Solar hydrogen production using epitaxial SrTiO3 on a GaAs photovoltaic
نویسندگان
چکیده
We demonstrate an oxide-stabilized III–V photoelectrode architecture for solar fuel production from water in neutral pH. For this tunable architecture we demonstrate 100% Faradaic efficiency for hydrogen evolution, and incident photon-to-current efficiencies (IPCE) exceeding 50%. High IPCE for hydrogen evolution is a consequence of the low-loss interface achieved via epitaxial growth of a thin oxide on a GaAs solar cell. Developing optimal energetic alignment across the interfaces of the photoelectrode using well-established III–V technology is key to obtaining high performance. This advance constitutes a critical milestone towards efficient, unassisted fuel production from solar energy.
منابع مشابه
lnGaP/GaAs/Ge MULTI-JUNCTION SOLAR CELL EFFICIENCY IMPROVEMENTS USING EPITAXIAL GERMANIUM
Triple junction lnGaP/GaAs/Ge solar cells are highly current mismatched due to the excess current generating capability of the germanium subcell. This severe current mismatch invites new approaches for increasing performance beyond that of current triple junctions: Presented here are two approaches for improving the efficiency of III-V multi-junctions beyond that of current triple junction tech...
متن کاملA silicon-based photocathode for water reduction with an epitaxial SrTiO3 protection layer and a nanostructured catalyst.
The rapidly increasing global demand for energy combined with the environmental impact of fossil fuels has spurred the search for alternative sources of clean energy. One promising approach is to convert solar energy into hydrogen fuel using photoelectrochemical cells. However, the semiconducting photoelectrodes used in these cells typically have low efficiencies and/or stabilities. Here we sho...
متن کاملA silicon-based photocathode for water reduction with an epitaxial SrTiO<sub>3</sub> protection layer and a nanostructured catalyst
The rapidly increasing global demand for energy combined with the environmental impact of fossil fuels has spurred the search for alternative sources of clean energy. One promising approach is to convert solar energy into hydrogen fuel using photoelectrochemical cells. However, the semiconducting photoelectrodes used in these cells typically have low efficiencies and/or stabilities. Here we sho...
متن کاملEconomical GaAs Solar Cells by Epitaxial Lift-Off and Substrate Reuse
Solar power presents the opportunity for a revolution in worldwide energy generation. However, photovoltaics have yet to be the source of more than 0.1% of the energy generated worldwide. Our research is centered on developing technologies aimed at decreasing the cost/power output of III-V group photovoltaic cells. III-V photovoltaic devices consistently rank as some of the highest in efficienc...
متن کاملEnhancing Efficiency of Two-bond Solar Cells Based on GaAs/InGaP
Multi-junction solar cells play a crucial role in the ConcentratedPhotovoltaic (CPV) Systems. Recent developments in CPV concerning high powerproduction and cost effective-ness along with better efficiency are due to theadvancements in multi-junction cells. This paper presents a simulation model of thegeneralized Multi-junction solar cell and introduces a two-bond solar ...
متن کامل