A Bottom‐Up Approach toward All‐Solution‐Processed High‐Efficiency Cu(In,Ga)S2 Photocathodes for Solar Water Splitting

摘要: The development of solution-processable routes to prepare efficient photoelectrodes for water splitting is highly desirable reduce manufacturing costs. Recently, sulfide chalcopyrites (Cu(In,Ga)S-2) have attracted attention as photocathodes hydrogen evolution owing their outstanding optoelectronic properties and band gap-wider than selenide counterparts-which can potentially increase the attainable photovoltage. A straightforward all-solution-processable approach fabrication based on Cu(In,Ga)S-2 reported first time. It demonstrated that semiconductor nanocrystals be successfully employed building blocks phase-pure microcrystalline thin films by incorporating different additives (Sb, Bi, Mg) promote coalescence during annealing. Importantly, grain size directly correlated improved charge transport Sb Bi additives, but it shown secondary effects detrimental performance even with large grains (for Mg). For optimized electrodes, sequential deposition layers n-type CdS TiO2 solution-based methods, platinum an electrocatalyst, leads stable photocurrents saturating at 8.0 mA cm(-2) onsetting similar 0.6 V versus RHE under AM 1.5G illumination CuInS2 films. Electrodes prepared our method rival state-of-the-art these materials.