Energy conversion efficiency×Electrochemistry

Perovskite solar cells have crossed 25 % efficiency at lab scale while electrochemical CO₂ reduction and water-splitting catalysts are maturing in parallel—but the two communities have not yet co-designed integrated systems. The shared vocabulary of voltage, ion transport, and cathode engineering means the technical handshake is imminent: high-voltage perovskite stacks can supply the exact overpotential windows electrochemists need, eliminating the power-electronics layer that currently makes solar-driven electrochemistry uneconomical. A fused 'photovoltaic-electrochemical' sub-field is about to collapse the two pipelines into monolithic solar-to-fuel devices.

The bridge fields—Voltage, Ion, Cathode, Chemical engineering, Carbon fibers, Commercialization—are already shared infrastructure in the literature; they represent a latent highway between the two communities. Twenty-six authors currently publish independently on both sides, suggesting a cohort of scientists who understand both languages and are one incentive (a grant call, a high-profile result) away from writing joint papers. The representative A papers show perovskite cells solving the exact interface and carrier-management problems that limit photoanode performance in photoelectrochemical cells; the B papers show electrocatalysts (Cu for CO₂R, solid-state Li electrolytes) hitting performance ceilings that can only be lifted by better electrical inputs. Field momentum on both sides is high; the absence of co-publication is an arbitrage gap, not a structural barrier.

Research groups with dual competence in thin-film photovoltaics and electrocatalysis—particularly those already working on tandem cell architectures (which require the same interface-engineering toolkit as photoelectrochemical cells)—are best placed. Chemical engineering departments that house both electrochemical reactor design and semiconductor processing will likely publish the first integrated benchmarks. Industrial electrolyzer makers that have begun internalizing renewable-input variability will recognize the value of pairing with high-efficiency, low-cost perovskite front-ends before silicon-PV incumbents do.

A head-to-head systems study comparing (a) a conventional silicon PV + power-electronics + electrolyzer stack versus (b) a monolithically integrated perovskite tandem photoanode directly immersed in or wire-bonded to a CO₂-reduction or water-splitting cathode—measuring not just peak efficiency but stability, levelized cost of hydrogen/syngas, and interface degradation under real solar cycles. The goal is to produce the first apples-to-apples techno-economic comparison that either validates or kills the 'cut out the inverter' thesis, giving the field a clear go/no-go signal.