Electronic device, electrode system and preparation method of germanium selenide-based solar water splitting for hydrogen production

Abstract

The invention discloses a germanium selenide based electronic device capable of decomposing water to produce hydrogen gas by means of sunlight, and a preparation method thereof. The device comprises asubstrate, a back electrode layer positioned on the substrate, a germanium selenide absorption layer positioned on the electrode layer, a buffer layer positioned on the germanium selenide absorptionlayer, a protection layer positioned on the buffer layer and metal nanoparticles attached to the protection layer, thereby realizing efficient decomposition of water to produce hydrogen gas under theapplied bias. By utilizing the characteristics of germanium selenide that an energy gap and a solar spectrum are very matched (1.15eV), the optical absorption coefficient is large, the raw material ischeap and nontoxic and the growth temperature is low, the germanium selenide is designed into an absorption layer material for the first time so as to be applied to the device capable of decomposingwater to produce hydrogen gas by means of sunlight, thereby preparing the germanium selenide based device capable of decomposing water to produce hydrogen gas by means of sunlight. The efficiency fordecomposing water to produce hydrogen gas under illumination by the device exceeds 1%.

Description

technical field [0001] The invention relates to the field of photo-splitting water, in particular to a germanium selenide-based solar photo-splitting water hydrogen production electronic device, an electrode system and a preparation method thereof. Background technique [0002] In a contemporary society where traditional fossil fuels are being depleted day by day, energy issues have become one of the most severe challenges facing human development. As a clean energy, hydrogen has a calorific value 2.7 times that of gasoline of the same quality, and is considered to be the most likely fuel to solve the energy crisis. Hydrogen production by photo-splitting water is a very effective and promising method for hydrogen production. Currently, semiconductor thin films made by utilizing the characteristics of semiconductors with narrow band gaps to absorb sunlight energy can achieve efficient hydrogen production by solar photo-splitting water under an applied bias voltage. . For ex...

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Problems solved by technology

However, since this type of semiconductor is a multi-component system, the thermodynamic stability range is small, and the control of film components and lattice defects is too complicated, resulting in too many impurities and defects in the material, and it is difficult to further improve the actual efficiency.

Another example is the current popular perovskite solar cell, although its photoelectric conversion efficiency has reached 17.9%, but because its light-absorbing material contains toxic elements and is soluble in water, it cannot be used for sunlight decomposition of water to produce hydrogen

And the cheap raw material Cu 2 O is also difficult to be an ideal photo-splitting water hydrogen production material due to its large band gap (2.17eV) and low theoretical photoelectric conversion efficiency.

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