Journal
NANO ENERGY
Volume 76, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2020.105089
Keywords
Tandem system; Optical loss; Thin film hematite; Perovskite; Unbiased solar-driven water splitting; Controlled dopability
Categories
Funding
- National Research Foundation of Korea (NRF) [NRF-2019M1A2A2065612, NRF-2020R1A2C2014050]
- NRF - Korea government (MSIT) [2019M1A2A2065614]
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A tandem system consisting of a combined hematite photoanode/perovskite solar cell is a novel configuration enabling unbiased solar-driven water splitting in a cost-efficient way. However, similar light absorption spectrums between hematite and perovskite, causing significant optical loss of the solar cell located behind the photoelectrochemical cell, have been a critical issue, resulting in a substantial reduction in the overall photoelectrochemical performance in the bias-free tandem system. Herein, we report an efficient thin film hematite/perovskite tandem cell optimized with consideration of both quantum efficiency of the hematite photoanode and optical loss of the solar cell. Ti,Si co-doping with controlled dopability and deposition of transparent NiFeOx co-catalyst on hematite (NiFeOx@Ti:Si-Fe2O3(t)) allowed for highly improved surface reaction kinetics and charge transport behaviors, endowing our thin film with state-of-the-art performance among thin film hematite photoanodes reported to date, with a photocurrent density of 2.62mAcm(-2) at 1.23V(RHE) and an onset potential of 0.71V. The perovskite solar cell in the thin hematite/solar cell exhibited an anodic shift of V-oc from 1.08V to 1.16V and a three-fold increased photocurrent density (15.5mAcm(-2)) compared to the solar cell of the conventional thick hematite/solar cell system. The assembled dual photoanodes (dual NiFeOx@Ti:Si-Fe2O3) reached a maximum photocurrent density of 4.0mAcm(-2) at 1.23V(RHE). Our tandem photoelectrochemical system comprising assembled dual thin film NiFeOx@Ti:Si-Fe2O3/solar cell showed outstanding performance of an unbiased solar-to-hydrogen (STH) conversion efficiency of 4.49%, which is the highest recorded value in the hematite/perovskite tandem cell systems. This work provides a great potential for further development of an unassisted solar water splitting system with the thin film hematite.
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