Journal
ACS APPLIED ENERGY MATERIALS
Volume 3, Issue 3, Pages 2296-2303Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.9b02387
Keywords
Cu(In, Ga)(S, Se)(2) photocathode; surface band bending; perovskite solar cell; solar-to-hydrogen; unassisted solar water splitting
Funding
- Nano-Material Technology Development Program (Green Nano Technology Development Program) through the National Research Foundation (NRF) - the Ministry of Education, Science and Technology [2018M3A7B4065662]
- NRF - Korean Government [NRF-2017M2A2A6A01071012, NRF-2018R1A5A1025594]
- Bio AMP
- Medical Technology Development Program of the NRF - Ministry of Science and ICT [2017M3A9G8083382]
- NRF of Korea - Ministry of Science, ICT [NRF2017R1A4A1015022]
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By introducing ZnS between Cu(In, Ga)(S,Se)(2) (CIGS) and the CdS, we greatly improved the photoelectrochemical (PEC) performance of the CIGS photocathode for hydrogen evolution. Chemical and structural analysis reveals that the enhanced performance is due to additional band bending driven by in-diffusion of Zn into the CIGS and suppression of nonradiative recombination. The improved onset potential of CIGS photocathode was exploited by building a tandem device with a perovskite absorber for bias-free water splitting. A PEC device with a solar-to-hydrogen conversion efficiency exceeding 9% (the highest among PEC cells including a CIGS photocathode) with a stable operation of 6.5 h is demonstrated.
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