The stability improvement of photoelectrochemical solar cells with Bi2S3 quantum dots sensitized photoanodes

Bi2S3, Bi2MoO6 and TiO2 composite photoanodes were fabricated using three different preparation routes to improve its photoelectrochemical (PEC) stability. The microstructure of three photoanodes are distinct significantly according to the results of XRD, SEM and TEM. The ordered TiO2 nanorod arrays (NRAs) and thinner Bi2MoO6 sheet crystals in flower-ball structure facilitate carrier transport and suppresses electron-hole recombination efficiently. The results of PEC tests indicate that the photoanode with Bi2MoO6 sheet crystals in flower-ball structure and TiO2 NRAs shows significant enhancement in PEC performance stability due to its ordered microstructure facilitating carrier transport and transfer and also good adherence of photoanode layer on FTO glass substrate. This photoanode in Bi2S3 quantum dots/Bi2MoO6@TiO2 NRAs structure exhibits satisfactory properties, achieving a PEC stability of 86.41% after 48 h.