Designing a Transparent CdIn<sub>2</sub> S<sub>4</sub> /In<sub>2</sub> S<sub>3</sub> Bulk-Heterojunction Photoanode Integrated with a Perovskite Solar Cell for Unbiased Water Splitting.
basic_science · Level V
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- Record sourced from PubMed, PMID 32567132.
- Also identified by DOI 10.1002/adma.202002893.
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Abstract
The integration of photoelectrochemical photoanodes and solar cells to build an unbiased solar-to-hydrogen (STH) conversion system provides a promising way to solve the energy crisis. The key point is to develop highly transparent photoanodes, while its bulk separation efficiency (η<sub>sep.</sub> ) and surface injection efficiency are as high as possible. To resolve this contradiction, first a novel CdIn<sub>2</sub> S<sub>4</sub> /In<sub>2</sub> S<sub>3</sub> bulk heterojunctions in the interior of nanosheets is designed as a photoanode with high transparency and an ultrahigh η<sub>sep.</sub> up to 90%. Furthermore, decorating the ultrathin amorphous SnO<sub>2</sub> layer by atomic layer deposition, the surface oxygen-evolution kinetics of the photoanode are increased significantly. As a result, the onset potential of the photoanode shifts negatively to 0.02 V vs RHE, and the photocurrent density boosts to 2.98 mA cm<sup>-2</sup> at 1.23 V vs RHE, which is ten times higher than that of pristine CdIn<sub>2</sub> S<sub>4</sub> . Such a high-performance photoanode enables the integrated metal sulfide photoanode-perovskite solar cell system to deliver a STH conversion efficiency of 3.3%.