Atomically Altered Hematite for Highly Efficient Perovskite Tandem Water‐Splitting Devices

Gurudayal,; John, Rohit Abraham; Boix, Pablo P.; Yi, Chenyi; Shi, Chen; Scott, M. C.; Veldhuis, Sjoerd A.; Minor, Andrew M.; Zakeeruddin, Shaik M.; Wong, Lydia Helena; Grätzel, Michael; Mathews, Nripan

doi:10.1002/cssc.201700159

Atomically Altered Hematite for Highly Efficient Perovskite Tandem Water‐Splitting Devices

Journal Article · Fri May 12 00:00:00 EDT 2017 · ChemSusChem

DOI:https://doi.org/10.1002/cssc.201700159· OSTI ID:1401531

Gurudayal, ^[1]; John, Rohit Abraham ^[1]; Boix, Pablo P. ^[2]; Yi, Chenyi ^[3]; Shi, Chen ^[2]; Scott, M. C. ^[4]; Veldhuis, Sjoerd A. ^[2]; Minor, Andrew M. ^[4]; Zakeeruddin, Shaik M. ^[3]; Wong, Lydia Helena ^[1]; Grätzel, Michael ^[3]; Mathews, Nripan ^[5]

School of Materials Science and Engineering Nanyang Technological University Nanyang Avenue Singapore 639798 Singapore
Energy Research Institute @NTU, ERI@N, Research Techno Plaza, X-Frontier Block, Level 5 50 Nanyang Drive Singapore 637553 Singapore
Laboratory of Photonics and Interfaces, Department of Chemistry and Chemical Engineering Swiss Federal Institute of Technology Station 6 1015 Lausanne Switzerland
Department of Materials Science and Engineering University of California Berkeley CA 94720 USA, National Center for Electron Microscopy, Molecular Foundry, Lawrence, Berkeley National Laboratory Berkeley CA 94720 USA
School of Materials Science and Engineering Nanyang Technological University Nanyang Avenue Singapore 639798 Singapore, Energy Research Institute @NTU, ERI@N, Research Techno Plaza, X-Frontier Block, Level 5 50 Nanyang Drive Singapore 637553 Singapore

Abstract

Photoelectrochemical (PEC) cells are attractive for storing solar energy in chemical bonds through cleaving of water into oxygen and hydrogen. Although hematite (α‐Fe ₂ O ₃ ) is a promising photoanode material owing to its chemical stability, suitable band gap, low cost, and environmental friendliness, its performance is limited by short carrier lifetimes, poor conductivity, and sluggish kinetics leading to low (solar‐to‐hydrogen) STH efficiency. Herein, we combine solution‐based hydrothermal growth and a post‐growth surface exposure through atomic layer deposition (ALD) to show a dramatic enhancement of the efficiency for water photolysis. These modified photoanodes show a high photocurrent of 3.12 mA cm ⁻² at 1.23 V versus RHE, (>5 times higher than Fe ₂ O ₃ ) and a plateau photocurrent of 4.5 mA cm ⁻² at 1.5 V versus RHE. We demonstrate that these photoanodes in tandem with a CH ₃ NH ₃ PbI ₃ perovskite solar cell achieves overall unassisted water splitting with an STH conversion efficiency of 3.4 %, constituting a new benchmark for hematite‐based tandem systems.

View Accepted Manuscript (Publisher)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1401531

Journal Information:: ChemSusChem, Journal Name: ChemSusChem Journal Issue: 11 Vol. 10; ISSN 1864-5631

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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