waveguided modes, producing sharp absorption peaks near the material’s band edge.

Photonic crystal: A periodic optical nanostructure that manipulates the propagation of light, used to tailor the spectral and angular absorption properties of solar cells.

References

1. Resonant perovskite solar cells with extended band edge. Nature Communications (2023).
2. Roll-to-roll fabrication of large scale and regular arrays of three-dimensional nanospikes for high efficiency and flexible photovoltaics. Scientific Reports (2014).
3. Perovskite/Silicon Tandem Solar Cells: From Detailed Balance Limit Calculations to Photon Management. Nano-Micro Letters (2019).
4. Silicon solar cells: toward the efficiency limits. Advances in Physics X (2018).
5. Light trapping in solar cells: simple design rules to maximize absorption. Optica (2020).